Wednesday, August 31, 2016

Subwoofer filter using one transistor

Subwoofer filter using one transistor is very very simple for filtering your subwoofer tone control. This circuit diagram for subwoofer filer using one of transistor :
Subwoofer filter using one transistor circuit diagram
Subwoofer filter is using for filtering audio tone signal, subwoofer tone about 40Hz - 100Hz. Input audio is stereo , and output to mono subwoofer output. It' very simple subwoofer filter, you just need a few component resistor and capasitor, and basically strenghening by 1 transistor , the transistor just using C945 ot C828

Component list Subwoofer filter using one transistor :
  • Q1   C945 / C828
  • C1   1 Uf
  • C2   100nf /ceramix104
  • C3   1uf
  • C4   1uf
  • C5   1uf
  • C6   1uf
  • C7   100uf
  • R1   10k
  • R2   47ohm
  • R3   220k/470k
  • R4   10k
  • R5   10k
  • R6   10k
  • R7   1k
  • R8   2k2

Symasym 5.3 Amplifier Sound Best

Symasym 5.3 Amplifier Sound Best
Kit Symasym 5.3 Amplifier Sound Best Assembled with Low Cost, Not a lot of amplifier assemblies that can produce sounds pretty good to use cheap components and easily available in the market. Symasym is appropriate amplifier if you need an amplifier for your home audio system. With a relatively affordable cost. The sound quality was good. In fact, I think special.

To assemble this Symasym 5.3 Right as it is very easy. Because the Internet is widely available and references supporting his review. There already schematics, PCB layout, how to set amplifier, etc. The following URL can be taken into consideration and referral if you want to assemble Symasym amplifier:
Symasym 5.3 Amplifier Sound circuit diagram
symasym5 pcb board

Kit Symasym 5.3 Amplifier Sound circuit diagram

Kit Symasym 5.3 Amplifier Sound circuit diagram

Power Symasym 5.3 with standard components. Tr drivers use TIP41C and 42C.
Symasym 5.3 specs:
  • THD: ~ 0.005% (measured) sim'd: 0.002%
  • Power into 8ohm: 60 watts
  • Into 4ohm Power: 100 watts
  • Gain: 32dB (~ 1: 40) of full output at 0.7v input (0.5v rms)
  • Feedback: 57dB
  • Phase margin:> 90
  • Supply voltage: +/- 36VDC can use 24VAC transformer CT + capacitor enough (2x10.000uF)
  • Biasing: 55ma, 12.1mv
  • Frequency response: 3.2hz to 145khz (-1dB) using input 4.7uF cap
  • Phaseshift at 10khz: 3
Some of the reviews of this amplifier as follows:
MikeB review:
"Symasym absolutely incredible!
Prominent characteristics are the wide dynamics, resulting in a steady bass, deep, and powerful. And special reproductive detailed sound and detailed, without kolorasi sound. Staging her really three-dimensional. Bak enjoy incredible sound stage!
When amps in turn on / off ON / OFF does not cause strange noises like tuk or duk. Really clear silent.
His voice is pleasant enough, there is no excess or false treble, soft but very transparent. All types of music can be played quite nicely by Symasym. "

Friedrich Schmidt / Germany Cnet review:
"The struggle to assemble amplifier for days paid off. When Symasym connected to the soundcard. The voice sounded pure. No excess or less. No matter what kind of music entered into Symasym, always sounds incredible - felt warmer than transistor Symasym / Toshiba. One thing is certain: I GainClone raft before, just counting days to rest. "

1000 Watt Amplifier APEX 2SC5200 2SA1943

Mr. Mile Slavkovic pretty much produced works for the PA or outdoor amplifier that is becoming very popular among DIY audio. That is very popular is the APEX series B500 and H900. This time he displays a class AB power amplifier with 1000 watts power with a large chain of more simple. Simple and similar to the circuit of power amps OCL that we often rafts and many in the market.

