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Class D Switching Power Amplifiers and Power D/A conversion

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Old 20th September 2008, 11:37 PM   #1
diyAudio Member
 
Join Date: Oct 2003
Location: UK
Default Help me out here guys!

Planning my first journey into diy class D (on a shoestring budget)

Down to two affordable kits: NewclassD and Coldamp (yes I do know the issues with the Coldamp postings but what's a poor peasant to do)

Has anyone here been able to have a listen to either or preferably both and can give a me a reasonable assesment of how they sound in a 2 channel hi-fi system.

I'm also looking for a nice (cheap) case to build a pair of these class d kits into monoblock amps. Prefer the shoebox format. Any suggestion on this? Bear in mind that I will be using a linear supply so will need a bit of height. Also to take into consideration that I am in the UK so lots of shipping, duty and tax to pay from international suppliers.

Looking forward to your speedy responses and recommendations.

Thanks guys

John
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Old 21st September 2008, 01:43 AM   #2
diyAudio Member
 
Join Date: Jul 2004
Location: Seattle USA
Hey - how about trying some UK products and letting us know if they're worth pursuing?

I'd consider the Magnatec:
http://www.amplifier.co.uk/

And these look interesting.
http://www.prismaudio.co.uk/Prism_frameset.htm
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Old 21st September 2008, 09:53 AM   #3
ssanmor is offline ssanmor  Spain
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Join Date: Jan 2002
Location: Madrid
Well, we also have enclosures at coldamp.
MK12 is a small case that takes advantage of the small size of our powerful switching PSUs. Depending on the model you choose and the number of BP4078 modules inside, you can build stereo or mono amplifiers up to 2x400W/4ohm or 1200W/4ohm (bridge mode, music rating).
If you need more info, just send us an email.

Best regards,
Sergio
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Old 21st September 2008, 01:30 PM   #4
diyAudio Member
 
Join Date: Oct 2003
Location: UK
Quote:
Originally posted by raintalk
Hey - how about trying some UK products and letting us know if they're worth pursuing?

I'd consider the Magnatec:
http://www.amplifier.co.uk/

And these look interesting.
http://www.prismaudio.co.uk/Prism_frameset.htm
Hi raintalk,

Thanks for the heads-up on these. Had a quick look, seems like they are more into guitar amp or industrial amps so I don't know how they will lie in a hi-end audio system but will follow up tomorrow.

I'll keep you posted
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Old 21st September 2008, 01:30 PM   #5
diyAudio Member
 
Join Date: Oct 2003
Location: UK
Quote:
Originally posted by ssanmor
Well, we also have enclosures at coldamp.
MK12 is a small case that takes advantage of the small size of our powerful switching PSUs. Depending on the model you choose and the number of BP4078 modules inside, you can build stereo or mono amplifiers up to 2x400W/4ohm or 1200W/4ohm (bridge mode, music rating).
If you need more info, just send us an email.

Best regards,
Sergio

Hi Sergio,

NOTE! I said linear supply. So I think your case MK12 is too thin. (h)

NOTE! I said monoblock amps. So I think your case is too large. (w x d)

NOTE! I said cheap. So I think your case is too expensive (2 x 140)

But thank you anyway. Still thinking about your modules though.
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Old 24th September 2008, 05:00 PM   #6
diyAudio Member
 
Join Date: Oct 2003
Location: UK
Quote:
Originally posted by raintalk
Hey - how about trying some UK products and letting us know if they're worth pursuing?

I'd consider the Magnatec:
http://www.amplifier.co.uk/

And these look interesting.
http://www.prismaudio.co.uk/Prism_frameset.htm

Hey raintalk,

The Magnetec look to be the way to go. Prices are about 388/$715 for a pair of the 600W modules. Have talked to their distributors and he says that he has used them in a head to head with some big Krells and they blew the Krell out of the water. He was also using Wilson speakers on the end of them. So if he is telling the truth then these seem to be just what I need.
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Old 25th September 2008, 10:39 AM   #7
ssanmor is offline ssanmor  Spain
diyAudio Member
 
Join Date: Jan 2002
Location: Madrid
Hello, Jaydeece.
Sorry, I read the post too quickly and didn't see that you were asking for a linear PSU. Don't hesitate to contact us for any information or advice you may need, though.

Best regards,
Sergio
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Old 30th September 2008, 04:11 PM   #8
diyAudio Member
 
Join Date: Jul 2004
Location: Seattle USA
Quote:
Originally posted by jaydeecee



Hey raintalk,

The Magnetec look to be the way to go. Prices are about 388/$715 for a pair of the 600W modules. Have talked to their distributors and he says that he has used them in a head to head with some big Krells and they blew the Krell out of the water. He was also using Wilson speakers on the end of them. So if he is telling the truth then these seem to be just what I need.
Cool!
Let us know your results.
They do look good.
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Old 19th October 2008, 01:17 PM   #9
diyAudio Member
 
Join Date: Oct 2003
Location: UK
Quote:
Originally posted by raintalk


Cool!
Let us know your results.
They do look good.

Hi raintalk,

I have taken the plunge and ordered two Ecotec 600W amps (magnetec) and take delivery this week.

Managed to get them for 322/$550 inc. delivery.

I'll keep you posted once I have them up and running
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Old 25th November 2008, 03:56 PM   #10
diyAudio Member
 
Join Date: Oct 2003
Location: UK
Just thought you might like to see my new Class D amps. Just waiting on delivery of two power transformers, the rest is done. Can't wait to fire them up.
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