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Old March 26th 19, 05:06 AM posted to alt.comp.hardware.pc-homebuilt
Flasherly[_2_]
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Posts: 2,192
Default Nice

Got the NEOTECH DAC. Smaller USB PWR plug & basically the same as the
older unit.

Except the NEOTECH headphone output plug works. The old unit was pure
static, run simultaneously with the TOSLINK engaged, with the same
static bleeding, regardless, into the TOSLINK with the sensitivity
jacked up for a discernible noise floor.

The NEOTECH also has a noise floor -- either need be workable at high
volume amps fed by:

a mixer unit's:
cntrl out 22dbu (13 uV)
headphone out 19dbu (9 uV)
both into mixer
from mixer
into four J61 tubes @
tube buffers ratings (set for about a quarter the vol: output):
Input Sensitivity: 300 ~ 2000MV
Output: 3000MV

The Issue before was:
a) Mixer unit's handling XONAR analogue (RCA jack) outputs
b) Mixer unit's handling of DAC/TOSLINK laser carrier unit (initial
TOSLINK out provided, additionally and as well from the Xonar
Soundboard):

Balance impedances were screwed: Non-musical interplay canceling out,
stomping all over frequencies between blending the above two.

The Fix and result from the NEOTECH DAC:
With both NEOTECH output channels, quad speakers: mini-headphone and
RCA jacks -- there is no such above disparity between blending both
from a mixer board's channel inputs. Both are matched and clean.

Thus: One NEOTECH channel to a DBX Compressor:
Input - 30V RMS Max
Output - 7V RMS @ 1kHz for 5k-ohm load

And DBX back to the mixer. I can now expand on RMS voltages, blend
the NEOTECH headphone separately, with the mixer for Wet/Dry weighing.

I like this TOSLINK data carrier stuff. I set all the software to
oversampled rates. Seems a little more crystalline, glassy and the
most accurate for higher-end encodes [FLAC] at a lower spectrum of
recording media.

Five, six stages of software processing the audio, outside and into
another three or four hardware stages with mixer, tubes, and
compressor: No rules - you got the golden ears or not. It's been nice
to say that's settled.

Anybody listened to a hi-end $300 DAC unit?
 




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