1000 Watt Amplifier APEX 2SC5200 2SA1943  Circuit diagram

Power Amplifier BA1200 APEX is quite pretty easily assembled. With over 100 volt PSU suggested using power transistor series MJL21195 MJL21196 ten pairs. But when it is difficult to obtain trasistor then we can still use 2SC5200 2SA1943 which is popularly used in the power amplifier now, of course, by lowering the power supply voltage bit her. Using 10 pairs MJL21195 MJL21196 produce 1200 watts. Was when using 10 pairs of 2SC5200 2SA1943 produce 1000 watts, then who wear toshiba widened Apex series BA1000.

For those of you who are still hesitant to assemble BA1200 should try first version of its low power is APEX BA100. For verily this is a BA-1200 series of high power its BA100.

Tuesday, August 30, 2016

Professional Audio Mixer 8 Channel

Mixer serves as a mixing sound, a mixing console, whether it is analog or digital, or also called a soundboard / mixing desk (soundboard) is an electronic device that functions blends (more popular with the term "mixing"), setting a path (routing) and change the level, as well as the harmonization of the dynamic of the audio signal. Signal - the signal that has been modified and set later corroborated by a final amplifier or power amplifier.

Professional Audio Mixer 8 Channel

Audio mixers are widely used in a variety of purposes, including recording studios, system calls the public (public address) systems, sound reinforcement, broadcasting both radio and television, post-production and film making. An example of a simple application, a musical performance, for example, it is not efficient if we use each amplifier to amplify any part vocal sound good singers and musical instruments played by the accompanying band.

Here Audio mixer will be an important part as a collecting point of each microphone is plugged in, set the size of the sound level so that the sound level good balance of vocal and music will be reached before amplified by an amplifier.

Mixer is one of the most popular devices after the microphone. We know him as a mixer, probably most of us call it that because its function is to mix all incoming voice, then shortly seimbangkannya, making salura two channels (LR if stereo, and one that mono), then send it to the cross-over of new active fed to the power amplifier and the latter to the speakers.

Mixing console receives various sound sources. Can the microphone, musical instrument, CD player, tape deck, or DAT. From here can easily be done setting the input and output levels ranging from very soft to hard. If we suppose an audio system iu suppose that as the human body, snake cable can we assume as the nervous system, and the mixing console as the heart.

8 channel mixer

Product Information

  • This mixer is equipped with 6 potensio which set the tone 3-band (high, middle and low), Effect, Panpot and Level.
  • Using Pre Amp circuit MIC so that the risk of radio interference and vibration gekombang 50 Hz from the power grid for a long mic wiring can be avoided.
  • Already equipped regulator Tape Volume, Send, Delay, Repeat, Master Volume, Headphone Volume and Phantom Switch + indicator.
  • The series has become one effect cho and covet use external sound effects, available sockets send and return.
  • Position the entire pot, socket and stereo led VU display has been arranged in a neat and compact in a single PCB, simplify electronics hobbyists to create their own a professional mixer high quality.

31 Channel Equalizer Behringer Ultragraph FBQ-3102

Yea this is the performance of the Equalizer Behringer  brand with the name Ultragraph FBQ-3102. The appearance of the product is quite elegant with LED lights in every pot sliding. If sound issue equalizer is quite smooth, Unlike with the equalizer Peavey fairly rough,Equalizer is quite easier settings,, For every purchase of the equalizer in include guidebooks to set each frequency.

And there is output to Sub Woofer on rear,, So Can be used for a 2.1 system,, If I put on equalizer is usually I connect that part of sub woofer Out with Power amplifier 1000 watts to push the two pieces of the sub woofer 18 inch, for its part the stereo I sambungin with Power amplifier 1000 watts to push two pieces of Dual Speaker 15 Inches.

31 Channel Equalizer Behringer Ultragraph FBQ-3102

31 Channel Equalizer

Product Features:

  • Professional 31-band stereo graphic equalizer for live and studio applications
  • Revolutionary FBQ Feedback Detection system instantly reveals critical frequencies and can also be used as audio analyzer
  • Dedicated mono subwoofer output with adjustable crossover frequency
  • Additional sweepable high and low-cut filters for each channel remove unwanted frequencies, e.g. floor rumble, hiss etc.
  • Highly accurate 12-segment LED input/output metering and input gain controls for easy level setting
  • Ultra-low noise audio operational amplifiers for highest signal integrity
  • Relay-controlled hard-bypass with an auto-bypass function during power failure (failsafe relay)
  • Servo-balanced inputs and outputs with 1/4" TRS and gold-plated XLR connectors
  • Shielded toroidal power transformer for ultra-low noise performance
  • High-quality components and exceptionally rugged construction ensure long life

