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class d project testing

99.147.149.104

Hi,

I am putting together a kit - http://classdaudio.com/index.php/class-d-amplifier-kits/home-kits/120w-x-2-240w-x-1-amp-power-supply-transformer.html

Although I built a Dynaco ST120 and PAT4, and a heathkit tuner many years ago - those kits were extremely well documented with all parts including connectors, case, etc.

This "kit" is provided as a complete amp board with all components installed, and a complete p/s again with all components installed, and a seperate tranny.

My question is regarding how to final test the connections before I finally connect the speakers. Is there a way to electrically measure the output at the speaker connections before I connect my $3000 speakers? I have a VOM and a scope (although I don't have much of an idea how to use the scope).

If I screw up the connections, I don't want to fry my $3K speakers. I suppose I could go to Goodwill and pick up a $15 pair of speakers for test purposes. But that could still hurt my ears if I messed up the connections, and even that will get inconvenient and expensive if I screw up the connections.

thanks,
Ken

Follow Ups:

The only thing that will screw up your speakers is voltage - Chris O 19:38:26 05/30/10 (1)
Put your voltmeter on the positive and negative terminals of the amp and set it to AC, turn on the amp, you should measure close to zero. Switch the meter to DC and again look for zero. Turn the amp on with the meter set to DC and look for any turn on voltages. If things look OK you are good to go.

I cannot believe that the absolute only speaker of any kind that you own are a pair of $3000 units. Wow. No kids Hello Kitty boom box?
___
Long Live Dr.Gizmo
- RE: The only thing that will screw up your speakers is voltage - kenzo 18:30:51 06/01/10 (0)
  Thank you Chris, that is exactly the info I needed!
  
  kenzo
RE: class d project testing - ejk 18:46:49 05/30/10 (5)
Go to the Audio Circles forum and there is a thread on these under Cheap and Cheerful hifi. Alot of guys are building them
- RE: class d project testing - kenzo 21:55:21 05/30/10 (4)
  After testing on TV, I now have the Class D driving my DeCapos.
  
  First impressions are "holy shit, it sounds damn good!". Especially at low spl and that is very hard to make sound good in my experience.
  
  Silky highs. Deep but taught, well controlled bass. Piano sounds excellent!
  
  Only extensive listening test of course will provide reliable test, but first impressions are that this amp may compete very favorably with my Musical Fidelity A1 2008 -a class a- amp (at 1/4 the cost)!
  - Welcome to the crowd. - Bob G 18:11:44 06/01/10 (3)
    As you'll find if you go to the Audio Circle site, there are many very happy owners of these amps. Personally, I replaced my tube mono blocs with a pair of Tom's amps. Enjoy.
    Bob
    - RE: Welcome to the crowd. - Scholl 08:24:11 06/06/10 (0)
      HEy Tom,
      
      I've been play'n with the 125watt 8 ohm version run at +-50v 33,000uf caps and realy like the sound but it doesn't best the Allen 75s but very close. I'm going to order a second one day too.
      
      The ClassDaudio.com modules are excellent DIY opertunities. I wish them well.
      
      LAter,
      
      Scott
    - RE: Welcome to the crowd. - kenzo 18:40:07 06/01/10 (1)
      I sure will, thanks Bob. I just ordered my second amp from ClassD. From his Ebay store, I believe it's a new design.
      
      http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=260485998369
      
      I also have a QUAD 909 on the way, due in next week. I will have some interesting comparative listening to do.
      
      The Musical Fidelity A1 will probably be up for sale due to the fact I cannot bypass the integrated preamp in it and I now have about 3 more amps than I need.
      - RE: Welcome to the crowd. - kenzo 18:44:20 06/01/10 (0)
        
        In Reply to: RE: Welcome to the crowd. posted by kenzo on June 01, 2010 at 18:40:07
        
        I should have mentioned one - first impression only- weakness in the amp is that cymbals just don't sound as good as from the Musical Fidelity or the Tube OTL.
        
        They sound more "hissy" and less "tingly". Sorry for the wording, we just don't have english words with adequate descriptive detail for describing sound...

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