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Old 3rd January 2009, 12:58 AM   #1
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Default Transformer size

I thought about including this in a thread that i already have but my guess is that this might be a good question for others as well. I have been searching all day for information on how to choose the right size transformer for class d. All information i have found is in regards to A or AB.

In my case using the NewClassD modules with 1 PSU. I will be powering 200watt max 89db sensitivity towers.
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Old 4th January 2009, 05:42 PM   #2
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Location: Canada

Look at this thread.


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Old 4th January 2009, 09:41 PM   #3
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Location: Silicon Valley
in a nutshell, since ClassD is very efficient, you do not have all of the losses involved in A & A/B amps so you do not need to over size the supply so much.

You would do very well with a VA rating ~ the same as your desired output watts.

so say for 200W per channel, two channels = 400W -- a 400VA transformer should do very well.

Looking around at commonly available transformers would seem to recommend aiming for a 500VA model from any of the usual suppliers.

even this is still conservative, since real music and general audio material will not push an amp to more than a few % of it's real rated output very often.
(really 300VA would even be fine, but 500 will give lot's of headroom and a bit stronger supply

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Old 4th January 2009, 09:50 PM   #4
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Location: Canada

Please check these guys out, you can get a 400VA for 44 USD.

I just ordered a few from them.

Antek Xtrm

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