SURE Class D amplifier kits @ PartsExpress.com - AVS Forum
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post #1 of 11 Old 08-15-2010, 04:20 PM - Thread Starter
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Just got an email from PartsExpress about these new Class D Amplifier kits.

The price is right. I wasn't sure if anyone had experience with them.

4x100 @ 4ohms
2x100 @ 4ohms

May be a decent (and very cheap) amp for the efficient horns.
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post #2 of 11 Old 08-15-2010, 04:40 PM
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Anyone built one. A good link with instructions would be cool. I need a 4x100 Digital amp for my bedroom. I can not find any older Panasonics XR-55s online any more.

It is not "open-minded" to reject knowledge - Bob Lee
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post #3 of 11 Old 08-15-2010, 04:56 PM - Thread Starter
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Here is a non-technical review but still good none the less on the 2x100

http://www.justblair.co.uk/sure-2x10...pressions.html

Also just noticed there are a bunch of good videos on youtube (mostly from Europe)

http://www.youtube.com/results?searc...amplifier&aq=f

These may be a winner.
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post #4 of 11 Old 08-15-2010, 09:24 PM
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Looks like this is the other piece of the puzzle. http://www.sureelectronics.net/goods.php?id=61
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post #5 of 11 Old 08-15-2010, 09:32 PM
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I just saw these posted on another forum and, after looking at the pics closer, I'm certainly not going to be trying them out. The output impedance is gonna be way too high thanks to the tiny output filter inductors...

Also, Class D shouldn't require fan cooling for 100W of output.

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post #6 of 11 Old 08-16-2010, 12:17 AM
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Those amplifiers have too much distortion to handle the wattage they claim. I prefer to build the AMP11 from 41hz.com. It is basically the same amplifier, 41hz.com spent more of an effort on the quality. These high power class-D amplifiers require heat sinks. Saying they do not is just being stupid.
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post #7 of 11 Old 08-16-2010, 07:00 AM
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Quote:
Originally Posted by electroju View Post

Those amplifiers have too much distortion to handle the wattage they claim. I prefer to build the AMP11 from 41hz.com. It is basically the same amplifier, 41hz.com spent more of an effort on the quality. These high power class-D amplifiers require heat sinks. Saying they do not is just being stupid.

The linked kits are NOT high power. 100w @ 10% THD? No thanks. They are 30w/chan amps. No fan necessary for that.

"Vintage" is good for wine, not for A/V equipment.

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post #8 of 11 Old 08-16-2010, 07:10 AM
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Quote:
Originally Posted by electroju View Post

These high power class-D amplifiers require heat sinks. Saying they do not is just being stupid.

A heat sink and fan are NOT the same thing.

The last Class D output stage I designed was good for 250W with a small passive heatsink and was even switching at 1MHz...it was also about $20 in parts without the power supply.

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post #9 of 11 Old 08-16-2010, 04:39 PM
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Quote:
Originally Posted by MBentz View Post

A heat sink and fan are NOT the same thing.

A heat sink and a fan are used to optimize the heat dissipating ability. A heat sink and a fan are called an active heat sink. Using a heat sink that has more surface area, then the fan is not needed. There is multiple ways to use as a heat sink. One is using a metal chassis and mount the heat generating devices to that. In this case, there is no visible heat sink.

You have to think. The Sure amplifier kit and 41Hz.com AMP11 kit uses an transistor array chip. All the heat is generated by this chip in a small area. In your amplifier, probably the heat is spread out to multiple separate transistors.

Quote:
Originally Posted by DonoMan View Post

The linked kits are NOT high power. 100w @ 10% THD? No thanks. They are 30w/chan amps. No fan necessary for that.

Dah. The Sure amplifiers are 30 watt amplifiers. The amplifiers can handle 100 watts, but only if the power supply voltage is increased to 32 volts which is the maximum limits
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post #10 of 11 Old 08-18-2010, 09:50 AM
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i was a early adopter.

I subsiquently sold my parasound halo a51.

and baised on my experiences with this unit have now continued on the class T theme and bought 4 x the connexelectronic v3c amps.

I know most just wont beleve me or assume this is just another fanboy, but ive tried soo many amps over the years and now found my amp for life. The sure board is vertually identical sounding just less power.

I tried battery,smps and transformer power supply and much to my surprise the smps is considerably better than the others. (used the meanwell 24v unit on sures website.)

there not overly powerful, but the distortion works the same as a valve amp - ie all the details of the music are at low output and the amp gives a genuine 0.07% at low levels- which is where you want it. basically the distortion raises with level. dynamic content is by nature high power and higher distortion is practically irrelevant in this situation- so not as bad as you would think.

my thread on it.-
http://www.avforums.com/forums/audio...power-amp.html
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post #11 of 11 Old 08-20-2010, 12:56 PM
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Quote:
Originally Posted by penngray View Post

Anyone built one. A good link with instructions would be cool. I need a 4x100 Digital amp for my bedroom. I can not find any older Panasonics XR-55s online any more.

Bzzzt... Sorry, but class D does not mean digital. It means class D. They work on PWM- which is an analog process.
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