Conceived and designed by BEHRINGER German

Circuit Schematic Equalizer 6 Channel TL074

6 channel equalizer circuit schematic TL074 is a voice control with a kind of bar with the sound settings are divided within each frequency in the frequency range of 50 Hz, 90 Hz, 200 Hz, 800 Hz, 3, 2 KHz, 12, 8 KHz. The equalizer circuit scheme in the getting up put on audio operational amplifiers (Op-Amp) separately for each channel.

IC Op-Amp which is used to make a circuit schematic of the channel equalizer 6 which TL074 IC which has good frequency response and low noise. The circuit schematic Equalizer 6 Chanel TL074 is quite simple and can be made by drawing schematics and components as shown in the figure below.
Circuit Schematic Equalizer 6 Chanel TL074
The circuit schematic Equalizer 6 Chanel TL074
Components list Equalizer circuit 6 Chanel TL074
  • Resistor 1 has type or size 47Kohms
  • R2-5-18 have type or size 150Kohms
  • R3-4 have the type or size 10Kohms
  • Resistors 6 Resistor 7, 8 resistors, resistor 9, resistor 10, resistor 11, resistor 12, resistor 13, resistor 14, resistor 15, R16, R17 = 10Kohms
  • R19 has the type or size 100Kohms
  • RV1, RV2, RV3, RV4, RV5, RV6 have type or size 100Kohms Lin.
  • IC1, IC 2 has the type or size TL074
  • Capacitor 1 has type or size 1uF 100V
  • Capacitor 2 has type or size 15nF 100V
  • Capacitor 3 has type or size 150nF 100V
  • Capacitor 4 have type or size 33nF 100V
  • Capacitor 5 have type or size 8. 2NF 100V
  • Capacitor 6 has the type or size of 1nF 100V

3V electronic stun gun circuit

This circuit is a cheap version stun gun circuit that is powered by two AA baterry. The output of this electronic project is about 350V dc. The heart of the circuit is the oscillator that is composed of Windings and transistor.

3V electronic stun gun circuit diagram
3V electronic stun gun circuit
Part List:
  1. Transistor - Tip41 or similar
  2. Resistor - 100-ohms 1W
  3. Capacitor-100nF
  4. C-1.2uF 1000V or any cap with 1000V rating
  5. D-1N4007 diode or similar

3V electronic stun gun circuit
Primary and Feedback winding

3V electronic stun gun circuit
TIP41 pins

Primary winding P is composed of 16 turns of #24 AWG wire, feedback F is composed of 8 turns of #24 AWG wire, and secondary winding S is composed of 270 turns of #30 AWG magnetic wire. P1 is connected to the collector of transistor, F2 to the 100-ohms resistor at transistor base. F1 and P2 to the battery. The output of Sec winding is rectified by Diode Bridge. The output capacitor is an electrolytic type that is rated 400V above. Capacitance of the output capacitor depends on what available on hand, but always keep in mind that the higher the value the better. this simple electronic project is dangerous when accidentally touched, thus avoid holding the output and discharge the capacitor before and after using.
One of the uses of this circuit is the camera flasher circuit. Source

9V to 13.5kV Inverter Circuit

This 9V to 13.5kV Inverter Circuit high voltage source is formed by an inverter, around the transistor, which provides pulses of 150V to the inverter formed by the thyristor and capacitor in series with the transformer 2. This pulse output of 4.5kV to be multiplied with the network so as to achieve the output voltage of 13.5kV.  Neon lamps (marked LN) form the thyristor triggering pulses.

The transformer T1 has a ratio 3000:500 Ω of the type used in audio output transistor. T2 is a transformer flash lamp trigger a secondary 6kV. This inverter circuit requires a 9VDC power supply with current 0.01A

9V to 13.5kV Inverter Circuit

Apply this equipment on the human body can cause serious physical injury to death. Don’t use in humans.

