Pcm1700

iMac · 12th August 2010, 07:32 AM

Is this any good DAC or not?

Don't find much then I google it or search here..

novec · 14th August 2010, 08:17 PM

It's 20 years old, so I'd go for something else.

iMac · 15th August 2010, 08:47 AM

It's stuck in a Tandberg TCP-4035 with a DF1700P

I'm more interesting in any opinion about this DAC (it's a BB), yes it's old but someone must have listen to it in any DAC or player?

Is there any quick and easy way to change it to a NOS? Don't want to do any big changes so I cant change it back again..

abraxalito · 15th August 2010, 09:00 AM

Quote:

Originally Posted by iMac

Is this any good DAC or not?

Its pants - really bad glitch at the zero crossing. It sounded so bad that a colleague who designed an 8 channel output board with it redesigned the board to use another part.

iMac · 15th August 2010, 09:54 AM

Quote:

Originally Posted by abraxalito

Its pants

Sorry haven't heard that expression before.. Learning something new every day

Quote:

Originally Posted by abraxalito

- really bad glitch at the zero crossing. It sounded so bad that a colleague who designed an 8 channel output board with it redesigned the board to use another part.

How did it sound, what was the "pants"? Do you know if he used the MSB adjustment in the design?

abraxalito · 15th August 2010, 09:59 AM

I wasn't working on that particular project myself, so didn't get to listen to it. Just heard from one guy who was more of a 'golden ear' than the engineers that it was gritty. I did look on the scope and found the zero crossing glitch was seriously bad - guess it sounded like an amp with very bad crossover distortion - horribly harsh at lower levels.

Yes I think he did include the MSB trim pots and no, they didn't rescue the sound. They only affect the high level distortion.

iMac · 15th August 2010, 10:18 AM

Do you know at what level and fq that the zero crossing glitches was seriously bad?

abraxalito · 15th August 2010, 10:24 AM

Zero crossing glitches are by definition at zero crossing - meaning the lowest level - where positive and negative signals meet. What's fq?

Bernhard · 15th August 2010, 10:45 AM

Quote:

Originally Posted by abraxalito

Yes I think he did include the MSB trim pots and no, they didn't rescue the sound. They only affect the high level distortion.

MSB affects everything but mostly low level distortion.

Glitch has nothing to do with distortion, glitch is when two switching devices overlap for a short time.

iMac · 11:04 AM

fq = frequency

I got at CD with 1kHz test tone starting at -120dB, -110 and so on(dither and no dither), will I see the crossing distortion with this test tone and a oscilloscope?

12th August 2010, 07:32 AM	#1
iMac diyAudio Member Join Date: Sep 2005	Pcm1700 Is this any good DAC or not? Don't find much then I google it or search here..

15th August 2010, 08:47 AM	#3
iMac diyAudio Member Join Date: Sep 2005	Tandberg TCP-4035 It's stuck in a Tandberg TCP-4035 with a DF1700P I'm more interesting in any opinion about this DAC (it's a BB), yes it's old but someone must have listen to it in any DAC or player? Is there any quick and easy way to change it to a NOS? Don't want to do any big changes so I cant change it back again..

15th August 2010, 09:59 AM	#6
abraxalito diyAudio Member Join Date: Sep 2007 Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though... Blog Entries: 46	I wasn't working on that particular project myself, so didn't get to listen to it. Just heard from one guy who was more of a 'golden ear' than the engineers that it was gritty. I did look on the scope and found the zero crossing glitch was seriously bad - guess it sounded like an amp with very bad crossover distortion - horribly harsh at lower levels. Yes I think he did include the MSB trim pots and no, they didn't rescue the sound. They only affect the high level distortion. __________________ I think ideas are what you want to get rid of. I don't really like songs with ideas. - Leonard Cohen

15th August 2010, 10:24 AM	#8
abraxalito diyAudio Member Join Date: Sep 2007 Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though... Blog Entries: 46	Zero crossing glitches are by definition at zero crossing - meaning the lowest level - where positive and negative signals meet. What's fq? __________________ I think ideas are what you want to get rid of. I don't really like songs with ideas. - Leonard Cohen

15th August 2010, 10:49 AM	#10
iMac diyAudio Member Join Date: Sep 2005	fq = frequency I got at CD with 1kHz test tone starting at -120dB, -110 and so on(dither and no dither), will I see the crossing distortion with this test tone and a oscilloscope? Last edited by iMac; 15th August 2010 at 11:04 AM.


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14th August 2010, 08:17 PM	#2
novec diyAudio Member Join Date: Aug 2005	It's 20 years old, so I'd go for something else.

15th August 2010, 10:18 AM	#7
iMac diyAudio Member Join Date: Sep 2005	Do you know at what level and fq that the zero crossing glitches was seriously bad?

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