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RE: PPP problems.

75.18.169.26

PaulDB

In Reply to: RE: PPP problems. posted by Mali on February 03, 2008 at 14:54:41

There must be something wrong. My output THD is consistently 0.4 while the input THD varies between 1.4 and 2.8.

Follow Ups:

RE: PPP problems. - PaulMC 07:15:59 02/04/08 (5)
Not necessarily, it sounds ike the PPP is doing exactly what it should. There are other factors involved that the PPP metering system doesn't measure, like noise above 100kHz. You might try placing a Duet in front of the PPP. Maybe go to our online store - or a dealer's online store - get one and try it. If it works you can keep it, if not, return it and get your money back. By doing this, you can reduce the higher frequency noise and, while it won't eliminate it, you can at least see if it helps or does nothing, thus pointing you towards the answer.
- RE: PPP problems. - Mali 21:09:29 02/04/08 (4)
  Paul, I had a Duet, ordered at the same time as the PPP in Denver. I used it briefly with the PPP, but sent it back, since imo, it didn't make much difference, in fact, I prefered the sound without it. But go figure, I am using an old Ultimate Outlet with the PPP, and, obviously, prefer it to the Duet. Tonight the input THD is still 5.0, but the output is fluctuating between 2.1 and 2.2. I wish could get a .4 output like the other guy.
  - RE: PPP problems. - PaulMC 05:17:09 02/05/08 (3)
    What is your input and output voltage?
    - RE: PPP problems. - Mali 05:48:33 02/05/08 (2)
      Input voltage 120/121, output 122/123. It's 6:30 A.M. and the input THD is a rock solid 5.0, but the output THD is 1.6-1.8. There is a marked difference in the quality of the sound at the 1.7 THD output range compared to when it's 2.3 or 2.5.
      
      Edits: 02/05/08
      - RE: PPP problems. - PaulMC 07:59:51 02/05/08 (1)
        
        In Reply to: RE: PPP problems. posted by Mali on February 05, 2008 at 05:48:33
        
        You can probably change the output THD by adjusting the output voltage. If you're careful, there's a small set screw adjustment on the bottom of the PPP near the front panel. Adjust this with a small screwdriver from minimum distortion on the output, ignoring the resulting output voltage which is going to change somewhat.
        
        Call Barrows if you need help.
        
        RE: PPP problems. - Mali 15:56:38 02/06/08 (0)
        
        In Reply to: RE: PPP problems. posted by PaulMC on February 05, 2008 at 07:59:51
        
        Thanks, Paul. When I get the chance I'll call.

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