06-16-2003, 01:03 AM
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#2
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CF Senior Member 
Member Since: Jun 2002
Location: Boise ID
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Re: Mono Block Amp? (apollo30346)
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A mono amp means that there is a single amplification channel. MY JL 1000/1 has a stereo input even though it's mono.
JL reccomends (to get the best performance) getting a Y connector from radio shack or the like.
Class D amplifiers use a digital switching technology to switch the amplifiers output devices at a very high rate. When you average the switching off and on, you get a sine wave, and hence sound. Because switching it much more effiecient than current control (mosfets) you get a much higher effeciency, lower heat output, and smaller chassis.
Because the Class D devices can only switch so fast by design, they loose sonic resolution the higher the frequency they have to amplify... so most of the time you only see them amplifing to 120hz.
Tripath developed a faster switch, but it doesn't handle as much power. They dubbed thier design Class T. Because it switches so fast it can amplify the enitre range... but looses current control, and hence has a lower power output.
Class A/B devices use a bias current that is always on, this allows for a VERY accurate control of the output current. Because of the higher bias current there is a lot of energy wasted, so thier effeciancy is low (30 - 50%). But the sound is much lower.
The following is pretty standard for quality amps at full power:
A/B: .01% THD
D: .5% THD
T: .1% THD
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