Inversing one channel in Power Amps

[V9977]

Would there be any advantage sound-wise in inversing the balanced input of one channel
of a power-amp and then connecting the speaker inversed to maintain phase with the other channel.

This would be for high-power PA applications.

Thanks.

 

[Majestic12]

Why should there be any difference ? The amp does the same job regardless of the polarity of the signal.

 

[gyraf]

I see the point - for common-mode signals the power supply load would be distributed evenly to both rails..

I like the idea, but I'm not sure of all it's implications

Jakob E.

 

[JohnRoberts]

Would there be any advantage sound-wise in inversing the balanced input of one channel
of a power-amp and then connecting the speaker inversed to maintain phase with the other channel.

This would be for high-power PA applications.

Thanks.

A few amp makers have done this before. Carver may have been the first that I recall decades ago. It actually makes a few watts more power from a common power supply. Not audibly significant, but enough extra watts on paper to impress customers. One downside is speaker low/ground lead on one channel is now hot so you have to be careful about inadvertent grounding of that hot lead.  I actually encountered a customer with that problem from a snake that had speaker power leads built in. The sleeves of the speaker lines were grounded in the snake break out box. So the sleeve on a tip/sleeve speaker plug was hot and shorted out. 

I used this in the amp section for a couple hundred watt powered mixer years ago, but for a different reason. Not for the few extra watts, but so I could easily offer a bridged mode output just by adding another output speaker jack.  So both amps could drive one speaker differentially (2x voltage, 4x power). I never used this in a normal amp.

JR

 

[SonsOfThunder]

FYI, virtually all car stereo full range 2ch amps are this way for easy bridge-mode connection. No real advantage, don't believe any hype you've heard.

Charlie

 

[V9977]

Cheers for replies people.

What about if running from a mobile petrol generator?!