Theta Digital DSPRO Gen V?

jstang · 31st August 2012, 05:22 PM

Any thoughts on this DAC...? Theta Digital DSPRO Gen V. Seems to have been a vey high end unit and still highly valued.....

johnk

abraxalito · 1st September 2012, 02:09 AM

From reading the Theta legacy pages it has PCM63 DACs - very highly regarded by people seeking a more analog sound from their digital kit. Can't work out though whether the output stage is still AD841 or discrete. If the former then it was an excellent choice at the time but parts with better dynamic performance are available now.

Phisci · 3rd September 2012, 09:46 AM

Very good DAC.
PCM63x 2 per channel.
Output stage after DAC is fully discrete Class A bipolar tramsistor stage. No caps in signal path.
Input stage uses CS8412 and a bunch of digital processing chips (reclocking, etc).
True balanced and single-ended outputs.
Can be upgraded by using low noise power supplies to PCM63.

jstang · 6th September 2012, 03:37 AM

Picked it up for 100$ us not working....

Replaced a shorted tantalum and the dac chips.... Sounds very nice but seems to be lacking some bass. I added a toslink to it also, seeing this is a second dac I like tos to prevent noise being sent back to my cdpro drive.

Need to test it for freq response. And then I will recap it.

It weights 40 pounds.....those dang tantalums are really heavy....

Johnk

31st August 2012, 05:22 PM	#1
jstang diyAudio Member Join Date: Jun 2008	Theta Digital DSPRO Gen V? Any thoughts on this DAC...? Theta Digital DSPRO Gen V. Seems to have been a vey high end unit and still highly valued..... johnk

1st September 2012, 02:09 AM	#2
abraxalito diyAudio Member Join Date: Sep 2007 Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though... Blog Entries: 62	From reading the Theta legacy pages it has PCM63 DACs - very highly regarded by people seeking a more analog sound from their digital kit. Can't work out though whether the output stage is still AD841 or discrete. If the former then it was an excellent choice at the time but parts with better dynamic performance are available now. __________________ When a measure becomes a target, it ceases to be a good measure. C.A.E. Goodhart

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3rd September 2012, 09:46 AM	#3
Phisci diyAudio Member Join Date: Aug 2012	Very good DAC. PCM63x 2 per channel. Output stage after DAC is fully discrete Class A bipolar tramsistor stage. No caps in signal path. Input stage uses CS8412 and a bunch of digital processing chips (reclocking, etc). True balanced and single-ended outputs. Can be upgraded by using low noise power supplies to PCM63.

6th September 2012, 03:37 AM	#4
jstang diyAudio Member Join Date: Jun 2008	Picked it up for 100$ us not working.... Replaced a shorted tantalum and the dac chips.... Sounds very nice but seems to be lacking some bass. I added a toslink to it also, seeing this is a second dac I like tos to prevent noise being sent back to my cdpro drive. Need to test it for freq response. And then I will recap it. It weights 40 pounds.....those dang tantalums are really heavy.... Johnk