Re: [SlimDevices: Audiophiles] Squeezebox A/B - digital out rca out same level?

2009-05-21 Thread TiredLegs

The difference you're hearing could be due to higher gain in the op amp
section of the DAC compared to the op amp in the Squeezebox. If you do
the same test with the analog and digital outputs from a CD player, do
you hear the same difference?


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Re: [SlimDevices: Audiophiles] Squeezebox A/B - digital out rca out same level?

2009-05-20 Thread dekaliber

I thought I had updated here with my observations, but I realized I
never did.

I wouldn't really say that there is a dramatic difference between an
external DAC and the Squeezebox's.  I discovered that either the SB's
digital coax or the CI Audio VDA-2 outputs a signal 1.5 dB louder than
the SB's analog outputs, which is what accounted for the immediately
noticeable difference at first.  In order to test I have to switch to a
blank input, change the volume on my preamp, and then switch to the
other input.

If nothing else, I think the CI DAC has a different character than the
SB3.  Non-blind impressions have been that it sounds a little bit warmer
and fuller, but the difference is so subtle that I'm not sure I'd miss
it.  I'll have to do a blind test at some point, as I still have to do
with the Transporter.  If I can correctly identify which is which 8 out
of 10 tries (95% confidence), then clearly it has an affect!


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Re: [SlimDevices: Audiophiles] Squeezebox A/B - digital out rca out same level?

2009-05-18 Thread BlueScreenJunky

peterw;422019 Wrote: 
 Not I'm the latest software verisons. Don't recall when that changed --
 sometime after 7.0. That capability was removed to make room for other
 stuff in the Squeezebox firmware.

Damn ! I was hoping i'd be able to do that in order to so the same kind
of testings (A friend of mine will bring his Zhaolu DAC to compare it
with SB3's DAC).
So, is there any other way to level the volumes ? (which does not
involve buying some expensive hardware)


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Re: [SlimDevices: Audiophiles] Squeezebox A/B - digital out rca out same level?

2009-05-18 Thread dekaliber

If you have a preamp that can set different levels for different inputs,
you're good.  Otherwise, you might have to look into passive
attenuation.


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Re: [SlimDevices: Audiophiles] Squeezebox A/B - digital out rca out same level?

2009-05-18 Thread BlueScreenJunky

Nope, only an integrated amp. I'll see what I can do with squeezeslave
and the digital output of my PC :-/

I'll check passive attenuation too, thanx.


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[SlimDevices: Audiophiles] Squeezebox A/B - digital out rca out same level?

2009-05-09 Thread dekaliber

I'm currently doing some A/B testing of the Squeezebox v3 with a Channel
Islands VDA-2 + VAC-1 power supply.  The SB is connected via digital
coax to the CI amp, which is connected to input 1 in my NAD M3
integrated.  The SB also has its RCA outs to input 2 in the same amp.

I've been switching between them and the difference is quite
pronounced, but I just want to make sure it's not an artifact of the two
outputs having different volume levels, or perhaps the CI unit
introducing slight gain.  Off the bat (with about 15 minutes of
listening), the CI DAC sounds much more engaging and the bottom end is
noticeably more present.  Switching back to the SB's analog outs, the
sound is leaner and less forward.  There is really a dramatic difference
in overall presence.  Much, much more than I expected to hear, which is
what's making me a little suspicious.

Can anyone familiar with the hardware chime in?  As far as I know, all
of the input on the NAD M3 have the same gain.


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Re: [SlimDevices: Audiophiles] Squeezebox A/B - digital out rca out same level?

2009-05-09 Thread Anne

Depending on your system, its quite normal that an external dac is
better. Is the dac good enough you get true high end sound from that
little plastic Squeezebox.
I use a Bryston dac, and Inguz roomcorrection and I wouldnt go back to
a cd player even if I got it for free.and for the record, I think
the built-in dac in SB3 is average.
The gain in digital is determined by the source, the file on the
computer that is. For example, the digital out on my satellite decoder
is really low, and from my dvd player its normal.


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Anne

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Re: [SlimDevices: Audiophiles] Squeezebox A/B - digital out rca out same level?

2009-05-09 Thread SuperQ

Yes, you should use a white/pink noise track to calibrate the output
differences between the two sources.  You can either use an acoustic
measurement tool, or if you have a fairly accurate voltmeter you can
disconnect one speaker terminal and measure the output after the
amplifier.


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