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Class D Switching Power Amplifiers and Power D/A conversion

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Old 1st April 2013, 10:24 AM   #21
pegodk is offline pegodk  Denmark
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Join Date: Apr 2012
Location: Copenhagen, Denmark
I have also made a boombox using the monacor SP-60 units. Worked out really well. I just used 1 per side and a tweeter I had laying around (dynaudio d23).

Was I to make a simillar build today I would probably use 2 SP-60/8 in parallel for 4 ohm effectively and some horn tweeter (maybe HT-30, but havent put much thought into it). That way it would be a stereo build in the sense that the right channel would play forward and left backwards. Doesn't really matter much since most of the material today is mono and you dont really feel the stereo when the channels are this close together anyways.
You're way of building a stereo boombox is also an interesting option definitely worth considering.

What kind of crossover do you use? I actually did some measurements of the boominator for a friend of mine and tbh I'm not impressed. That design has some huge problems centered around the fact that they use piezo tweeters and it drives the 10" bass units deep into their breakup region..

You can get a much better result with this project
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Old 1st April 2013, 12:12 PM   #22
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Join Date: Mar 2012
I finished the project the quick and dirty way. My Girlfriend painted it and it looks awesome.

Click the image to open in full size.

The performance though is "sufficient". I didnít seal it property und the whole contruction isnít really stiff enough. The SPs run fullrange and I just put a Capacitor in series to the tweeters.
I donít have audio measurement tools so all I can say is that it does not sound too bad, but the measurements would probably show how much more potential there is.
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Old 1st April 2013, 03:15 PM   #23
pegodk is offline pegodk  Denmark
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Join Date: Apr 2012
Location: Copenhagen, Denmark
Looks really cool. I didn't realize that I was reviving an old thread before I posted, but it was nice to see that it turned out pretty well

Yes, its always a problem to do the crossover without measurements. It's always possible to do it out of datasheets, but they tend to be quite optimistic..

Anyways, nice to see the picture
Cheers!
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