class d amp board to power mordaunt Short 309

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#2
Hi,
your question is not so easy to answer. Depends on what your have / want.

First, how many ohm´s has your sub got and second, how many watt power do you need. This one makes 100w at 2 ohms, 50 at 4 and only 25 at 8.
Also, do you plan to re use the sub´s power supply?
What voltages do you have to offer.
Last, what about the filtering of the sub channel and the adaptation of the stereo signal into mono?

So, maybe give some more information, then someone might give you some educated advice.

This amp module you showed is OK, as far as some have tried it. Just not too powerful and does need a single 24 volt supply.
 
#3
thanks for the response, the speaker in question is a 10" 4 ohm Mordaunt short driver. I am researching the old toroid power unit that is in it and believe it is a 40-0-40v supply. As for filtering, I will be supplying from the sub-out on my AV receiver so assumuing that it is a pre-filtered source.
 
#4
So, just to update and close this thread. I ended up buying this:
TPA3116 Digital Subwoofer Amplifier Board Module Bass Output 100W DC12 to 24V 822449818349 | eBay

Purchased on the basis it has an in built crossover which blocks everything above 180hz, there were others available but they apparently cut off at 150hz which was just a little too severe for the tiny Tannoys I have. Powered using a 65W 20V Lenovo laptop power supply the sound is far better than it has any right to be. If you are willing to do a little drilling you can connect up the old knobs (as I did) and had I been bothered enough I could have added a switch and connected the LED up at the front.

I was worried that the PSU would not be man enough, but so far I cant imagine getting much more out of it using a 25v 100w supply. Using a bass frequency test it seems to give very good response to about 32-34Hz and sounds very nice. So top tip to anyone sitting on a blown sub take a look at the above.
 
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