Sure-Electronics.com class d amps - Page 2

Sherman · 7th November 2007, 10:42 PM

Just ordered one of these myself. I've got a couple PS to test with but if I like it I'll likely end up building a supply.

buzz1939 · 7th November 2007, 11:21 PM

Quote:

Originally posted by Neil Davis

Hmmm...I would have taken off that heatsink within 5 minutes of opening the package. Inquiring minds need to know!

Mine was supposedly shipped on Nov 1 but it hasn't shown up yet.

I guess I wasn't curious enough, I didn't want to mess with potentially stripping and replacing the thermal paste or whatever might be in there. At least until I've had a chance to listen to it for a while.

Mine was also shipped the 1st - I think they finally got them in stock then - and arrived in Boston on the 6th, kind of surprising.

Ouroboros · 8th November 2007, 07:22 AM

If the power-amp package is the same as the other Sanyo STK428 range, then taking the heatsink off won't help! My STK428-430 only has the markings on the underside of the package. The top side is all exposed metal to thermally couple to the heat sink.

kellyinvestor · 8th November 2007, 06:43 PM

I'm thinking about using one to run two dvc subs for my home theater, what do you guys think?

Tekko · 8th November 2007, 07:01 PM

Too low power.

kellyinvestor · 8th November 2007, 07:50 PM

claims to be 400w

buzz1939 · 8th November 2007, 08:09 PM

That's usually measured at a much higher frequency, IIRC. 1 khz or so. And with more distortion than you'd really accept. Very different results at low frequencies on this one.

DreadPirate · 8th November 2007, 08:30 PM

I asked the eBay seller what manufacturer made that chip and the response was that it was "custom."

Dear xxx,
Thanks a lot for your letter. This amplifier assembled a custom module, did not use amplifier chips. Feel free to contact us if you have any questions.
Best wishes.
Sure Electronics

buzz1939 · 8th November 2007, 11:25 PM

I got the same response. It struck me as somewhere between unlikely and impossible - what do people think?

Back to the power rating for a minute, it's listed at 100W in the title, but that's probably at 10% THD or something. Spec is 75W / ch with 1% THD into 4 ohms. And typically that's an exaggerated number, under ideal conditions (at the frequency that gives the highest output), rounded up.

BTW, any thoughts on how to bridge this? Nothing that will short it out, since I'd be stupid enough to try it without knowing what I was doing.

theAnonymous1 · 9th November 2007, 02:11 AM

Quote:

Originally posted by buzz1939
BTW, any thoughts on how to bridge this? Nothing that will short it out, since I'd be stupid enough to try it without knowing what I was doing.

It is already bridged, hence the single supply and two inductors per channel.

You might be able to parallel the channels for more current with low impedance loads.

7th November 2007, 10:42 PM	#11
Sherman diyAudio Member Join Date: Feb 2004 Location: Chicago area	Just ordered one of these myself. I've got a couple PS to test with but if I like it I'll likely end up building a supply. __________________ --Sherman

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8th November 2007, 07:22 AM	#13
Ouroboros diyAudio Member Join Date: Dec 2003 Location: Nottingham UK	If the power-amp package is the same as the other Sanyo STK428 range, then taking the heatsink off won't help! My STK428-430 only has the markings on the underside of the package. The top side is all exposed metal to thermally couple to the heat sink.

8th November 2007, 06:43 PM	#14
kellyinvestor diyAudio Member Join Date: Dec 2006	I'm thinking about using one to run two dvc subs for my home theater, what do you guys think?

8th November 2007, 07:01 PM	#15
Tekko diyAudio Member Join Date: Jan 2005	Too low power.

8th November 2007, 07:50 PM	#16
kellyinvestor diyAudio Member Join Date: Dec 2006	claims to be 400w

8th November 2007, 08:09 PM	#17
buzz1939 diyAudio Member Join Date: May 2007	That's usually measured at a much higher frequency, IIRC. 1 khz or so. And with more distortion than you'd really accept. Very different results at low frequencies on this one.

8th November 2007, 08:30 PM	#18
DreadPirate diyAudio Member Join Date: Jan 2006 Location: Northern Virginia, USA	I asked the eBay seller what manufacturer made that chip and the response was that it was "custom." Dear xxx, Thanks a lot for your letter. This amplifier assembled a custom module, did not use amplifier chips. Feel free to contact us if you have any questions. Best wishes. Sure Electronics

8th November 2007, 11:25 PM	#19
buzz1939 diyAudio Member Join Date: May 2007	I got the same response. It struck me as somewhere between unlikely and impossible - what do people think? Back to the power rating for a minute, it's listed at 100W in the title, but that's probably at 10% THD or something. Spec is 75W / ch with 1% THD into 4 ohms. And typically that's an exaggerated number, under ideal conditions (at the frequency that gives the highest output), rounded up. BTW, any thoughts on how to bridge this? Nothing that will short it out, since I'd be stupid enough to try it without knowing what I was doing.

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