1000W or greater Plate Amps? - Page 2 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #11 of 13 Old 01-30-10, 08:25 AM
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Re: 1000W or greater Plate Amps?

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Veltinorian wrote: View Post
Or you could buy cheap 2x 500 or 2x1000watts plate amps and manage somehow to invert the one output and connect the sub between one non-inverted and one inverted output - thus the power is 4 times higher as with one amp. The so called bridge mode P=U^2/R. But be careful that power may be too high for your sub.
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post #12 of 13 Old 01-30-10, 10:39 AM
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Re: 1000W or greater Plate Amps?

Yeah, what is actually the bridge mode for an amplifier? (In a stereo amp like Behringer EP2500 there are in fact 2 mono amps, right?) That is when the output signal is delivered from 2 amplifiers. The signal from one of them is shifted or inverted by 180. The sub is hooked up then to the both amps, no ground cable here. I have done it several times with my DIY power amp, have it measured by an oscilloscope and the voltage across the sub is 2 times higher than with one amp and that automatically means 4 times more power to it ( because Power=(Voltage)^2 / R ) !

The signal for just one amp needs to be inverted you hook up the speaker/subwoofer between the two outputs (the +lead goes to the non-inverted output and the -lead of the subwoofer goes to the inverted amp accordingly) and you get 4 times more power.

Last edited by Veltinorian; 01-30-10 at 10:49 AM.
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post #13 of 13 Old 01-31-10, 09:21 PM
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Re: 1000W or greater Plate Amps?

Has anyone thought of what you gain from doubling the power input?

The answer is 3 db more from 500 to 1000 watts. Another 6 db referenced to 500 watts if you jump to 2000 watts. The realization that 3 db is barely noticeable should hit you smack in the forehead.

The cheaper route is adding drivers and keeping the power constant. Each additional driver adds 3 db acoustically and possibly 3 more db for lower impedance to the amp terminals if you can drive the lower impedance. That's 6 db more. Yes you need a bigger box. But you get lower distortion and better power handling and the equivalent of a 2000 watt amp for carefull driver and box choice.

go horn loaded if you really want to blow peoples minds. A well done horn will lift the efficiency of a driver by almost 10 db. That is a 12 fold increase in the efficiency!

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