Ultra High Sample Rates on the Rendu Series

I'm starting this thread to share some feedback from customers regarding ultra high sample rates on the rendu. I thought I had a database but I can't find it. If I find my database I'll share it here. Please provide your feedback as I can't test these rates in house. 

This information was sent by a customer. Not sure what DAC was used:

On 5/4/2024 at 2:21 PM, vortecjr said:

I'm starting this thread to share some feedback from customers regarding ultra high sample rates on the rendu. I thought I had a database but I can't find it. If I find my database I'll share it here. Please provide your feedback as I can't test these rates in house. 

 

This information was sent by a customer. Not sure what DAC was used:

 

No playback issues at all. I’ll con

DSD1024:

 

 

PCM 32 bit / 1,536 kHz:

 

Your images aren’t being displayed.

It's been fixed now. 

I can get high rate 1411 or 1536 PCM using HQPlayer Windows software to an UltraRendu running NAA 5.0.0 which is connected to a Denafrips Pontus II dac.

DSD 1024 works as well but I prefer PCM to the Denafrips dac.

On 5/14/2024 at 9:01 AM, dknk said:

I can get high rate 1411 or 1536 PCM using HQPlayer Windows software to an UltraRendu running NAA 5.0.0 which is connected to a Denafrips Pontus II dac.

DSD 1024 works as well but I prefer PCM to the Denafrips dac.

This is one of the devices I get a bunch of emails about. Are you using 19 bits?

1 hour ago, vortecjr said:

Are you using 19 bits

The PCM ladder linearity measurement is around 20 bit, similar to the Holo dacs. Miska's (Jussi) advice is to set the Dac bits to 20 in HQP config or 1 or 2 less but not more. This HQP setting applies only to PCM output, it's not used for SDM output.

20 hours ago, dknk said:

The PCM ladder linearity measurement is around 20 bit, similar to the Holo dacs. Miska's (Jussi) advice is to set the Dac bits to 20 in HQP config or 1 or 2 less but not more. This HQP setting applies only to PCM output, it's not used for SDM output.

Thats interesting...thanks for sharing this. 

My new opticalRendu Deluxe-new version can playback 1024 DSD and 1.536l PCM. After about 20 minutes playback stops. Roon displays “Roon lost control of Audio Device”, In the HQPlayer log file the first entry at the time playback stopped is “NAA output network timeout”. Clicking on Play restarts playback. After several cycles of stop and restart, the audio becomes distorted, not dropouts.  

Do you have a paid license of HQ Player? Is the unit heating up excessively?

I do have a paid license for my HQPlayer. The case of the unit fells warm but not excessively hot. I do suspect heat does have something to do with what is going on. The playback stops and distortion takes longer to begin if I leave the unit un-powered overnight than when the unit is powder overnight.

The unit is on a cabinet top with unrestricted ventilation on all sides. The unit is in an air conditioned room, the current temp is 75 F. and 1024 DSD and 1,5361 PCM audio are both distorted. Playback at lower bit rates is undistorted. Input to the unit is 7 VDC.

1 hour ago, JohnDonaldson said:

I do have a paid license for my HQPlayer. The case of the unit fells warm but not excessively hot. I do suspect heat does have something to do with what is going on. The playback stops and distortion takes longer to begin if I leave the unit un-powered overnight than when the unit is powder overnight.

The unit is on a cabinet top with unrestricted ventilation on all sides. The unit is in an air conditioned room, the current temp is 75 F. and 1024 DSD and 1,5361 PCM audio are both distorted. Playback at lower bit rates is undistorted. Input to the unit is 7 VDC.

 

I may be able to send you a heat synk to place over the CPU as a test. Email me at [email protected]