OK

Bridging works like this in theory.

You have an amplifier which has say a 2kw power supply.

Its power o/p into 8 Ohms is 100 watts RMS (28.4 VAC @ 3.55 Amperes RMS= 100.82 watts RMS)

If you bridge this same amplifier into an 8 Ohm load in theory you should get twice the voltage across the 8 Ohm load (56.8 VAC RMS @ 7.1 Amperes RMS = 403.28 Watts RMS)

Or 4 times the power o/p

If you then half the impedance or load on this bridged amplifier to say 4 Ohms. In theory you should get twice the o/p power again.

(56.8 VAC @ 14.2 amperes = 806.56 Watts RMS)

Which is 8 times the power o/p into 8 Ohms on an non-bridged amplifier or 4 times power o/p @ the same impedance of 4 Ohms.

Now this is assuming ideal amplifiers and power supplies with no losses what so ever

In practice this doesn't happen....

If you look at any commercial amplifier which operates in bridge mode, they only ever double their power o/p into any given load equal to the non bridged load...

My AV800 amplifier produces over 870 watts rms into 4 Ohms non bridged. In bridge mode it produce about 1600 watts rms into 4 Ohms with a 2KVA transformer. Into 8 Ohms bridged it produces about 870 watts. which is about double its power o/p into 8 Ohms of 450 watts RMS.

The only commercial amplifier that could possibly come close to 4 times the o/p power would be Crown amplifiers. Which use Grounded Bridge Technology and even then they a subject to power losses and produce 4 times the power o/p or greater by driving into impedances of 2 Ohms or less...

Another amplifier would be Krell and not even Nelson Pass amplifiers x1000 can produce 4 times the power o/p in bridge mode using just two single module amplifiers into 8 Ohms...

I am willing to be corrected here, But I just don't see it...

regards

Anthony Holton