Monday, August 29, 2016

Low Noise Tone Control Circuit

Tone control or pre-amplifier is a circuit of supporting amplifier. Sometimes some of us do not understand where a good amplifier, raft and the result is not much different or even the same. Therefore we must know the character of the advantages and disadvantages of each amplifier equipment.
Low Noise Tone Control Circuit DiagramLow Noise Tone Control Circuit Diagram

Tone control low noise here is not without noise, but most low-noise between the tone control on the market, for example Ronica 4 transistors, TL-084, TC-2 LM833 etc.

Jump to the explanation of each component ...
Potentiometer 1 serves to adjust the intensity / level of the incoming signal is assisted Potentiometer 2 as balance / balancer. 2 pot is still mounted regular and an optional component. R1 is actually a capacitor 1-2uF / 250V branded,
but I prefer to replace it with a resistor 1K / 5% are common for a reason to avoid hum and interference-sensitive. R2 R3 minimize the interruptionw adjusts thhilee impedance OP-amp 1. R4 and R5 serves to raise strengthened by 1.3 times. Pre amplifiers typically use a standard reinforcement by 2 times, but by most of us consider this noise. So I chose a value of 1.3 times, but the most minimal noise from the signal volume is enough to light up the lamp peak.

For low noise ...
The cause nois in Op amp 1, audio apex even eliminate this stage. Can
This step is also used as a buffer (jumper R5), strengthened by 1 times. Lower the value of R5 or increase the value of R4 with consequent gains to be less, but remains at a value above 1 time for input to take the path of non-inverting, so that the signals can and nois reduced. R4 can also be replaced with a 10K trimpot and get into the middle leg adjuster bass circuit (resonant bass).

C1 and C6 as a filter to reduce the treble / high frequency of excessive or often called oscillation prevention. R6 is actually an optional component that little help adjust the system impedances. Ideally R7 together with R8 to facilitate
give the sign value gain on potensio panel tone control. C2 and C3 form a series circuit filter treble (high pass filter), its value is greater then the noise is passed increasingly mid. C4 and C5 assisted by R9 and R10 form a low pass filter (filter bass), the greater the value of C is a bass sound that is passed will be more tender / low (maximum 47nF), the smaller the value of c is the bass signal that is passed will further dip ( dig-dig, c4 = c5 = 22nF). A suitable value for this is 27-33nF and not 47nF (depending on taste). Pot 3 & 4 pot set treble and bass levels, the greater the value of the pot is getting bigger gains (bass & treble included Potentiometer volume). R11 adjust the output impedance, while R12 and red LED as an indicator showing that the peak has been given a full signal amplifier.

Supply 15V maximum. IC can TL074, but in designing a PCB, IC can be
replaced with 2x TL072 / NE5532 / 4558.

Sunday, August 28, 2016

Stereo Speaker Protection

This is the stereo speaker protection circuit, provides stereo speaker protection and prevents switch-on clicks and DC components on the output of the amplifier connected. Stereo Speaker Protection Circuit diagram :Stereo-Speaker-Protection-Circuit
Speaker Protection Components List:

  1. R1,R2 : 3K3
  2. R3,R4,R5,R6,R7 : 8K2
  3. R8,R9,R10,R11 : 330K
  4. R12,R13 : 18K
  5. R14,R15,R16,R17 : 47K
  6. R18 : 47
  7. R19,R20 : 680
  8. R21,R22 : 100K
  9. R23,R24,R25,R26 : 1K2
  10. C1,C2,C3,C4,C5,C6 : 1?F
  11. C7,C8,C9,C10 : 100?F
  12. C11 : 220?F
  13. C12,C13 : 470?F
  14. D1,D2,D3,D4,D5,D6,D7,D8,D9,D10 : 1N4148
  15. D11,D12,D13,D14 : 1N4007
  16. ZD1 : 6V8
  17. T1,T2,T3 : BC547B
  18. T4 : BC517
  20. LD2 : Yellow (WAIT INDICATOR)
  21. RY1,RY2 : VR15M121C (12VDC – 15A – 1C)
  22. Transfo (1,2VA – 2 x 6V / 2 x 0,1A)
  23. IC1 : LM324

Circuit Notes:
This circuit uses center tap transformer and the power supply circuit design already provided in the schematic diagram. It powered with 6V dual polarity power supply.

