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Class D Switching Power Amplifiers and Power D/A conversion

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Old 16th May 2009, 03:23 AM   #31
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I went ahead and bought one. I must say that the clarity is outstanding. The highs are crystal clear and smooth. No listening fatigue here. The lows are somewhat lacking and the mids are almost nonexistant though. I can take care of the lows with a small sub but I'm not sure about the mids. It's feeding a pair of Fonkens with Fostex FE127s which are definitely not shy in the mids. Inspite of this the highs really make it worth listening to. I will let it burn in for awhile before I pass judgement. But for $60 delivered to my door I'm very impressed. Next up I'll build the 41Hz Amp6 Basic and compare them both. I probably won't be getting to that project very soon though.
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Old 16th May 2009, 03:56 PM   #32
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yeah its so clear and non fatiguing...i love how they don't heat up...always only less than warm to the touch.

yeah there's hardly any bass...but i use mine in my 6.1 setup, got the subwoofer and also buttkicker for the low end

they definitely sound better than my old onkyo receiver.

Is that Amp6 difficult to build? they mmust sound even better than the amphony t amp...
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Old 16th May 2009, 04:12 PM   #33
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Quote:
Originally posted by John Mactavish
Is that Amp6 difficult to build? They must sound even better than the amphony t amp...

I've only built one other small electronic project so I'm a noob. I'll let you know after I build it! If you believe what's on the internet then the 41Hz products are supposed to sound better than most amplifiers under $1000. We'll see.
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Old 10th September 2009, 07:58 PM   #34
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Hi there, i just bought the Model 100 and i am quite happy with it, it has enough power for more than listening volume with my 4 ohm speakers, and there is no background noise whatsoever, really really quiet. For quality i cannot really judge now, since the setup is really basic and there is a lot of difficulties in the listening room. I have made some pictures of the innards, i can't really tell what kind of chip they used. Can anyone give a clue about that. I would really like to know since the specs are really scarce.
Greetings,
Nils
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File Type: jpg DSC00100edit.jpg (146.1 KB, 229 views)
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Old 30th October 2009, 04:54 PM   #35
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The manufacturer says they did not use a Tripath since the Tripath chips can't reach the 115 dB S/N they offer. The pictures are good but, hmmm, are those 2 metal blocks heatsinks and is the chip located underneath them?

Anyway I wonder if this amp would benefit from a different 24V power supply, instead of the small switching supply it ships with. Anyone have any recommendations?
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Old 30th October 2009, 06:12 PM   #36
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As it seems, underneath the aluminum-blocks are just the output-transistors. There is some kind of chip involved, but i am not sure what it does. If anyone is interested, i could tra to do some sharper images.
Apart from playing quite nicely, and loud enough for room listening, this amp makes terrible noises when turned on, so i leave it on all the time. When it is connected the background is pitch black (at least with my speakers)...
Greetings,
Nils
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Old 31st October 2009, 01:24 AM   #37
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If you could remove one or both aluminum blocks and post another photo, and just sharper well lit photos that would be great. We need to read the writing on all the IC's. Manufacturers will sometimes try to erase or hide this information.

This article advances the case for SLA power supplies. I wonder where we could buy on off the shelf (24 VDC) to power the Amphony. http://www.redwineaudio.com/about/why-sla The computer market near me has a variety of smaller 6V SLA batteries used in UPS's, I guess I could string 4 of them together. Then just need to charge them. Maybe its not often a product because its so simple, and so heavy. Ideal for DIY. But wonder if all batteries are the same for our purposes. Wouldn't they need to be able to provide shots of instant power... wonder if we shouldn't add a capacitor to the mix.

Last edited by temp123456; 31st October 2009 at 01:35 AM.
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Old 2nd November 2009, 02:10 PM   #38
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