power amplifiers

[masudasim]

I need power amplifiers for acoustic transducers having input impedance of 150 ohm at resonant frequency. These power amplifiers should operate in audio freq range and must be capable of delivering 400-500 W output power to these transducers(i.e. to 150 ohm load) .

Does any one have idea from where i can buy power amplifiers meeting these specifications?

THANKS

 

[Skogsgurra]

What frequency?

Gunnar Englund

http://www.gke.org

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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...

 

[masudasim]

Audio frequency range is from 1k to 10 KHz and resonant frequency of transducer is near 3.3 K Hz

 

[Skogsgurra]

Audio amplifiers that can deliver 500 W are common. Use a transformer for impedance/voltage matching, if needed.



Gunnar Englund

http://www.gke.org

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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...

 

[masudasim]

Thanks for suggestion Gunnar Englund. I also require zero phase distortion at the output of power amplifiers so that beamforming(depending strongly on phase) can be performed.

Do these commercially available audio amplifiers(for music etc) satisfy zero phase distortion requirement?

Also will the step up transformer at the output of power amplifier produce any noise or phase distortion?

THANKS

 

[Skogsgurra]

The human ear is very sensitive to distortion and modern audio amplifiers are extremely good in that respect.

The phase shift (distorsion) is constant at a constant frequency and usually very constant between amplifiers. The stereo picture is very sensitive to phase distortion and, again, modern audio amplifiers are good there too.

You haven't given any numbers as to allowed distortion, so it is difficult to say if they will make the job. But, low cost as they are, you could easily find out by trying them. Or read the data sheets.

Transformers do not produce noise (except for magnetic domain reversal, which would be close to zero). There can be some phase shift in them. But that is usually at the pass-band's extremes and not in the middle of the audio band (where your signals seem to reside).

Gunnar Englund

http://www.gke.org

--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...