This circuit available in kits, you may order the kit online. The manual assembly of the kit can be download at the end of this post.

This stereo loudspeaker protection will protect the loudspeakers against the switch-impulsions and the direct current component on the output of the connected amplifier.
Suitable for:

  1. Amplifiers with symmetrical power supply
  2. Amplifiers with asymmetrical power supply.
  3. Specifications :
  4. Switch-delay: 6 seconds
  5. DC protection: +1V/-1V
  6. Max. input voltage: 200Vpp + DC
  7. Max. switching current: 10A
  8. LED indication for: WAIT (switch-on delay) and ERROR (DC on speaker output)
  9. Supply voltage: 220VAC .Read more

New Speaker Portection Circuit using transistor complete part list.
Speaker Portection Circuit using transistor
This additional variable speed fan controller which functions so that the fan rotation slowly during cold power amplifier, and a strong fan rotation while the power to heat.

Inverting amplifier circuit

There are two types of systems namely Strengthening inverting amplifier (inverted) and the non-inverting amplifier. The following discussion of the inverting amplifier.A simple inverting amplifier systems can be implemented with just an Op Amp. For example, as shown below: The picture above is a simple audio amplifier scheme called inverting amplifier, Why? because its output will generate the inverted signal of the input signal.
Inverting amplifier circuit
Certainly would not hear the difference in our ears, but it will be very important to consider if we work with the system BTL (Bridge Transformer Less). * For the BTL system we discussed another time yach *
To amplifier as above, we can easily calculate how much gain. Only by dividing R2 to R1. For example:

The input signal = 100 mV (milli Volt)
R1 = 1Kohm (kilo Ohm)
R2 = 10kOhm

eans the gains is 10 times
So that the output signal generated is 10 x 100mV = 1000mV or 1V
Simple right?
Well, so for the application in the assembly with IC 4558 could be as shown below:
Inverting amplifier circuit diagram

Amplifier Microphone for instance, then you can fill in the value of the following components:
R1 = 1Kohm
R2 = 100kOhm
C1 = 10μF
C2 = 10μF
V + = 12 V Dc
* The circuit above only works with symmetrical power supply system (+ (positive), 0 (ground), and - (negative) *

Saturday, August 27, 2016

Simple Peak Detector Circuit

This circuit is made to indicate that the amplifier has been given the maximum signal, the ability of the amplifier has to be at its peak. if the light is on means the signal-volume do added again.

How it works is the LED lights will light if given a signal that more than 1.8 Volt, the average amplifier will be saturated (maximum) if the signal was given more than this.

The circuit is very simple to the point that we forget that making a series of peak singnal be this way. This circuit is mounted on the output tone control IC, the output master mixer or power amplifier input. This circuit will not overload the circuit to another.

TA8215 Power Amplifier Circuit

The Circuit of 4 channel power amplifier car.A series of power amplifiers for car use TA8215 amplifier IC, which ic has 4 channel output. So it is suitable for use on cars. To output power per channel was approximately 10 Watt. But in the discussion of the power amplifier circuit schematic of this car in the bridge circuit, so be 2 Channel, but the higher power output than the previous which only one channel. Thus requiring two amplifiers IC Ta 8215 to get a 4 channel output.

Here's a circuit schematic 2-channel power amplifier car bridge:

Amplifier voltage is required at a minimum to a maximum of 12VDC and 20VDC.
Power amplifier circuit has been my tests. And get great results, clear and smooth voice is not nasal tone or hum.

Friday, August 26, 2016

Choosing the Right Amplifier for your Car

Finding the best amplifier for your auto sound system can be a lot easier if you take the time ahead of time to learn what you need and what will work best with the sound system you've selected for your car, truck, or SUV. It helps to understand what an amplifier does in order to purchase the one that will best suit your needs. An amplifier takes a small sound, adds a little boost of its own, and then turns it into a big sound. The more power your amplifier has, the better quality of sound it will provide. An underpowered amplifier will have a thin, tinny sound that is rather unattractive in an auto sound system, or any other sound system for that matter.

