Crack 5998 low volume

m17xr2b · 8663

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Offline Jim R.

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Reply #30 on: February 23, 2013, 02:53:25 PM
Perhaps it's time to talk to Qing-Hua?  Sounds like maybe something went kahput with the dac's output section -- possibly.

Sorry it's so frustrating but at this point I really don't think it't the crack.

-- Jim

Jim Rebman -- recovering audiophile

Equitech balanced power; uRendu, USB processor -> Musette DAC -> 5670 tube buffer -> Finale Audio F138 FFX -> Cain and Cain Abbys near-field).

s.e.x. 2.1 under construction.  Want list: Stereomour II

All ICs homemade (speaker and power next)

Offline adamct

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Reply #31 on: February 23, 2013, 03:13:57 PM
Yeah, it's definitely not the Crack. I'll contact him...


Offline Paul Joppa

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Reply #32 on: February 23, 2013, 04:57:17 PM
Your logic is perfectly good, so it is very likely one of your assumptions is wrong. Sorry that's not as much help as one would hope!

Is the interconnect good? Does it actually connect to the jacks at each end? With no shorts? Perhaps you could find a source of constant-voltage sine wave, and measure the output voltage between the balanced outs (should be 5vFS), from ground to each of the balanced outs, and ground to the RCA "hot". Repeat at every stage - DAC jacks, cable ends, connectors inside each target device, ...

Having seen a zillion of these kinds of question, I am confident you will find the answer eventually!

Paul Joppa

Offline adamct

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Reply #33 on: February 23, 2013, 05:30:25 PM
Question: if one of the hot signal lines to the balanced outputs were to have a really weak signal (e.g., if L+ and R+ were both weak, but L- and R- were both normal), would the balanced outputs sound odd when feeding a balanced amp? Would the signal be weaker, wonky or would there be no sound at all? I'm wondering if maybe that is what happened and the hot signal to the unbalanced outputs is somehow defective, which is why the unbalanced outs sound weird, but because the other hot signal is fine, the balanced signal still works and appears fairly normal?


Online Paul Birkeland

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Reply #34 on: February 23, 2013, 05:36:49 PM
Play a 60Hz tone through the DAC, measure the AC voltage between the hot and cold pins on the XLR jack, then between hot and ground and cold and ground.

This would be a nice way to verify that things are in order.

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

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