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Old 17th January 2005, 10:09 PM   #1
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Default New DAC measurement

Hi,

not want to torture U, but here an overview of DACs I have in my players.

All same scale and level on K3 referenced to -60dB 1kHz signal.

What I can say is that, compared to 16 bit, 18 & 20 bit does not perform better in distortion, only in noise.
Thus distortion becomes even more noticeable.

Start is PCM64 with optimum distortion adjustment made with multiturn pot in Denon DCD1520.

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Old 17th January 2005, 11:06 PM   #2
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My precious:

A no grade PCM56, one of the best out of 50 tested chips of all grades, in Denon DCD 1500mkII, also with optimum distortion adjustment made with multiturn pot.

No harmonics visible.

K3 for example is 6 or more dB better compared to the PCM64.

Others PCM56 chips look very ugly, even K grades.

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Old 18th January 2005, 11:02 PM   #3
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TDA1541 one channel in a Philips CD960:

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Old 18th January 2005, 11:04 PM   #4
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Other channel:

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Old 18th January 2005, 11:16 PM   #5
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My second CD960: Direct comparison of both channels.

This one is unmodded with NE5534 while the first one had 4 x Burr Brown OPA627 & foil coupling caps at the output.

Note that in both players ( chips ) distortions of channels are totally different, good for soundstage ???

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Old 23rd January 2005, 09:42 AM   #6
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PD2028A, Pioneer bitstream DAC in a Pioneer PD75.
Best so far

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Old 23rd January 2005, 09:49 PM   #7
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Another bitstream DAC: TDA1547, 1 chip per channel in ONKYO 6890.
Also very good

I once had a Marantz player with SAA???? bitstream DAC, that was bad...

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Old 8th February 2005, 10:07 PM   #8
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Now a real state of the art DAC

TDA1540 14bit

Note the subharmonic @ 650 Hz.

Both channels are absolutely identical what is not the case with TDA1541.

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Old 8th February 2005, 10:29 PM   #9
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PCM63-K2 in a Pioneer PD8500.
Not very impressing, original J grade chips looked similar.

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Old 8th February 2005, 10:32 PM   #10
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Other channel:

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