You should also take care to remember that the power rating of an amplifier is the maximum power it is capable of expending not the amount that it will regularly use. The RMS rating of an amplifier is a good indication of its power output. One thing that is important to remember is that you should never buy an amplifier based on the maximum output or RMS rating. This number is more often than not incredibly misleading. If a driving, thumping bass beat is important to you then you should make sure that your amplifier has a bass boost button. This button will or switch will give a little bit of a boost to your bass. It's something I can pass on by many bass lovers cannot live without. Not all amplifiers have this so choose wisely and according to your preferences.

When it comes to amplifiers there are essentially four major classes (there are other classes but they are not all that common so I will not dwell on defining them) that represent the quality of sound you should expect from the system.

1) A. This class has a great output of quality sound but wastes huge amounts of energy in the process of creating that wonderful sound.

2) B. This class is slightly better than A as far as it wastes less energy and slightly worse as it produces a somewhat inferior quality of sound.

3) A/B. This resembles either A or B as far as sound and energy waste goes depending on the volume. Lower volumes will utilize the class A qualities of the amplifier while louder volumes are more in keeping with class B.

4) D. This class is primarily decent for producing a good bass sound and little else. The quality of sound and amount of energy wasted are both only moderate and neither are very impressive.

Of course this is the bare bones run through of the very basic amplifier basics. Another thing to note is that many people simply refer to amplifiers as amps rather than saying the entire word. It's slang but it's so common that no one will blink if you do it. In fact you are far more likely to get funny looks for calling it an amplifier. Regardless of the small talk an amplifier isn't the end all be all of an auto sound system. It is only important if you feel it is important and many sound systems work splendidly without an extra amplifier to confuse the process and raise the price.

Whenever you decide to buy a new auto sound system for your car, truck, or SUV there is a moment of exhilaration and excitement as this is often a decision you've mulled over for quite a while rather than a spur of the moment decision. This exhilaration is promptly followed by a moment of complete and utter fear, as most of us have no clue what we really need. Hopefully, this has helped you decide whether or not you will need an amplifier and if you will, perhaps you can make a more educated and informed decision as to the type of amp you need.

Complete Home theater set up speakers

Home theaters are getting to be extremely popular among American homes. This modern technology is slowly giving movie theaters a run for their money. Basic knowledge of home theater system and its basic components may be best for people who want to bring home relaxation and entertainment. 

The most important consideration in the design and complete set up of your home theater is the size of the room. The home theater speakers and the other components of your home theater may need to consider the size of the room. Too small rooms for your home theater may not require so many speakers. Only three speakers may be good if the room is quite small. 

Do not overload your small room; you may not be able to get the entertainment and relation you want if you feel overloaded with so many home theater speakers. Because you only need three home theater speakers in your small room, you may need to acquire the high-end brand of home theater speakers to compliment the size of the room and the other equipments for your home theater.

Complete Home theater set up speakers
Complete home theater speaker setup
If you have a bigger room however, the basic three home theater speakers may not be enough. You may need to put up to six speakers around the room, you may also consider complimenting your home theater speakers with subwoofer to complete the surround sound like in movie theaters. In addition to the speakers, you may also need to purchase a high-end television set which should not be smaller than 27 inches. It may not be reasonable if you buy a smaller television set because it may drown in the fineness of your home theater speakers.

Home Theater speaker set up
Additionally, the DVD player needs to be of high quality, having progressive scan your DVD Player may help provide sharp images and flicker-free pictures for your home theater system. The home theater speakers, television and DVD player are the basic components of a home theater system especially if the room is quite small. However, for bigger room, adding home theater furniture and home theater projectors may be necessary to complete the package. Again, it may be worth it, if your home theater speakers are of high quality. This is because of the need to provide a surround sound for the home theater set up. The DVD player and the television set may answer for the requirement of sight in a movie theater setup. Your home theater speaker needs to answer for the sound requirement, and if your home theater speaker is not of high quality brand, it may not be able to do the job for you.

