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Old 25th August 2009, 06:55 PM   #1
Tolu is offline Tolu  Germany
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Default PCM1793 DAC - a bargain?

Hi

after using the 1543DAC from QLSHIFI.com for 3 months I found the PCM1793 DAC on their site.

http://www.qlshifi.com/en/wzcapi/Mini1793.htm

The 1543DAC sounds good after some mods but compared to a PCM1607 or PCM56 or AK4396 it misses some details and dynamics.

Would it be an improvement to settle up to the PCM1793 DAC or is it (much) better to get a CS4398 DAC (gigawork) or PCM1798 DAC with tube output (qlshifi)?

The limit is about 200 US$. There are some DACs from renowned manufacturer that are in a comparable price area (DACmagic or V-DAC).
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Old 26th August 2009, 02:38 PM   #2
wwenze is offline wwenze  Singapore
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The DAC chip itself is not the sole determiner of acoustic performance, and the same DAC chips are used in many products. When comparing two DACs, you're comparing "a product based on TDA1543 IC" against "a product based on AK4396", and not TDA1543 vs AK4396. I wouldn't let the DAC chip hinder my decision as the analogue stage tends to affect the sound signature more.

Look at the site's NG98A/B for example - the AD1852 and CS4398 versions of the DAC sells for the same price. Really I don't see how a part costing less than $5 warrants a huge sway in price if the rest of the parts are identical.
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Old 28th August 2009, 05:06 AM   #3
Tolu is offline Tolu  Germany
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I have ordered it! Just to see if the DAC is different to the other fellows in my desk (PCM56, PCM61, PCM 1607,AK4396, TDA1543)!
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Old 28th August 2009, 05:21 AM   #4
ttan98 is offline ttan98  Australia
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Quote:
Originally Posted by Tolu View Post
Hi

PCM1798 DAC with tube output (qlshifi)?
I am getting a DAC based on PCM1798 similar to the one from qlshifi, except it has USB, Sdpif or Toslink input. I am buying directly from Mainland China hence cheaper too. I am waiting for it to arrive. I think the designer is the same as the one you mention from qlshifi. I don't think you can get this model from qlshifi.

Cheers.
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Old 17th September 2009, 01:07 PM   #5
jkeny is offline jkeny  Ireland
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Quote:
Originally Posted by ttan98 View Post
I am getting a DAC based on PCM1798 similar to the one from qlshifi, except it has USB, Sdpif or Toslink input. I am buying directly from Mainland China hence cheaper too. I am waiting for it to arrive. I think the designer is the same as the one you mention from qlshifi. I don't think you can get this model from qlshifi.
Tolu, ttan98, did you get your DAC? Any report on it - what price?

I'm experimenting with a PCM1793 & would appreciate any input you might have!.
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Old 17th September 2009, 02:52 PM   #6
ttan98 is offline ttan98  Australia
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Jkeny

Yes I just got my PCM1798 with spdif, usb and toslink inputs and valve output. The PCB and components are of very good quality. I bought mine from mainland china and cheaper. You can still buy directly from another outlet who accepts Paypal but you have to pay extra.

I have yet to solder in the components in and cannot report the sound quality, my soldering ability of SMD is next to none and I will spend sometime soldering them correctly.

If I start over again I will try using other chipsets, have a look at ready assembled boards based on oversampled chipset like AD1852(*), and non-oversampled chipset like AD1865(**)
If you refer chipset with 24bit and 192 bits/s sampling then look for AD1955. From what I read most users prefer AD1955 over the PCM1798. This is the conclusion I read after reading EXTENSIVELY reading on this forum and elsewhere.

* you can buy ready made boards and also off the shelf DAC based on this chipset. An example is china made DAC called Zero, costs about US$160 incl postage. Buy this and modify it to your hearts contend, eg add o/p transformer, valve, op amp, etc, much quicker then designing, constructing and testing it from scratch.
** this is preferred by Ciufolo from Audio design and Audionote.

Cheers have fun
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Old 17th September 2009, 07:54 PM   #7
Tolu is offline Tolu  Germany
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Hi Jkeny

the MiniDAC PCM1793 works good. It sounds very good (esp. for it's price). I just removed the OPA2134 and plugged in a LM4562. Not a big difference.
Sound is very clear and well defined. Very neutral!
The output stage is same like TI datasheet! Price was 55 Euro.

One shortfall: when there is no digital source locked to the receiver, the DAC puts out some ugly hiss.
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Old 15th July 2014, 07:50 AM   #8
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Quote:
Originally Posted by Tolu View Post
Hi Jkeny

the MiniDAC PCM1793 works good. It sounds very good (esp. for it's price). I just removed the OPA2134 and plugged in a LM4562. Not a big difference.
Sound is very clear and well defined. Very neutral!
The output stage is same like TI datasheet! Price was 55 Euro.

One shortfall: when there is no digital source locked to the receiver, the DAC puts out some ugly hiss.
I also noticed the hiss on my miniDAC when I received it the other day. Shouldn't this be handled by the DIR9001?
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Old 16th July 2014, 07:27 PM   #9
Tolu is offline Tolu  Germany
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Hi Michael

I think you can fix it when you connect a wire between error pin of DIR9001 and mute pin of DAC.

I changed the OPA2134 for a LM49720HA (metal can) that delivers marvellous results.

And use a linear Power supply.
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Old 16th July 2014, 08:15 PM   #10
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Thank you for the suggestion. I was actually planning to do just that. I was reading the datasheet for both DIR9001 and PCM1793 and when I realized the unlock led was off when there was a valid signal I realized I could use that to mute the DAC when the unlock led was on.
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