# Cannot Acces DAC through USB port on Core

**URL:** <https://community.roonlabs.com/t/cannot-acces-dac-through-usb-port-on-core/96092>\
**Category:** Support\
**Created:** [February 27, 2020, 4:42pm UTC](https://community.roonlabs.com/t/cannot-acces-dac-through-usb-port-on-core/96092 "2020-02-27T16:42:05Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Matt\_Martin](https://community.roonlabs.com/letter_avatar/matt_martin/32/5_5575768a8748004e209b776fc1b2916d.png) [@Matt\_Martin](https://community.roonlabs.com/u/Matt_Martin)\
**Post date:** [February 27, 2020, 4:42pm UTC](https://community.roonlabs.com/t/cannot-acces-dac-through-usb-port-on-core/96092/1 "2020-02-27T16:42:05Z")

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**Core Machine (Operating system/System info/Roon build number)**

|[Quiet PC UltraNUC Pro 7 Fanless]  
||- Plato X7D Slim Fanless NUC Chassis||  
||- 7th Gen NUC Core i7-8650U, NUC7i7DNKE, M.2 Drive||  
||- Vengeance 8GB (2x4GB) DDR4 SODIMM 2400MHz Memory||  
||- WD Green 120GB M.2 SATA SSD (545/465)||  
|| 960GB, KINGSTON SA400S3

Rock Version 1.0 (build 183) stable  
Roon V1.7 B521

**Network Details (Including networking gear model/manufacturer and if on WiFi/Ethernet)**

Cable Ethernet 1’000 MB  
AVM Fritzbox 5490 (Fibre)

**Audio Devices (Specify what device you’re using and its connection type - USB/HDMI/etc.)**

Pro-Ject DAC Box S2+, through USB port on Core

**Description Of Issue**  
Just returned from one week of holidays, rebooted the Core annmd the DAC. Was prompted to upgrade to 521.  
Since upgrading to B521 I cannot access the DAC via USB on the Core.  
“unexpected error commuinicating with audio device / too many failures stopping playback”

The USB port ( and DAC) shows up in the Settings/Audio/Core section in the Settings on the Roon remote app. It disappears as soon as I plug ouit the USB cable and reappears after pluggin in.

Tried rebooting Core, tried reinstalling Rock, no effect.

Playback to networked devices (Squeezeboxes, HiFIBerry) do work.

Please advise.

Martin

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<div class="post-metadata">

**Author:** ![Matt\_Martin](https://community.roonlabs.com/letter_avatar/matt_martin/32/5_5575768a8748004e209b776fc1b2916d.png) [@Matt\_Martin](https://community.roonlabs.com/u/Matt_Martin)\
**Post date:** [February 27, 2020, 5:03pm UTC](https://community.roonlabs.com/t/cannot-acces-dac-through-usb-port-on-core/96092/2 "2020-02-27T17:03:13Z")

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I fiddled with the device settings.

It works when I set DSD Playback Strategy to “convert to PCM”. It does not work when I set it to “DSD over PCM”.

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**Author:** ![BlackJack](https://community.roonlabs.com/user_avatar/community.roonlabs.com/blackjack/32/39743_2.png) [@BlackJack](https://community.roonlabs.com/u/BlackJack)\
**Post date:** [February 27, 2020, 5:10pm UTC](https://community.roonlabs.com/t/cannot-acces-dac-through-usb-port-on-core/96092/3 "2020-02-27T17:10:20Z")

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Do you use Speaker Setup?

> [@DSD Playback Fails when using Speaker Setup DSP](https://community.roonlabs.com/t/dsd-playback-fails-when-using-speaker-setup-dsp/95353):
>
> Core Machine (Operating system/System info/Roon build number) Debian Stretch, AMD v1000 1.7 (build 521) stable Network Details (Including networking gear model/manufacturer and if on WiFi/Ethernet) SMC NETWORK GS8P - Wired Audio Devices (Specify what device you’re using and its connection type - USB/HDMI/etc.) Roon Bridge 1.0 (171) USB vs. Nuprime DAC-10 Description Of Issue After Roon Server Update the activation of DSP Speaker Setup cause this issue… 02/21 15:04:08 Warn: [zoneplayer]…

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<div class="post-metadata">

**Author:** ![Matt\_Martin](https://community.roonlabs.com/letter_avatar/matt_martin/32/5_5575768a8748004e209b776fc1b2916d.png) [@Matt\_Martin](https://community.roonlabs.com/u/Matt_Martin)\
**Post date:** [February 27, 2020, 5:29pm UTC](https://community.roonlabs.com/t/cannot-acces-dac-through-usb-port-on-core/96092/4 "2020-02-27T17:29:01Z")

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Yes I do.  
Removed it, now DSD works again.

Thanks. In my configuration DSD sounds so much better than PCM 🙂

Martin

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<div class="post-metadata">

**Author:** ![system](https://roon-community-uploads.s3.amazonaws.com/original/3X/d/e/deefbd9083c99c82bbf2dd3f873f52a49f5db881.png) [@system](https://community.roonlabs.com/u/system)\
**Post date:** [February 29, 2020, 5:29am UTC](https://community.roonlabs.com/t/cannot-acces-dac-through-usb-port-on-core/96092/5 "2020-02-29T05:29:02Z")

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