In order for you to avoid making mistakes in your choice of home theater equipments including home theater speakers, and home theater furniture, you may require the services of a home theater designer. They will be able to provide the best recommendation that will ensure you will get the most out of your home theater system including topnotch home theater speakers. Additional home theater furniture may be necessary to complete the package and to dress up the whole room. Since they are the designers, they will be able to recommend the best for your home theater system set up. If you have a properly designed home theater, you will be the best entertainment possible.

Your home theater designer may take on the huge responsibility of choosing the most suitable home theater speaker to attain the best design for your home theater.

Bring home relaxation and entertainment right in your own living room, home theater system can provide this to you and your family.

Crossover types Passive and active

Crossover is a tool that serves to limit the "frequency range" to be received by the speaker. Crossover is used to regulate flow to the tweeter, the midrange, midwoofer, and bass to the subwoofer. There are two kinds of crossover, the crossover passive and active crossover.

how the passive crossover, the type of crossover types, crossover types, the types of rosover
passive crossover 
Passive crossovers work after receiving the output of the amplifier, are ineffective because they are throwing power amplifier, because the passive crossover frequencies have been processed in the "boost" (increase) by the amplifier.

passive crossover
active crossover 
Active crossovers work so signal generated by the head unit (pure signal), dividing it in accordance with the desired frequency boost later in the amplifier, so that the amplifier to work more efficiently, and frequencies produced more organized in accordance with their respective purposes, tweeter, midrange, woofer , subwoofer.

A little short in the use of an active crossover is the use of 12V power, ground, and remote. In theory this could lead to "noise" on the audio system, but do not worry, by the proper installation, and use good quality products will not occur a problem, as in any "competition-level car audio system". If you want to raise just a little audio sound quality, passive crossover is the right choice. But if want the sound quality is really good you should select an active crossover. Active crossovers require special mounting, especially for power cables and ground wires, but the effort is proportional to the quality of music produced. Active Crossover works by "cutting" is not frequency necessary before the "boost" by the amplifier, so the amplifier can focus on the frequency you want to hear, so do not waste energy Power.

Home theater design

Having to be able to bring home entertainment may be a luxury. This is because only very few households can afford home theater system. Of late, only the rich and the famous can afford such luxury. This notion is now a thing of the past. Home theater systems may now be available to greater number of households because of the knowledge of basic home theater design. The basic home theater design may only require three basic components and these three components may already be affordable for the working class.

Home theater design However, before you may need to think of the basic home theater design for your home theater system, you may need to know the size of the room for the home theater set up. The size of the room to where the home theater will be set up will depend on how basic the home theater design needs to be.

Home theater experts recommends that if the room is quite small, all you need for your home theater design is a television set, three speakers and a DVD player. The home theater design may be dependent of the shpre of the room; however, the position of the speakers remains to be the left, the right and the center of the room. Basic home theater design may require a television set bigger than 27 inches. Too small screen for your home theater design may not be sufficient for a movie theater-like experience. 

This is because even for the home theater design, you may need to consider the sight and sound of a movie theater. It is the main consideration why people go to a movie theater, the big screen and the surround sound. With respect to the surround sound of a movie theater, the basic three speakers is only applicable for smaller rooms, if the room is bigger, the home theater design needs to be more than three, you may go up to six speakers and a complimenting subwoofer may be necessary for the surround effect. Going back to a small room, if you will only put three speakers, you may want to consider buying a high quality brand speaker; this will give you enough surround sound for a smaller room. 

If you have a small budget, ensure that the store where you will buy your speakers will allow you to test the product in your room and if it will not give you a good surround sound, they should allow you to return or replace the unit. This is because some speakers sound good in the store but when you finally set them up in a small room, the effect is not very good. Find a neat deal where they can allow you to return or replace the speakers. However, if your budget is sufficient, you may consider hiring the services of a home theater designer. 

Your home theater designer will be able to design the home theater better and with complete accessories. He may require checking the power rating, and the need for amplifiers. He may also recommend using home theater projectors and he may recommend how the speakers need to be. You will get a good home theater design if you will be able to hire home theater designers. The need for home theater seating and television cabinet may also be necessary for the complete package of your home theater.

You may enjoy the entertainment without having to tide traffic jam and enjoy in your own home theater system.