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MOSFET PWM (Pulse Width Modulated) Power Supply
Metal–Oxide–Semiconductor Field-Effect Transistor is a transistor used for amplifying or switching electronic signals. We use it in billions of them. In our computers, our telephones, game consoles, cars, electrical appliances and in this case, our Amplifiers. They are found in systems where information is processed or stored. A MOSFET is basically an electrical switch that allows the flow of electrical current. An electrical switch has two possible states, ON or OFF. This is where the MOSFET performs its most important role in our D Class amplifiers by allowing or preventing the flow of power and creating an efficient amplifier. The “Pulse Width Modulated” is a design that is significantly simplifies power supplies. It controls the output voltage and current precisely by not only removing the output current sensing loss, but also eliminating all secondary feedback circuitry. The PWM can increase efficiency, is lighter, smaller, can reduce total cost, productivity and system reliability.
1. Thermal, Short And Overload Protection Circuits 2. Soft Delay Remote Turn-on 3. Nickel Plated RCA Low Level And High Level Inputs 4. Green & Red LED Power Status Indicator
WHAT COMES WITH MY BASS1400?
1. Remote Subwoofer Level Control 2. Remote Subwoofer Control Cable 3. High Level Input Harness/Wire 4. Instruction Manual 5. Mounting Legs And Hardware
Low And High Level Inputs
The BASS1400 has two different ways that you can hook up a receiver to it. One is called Low level input and the other is called High level input. A low level input is measured in voltages. It comes in the form of RCA outputs from the back of your receiver and goes to the RCA inputs on the BASS1400. A high level input is measured in watts. It comes in the form one positive and one negative wire from the back of your receiver to and goes to the input terminal of your amplified subwoofer in the same wire form. Low-level (RCA) input wiring is preferred for best audio performance. Always use a high-quality RCA cable for best audio performance.
Variable Bass Boost
You have Bass Boost and Variable Bass Boost. The difference between the two is that with Bass Boost you either have extra bass or you don’t. But with Variable Bass Boost you have the control of exactly how much BASS you want to pump out to your subwoofer(s). And this is what you get with the BASS1400. Variable Bass Boost.
Phase Selector Switch
So this switch is basically to keep all of your speakers and subwoofers in the same “Phase”. If for example, you have the BASS1400 in the trunk or under your seat, and the bass is out of phase with the main (right and left) loudspeakers then you will likely get poorer quality bass. Switch your phase selector one way or the other and whichever way gives the best bass should do it.
Variable Subsonic Filter
Subwoofers start to bottom out trying to reproduce low-frequency signals that are below their abilities to sound off. Bottoming out is more a mechanical problem and happens when the subwoofer driver reaches the limit of its excursion and creates a clacking or flapping sound instead of the low frequency entering its voice coils. If your sub is bottoming out, short of changing the driver into one that has better low-frequency handling, you can try making adjustments to the subsonic filter to filter out frequencies below its specified low frequency limits.
Adjustable Input Sensitivity
Properly setting the gain on your BASS1400 is key to getting great sound out of it.The gain control is not for adjusting volume. It simply adjusts the amount of signal that is coming from your receiver and going to your amplifier. If you set it too high, you are introducing distortion into the sound. But if you set it too low, then you are choking back on what it is there to do in the first place. Here is a technique that works on most amplifiers. First, turn the amplifier’s gain all the way down. Then go up front and put on some music. Now crank the stereos volume until you hear distortion. Then back it off until the distortion goes away. Go to your amplifier and turn the gain up until the distortion comes back. Then once again, back off until the distortion goes way. And you are done!
Low Pass Filter
A low-pass filter is an electronic circuit that removes all the notes below the filter's frequency setting. A low-pass filter, set at 100 Hz for example, will block the notes above 100 Hz and allow those under that to pass. Low-pass filters are primarily used to keep high notes from subwoofers.