Twisted Pear Audio Opus DAC - Page 66

Quote:

Originally Posted by iamthecheese 

Another thing, is it possible to run an opus module, metronome and spdif receiver from a single LCDPS?

 

Also how would IVY'(s) be wired for a dual mono setup? Would I even need two? I looked around and saw some people using 1 or 2 ivys for dual mono.

Yes, you can run OPUS, Metro and SPDIF receiver out of a single LCDPS. One side powers the digital section of OPUS, Metro and SPDIF board, the other side of LCDPS powers the analog section of OPUS

I would recommend that you get the basic set up running first (SPDIF receiver and OPUS) and then add the other components later to facilitate debugging in case you have problems

I'm looking into building an OPUS as a summer project. Just a non-balanced one, I don't really plan on going balanced anytime soon, too expensive :(  I've built a MSSH and a bottlehead crack so far. 

Getting kind of confused as to what exactly I have to buy to build it lol. Do I just need the OPUS kit (unassembled), USB receiver module, and then a powersupply option? And of course a case.

Is there large difference between the placid powersupply kit and just the low current dual powersupply? 

This is the most recent thread I could find on the opus dac, I've read a bit here and the diy forum, but I can't really be sure.  I'm currently using a laptop that would either have to be usb out or headjack to rca.  I'd like to be able to use optical or coax in the future.  Would this be a good pairing w/ an indeed G3?

here's the reply I got from their forum

The Opus is basically just the DAC by itself and it has balanced output. If you want to get SE output you will need to either get the following:

Ballsie Lite Converter

Or Line stage with built in Ballsie

IVY

Even if you're going to go fully balanced, I would suggest you get the IVY board, it is much better for sound output.

You will need a power supply for the DAC. Depending on your budget, you can go these way. Upper is least expensive solution and lower is most expensive but better as well

1- Use LCDPS power supply to power analog and digital sections of the DAC independently or use one side of the LCDPS to power both analog/digital section of the DAC and the other side of the LCDPS to power the SPDIF tranceiver/MUX/USB

2- Use a Placid HD power supply to power both the analog/digital section of the DAC or use two of them to power them individually. Use LCDPS to power the SPDIF tranceiver/MUX/USB and use a Placid HD Bipolar Shunt power supply to power the IVY stage

3- Use any combination you like but the Placid HD Shunt power supplies are the best to power the DAC and IVY Stage. The tranceiver/mux/usb can all be powered by LCDPS.

If I was going to build this, I would use the following:
Opus DAC
Placid HD Shunt to power both Analog/Digital section of the DAC
IVY III Linestage
Placid HD Bipolar Shunt Power Supply for IVY III
Your choice of tranceiver/mux/USB
SPDIF tranceiver with I2S output
or
4:1 Mux receiver with I2S output (new version coming out soon...
or
USB receiver with I2S output (new version coming out soon...)

And of course transformers
Power transformers
You can use the 15V for DAC and IVY and Transceiver/MUX/USB. The 9V should also work well with the DAC and Tranceiver but not the IVY

Enjoy!

he could also use a pair of line transformers for bal/se conversion, in fact the opus and all voltage out dacs pretty much, works very well with this setup. you do not need an IV stage, so i would suggest getting the ivy is overkill. a simple jfet or mosfet differential pair for a buffer would also do the job nicely

Why does their SPDIF receiver have 4 I2S options while their current USB receiver only allow 24 bit I2S? Shouldn't the USB receiver just allow I2S and 16 bit or 24 bit depending on the source?

If you play a 16 bit music file from the source to the SPDIF receiver using 16 bit I2S it seems to sound better than 24 bit I2S I think although I also configured my Metronome and my Dual Mono Opus DAC in differential mode to 16 bit too.

Does anyone else have this setup and tried doing this?

In their manuals they keep asking you to set it up for 24 bit but it doesn't make sense if you don't usually play 24 bit files.

standard pcm i2s does not come in 16bit flavor, only philips and perhaps sony format. all it does when feeding a 16bit signal to a 24 or 32bit dac with pcm input is pad the other bits with zeros. it doesnt resample unless you use metronome or similar afaik

http://www.ti.com/lit/ds/symlink/pcm2707.pdf

I stand corrected, although thats not pcm, probably as long as its msb justified its ok

TPA has a USB receiver that uses bus power and I'm looking for a USB receiver out there that uses an external power supply so I'm wondering if anyone else know a USB receiver like this or already using one in their TPA DAC configuration?

I'm looking for a non-TPA USB receiver that works in an TPA Opus DAC configuration that can run on TPA's LCDPS. Please let me know what's out there.

Will the Opus and associated components be offered for sale again? Right now, every offering is 'out of stock'. It has the look of a dead product line, but there's no such annotation on the web site.

Quote:

Originally Posted by Gliding 

Will the Opus and associated components be offered for sale again? Right now, every offering is 'out of stock'. It has the look of a dead product line, but there's no such annotation on the web site.

"The Opus DAC is undergoing a redesign, and should be available again in early-2012."

Source: http://www.twistedpearaudio.com/digital/opus.aspx