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Class D Switching Power Amplifiers and Power D/A conversion

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Old 25th September 2009, 03:42 PM   #1
ungie is offline ungie  Canada
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Join Date: Dec 2002
Location: Ontario, Canada
Default Velodyne SPL II Series amp repair

Does anyone out there have any experience with the switching amps used in Velodyne SPL Series II subwoofers?
I have both an SPL-1000II and SPL-1200II which look like they use identical amps. They are both dead other then a faint signal produced by one and a thump when switching the crossover to bypass in the other.
These subs do not have any servo feedback, so they are basically just the amp and woofer.
The line fuses are fine on both.
Velodyne service only suggests replacing the amps ($$$).
I'd love to get these working, otherwise it seems a waste of good cabinets and drivers.
Thanks for any suggestions!
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Old 29th September 2009, 01:56 AM   #2
sphinx is offline sphinx  Canada
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Join Date: Nov 2004
Location: Toronto, Ontario
These are offline amps. The AC line is rectified and that directly becomes the DC power supply for the Class D output stage. This requires isolation between the audio connectors and amplifier in the amp design. The amp can theoretically supply the advertised power but they are dialed way back because the woofer can't take anywhere near that amount. I measured the power output of the SPL800 amp it was limited to only ~300W! The only fundamental difference between the 800,1000,1200 is where they set the max power output limiter.
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