Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Digital Line Level DACs, Digital Crossovers, Equalizers, etc.

MiniDSP 8x8 in 1U Rack Enclosure
MiniDSP 8x8 in 1U Rack Enclosure
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 5th February 2020, 12:31 PM   #1
grahamgraham is offline grahamgraham  United Kingdom
diyAudio Member
 
grahamgraham's Avatar
 
Join Date: Oct 2016
Location: London
Default MiniDSP 8x8 in 1U Rack Enclosure

Hi all!

I wonder if anyone might be able to answer what might be a couple of daft questions about putting my 8x8 in a metal rack case.

My 8x8 has been sat on my shelf working for a year now and I've had issues with noise from my computer getting through to the audio. I hear discs spinning up and a ground loop whine. I thought the next step in solving this problem is to case up the MiniDSP and eliminate potential causes one by one. So...


1. When I mount the board to the case do I want to use metal hardware to couple the board to the metal for shielding?


2. If I do the above can I mount the DC power socket straight in to the metal without isolating it?


3. Are there any recommended things I should do in the process of what is seemingly a simple mounting?


This is the case I have ordered:
https://cpc.farnell.com/penn-elcom/r...-me-pd-mi-alte


Cheers!


http://www.minidsp.com/images/docume...r%20Manual.pdf
  Reply With Quote
Old 5th February 2020, 12:37 PM   #2
tommus is offline tommus  United States
diyAudio Member
 
Join Date: Jul 2009
start here!

Audio Component Grounding and Interconnection - diyAudio

Last edited by tommus; 5th February 2020 at 12:38 PM. Reason: clarity
  Reply With Quote
Old 9th February 2020, 02:52 AM   #3
Rick PA Stadel is offline Rick PA Stadel  United States
diyAudio Member
 
Join Date: Apr 2017
Location: greater Kansas City
Sure hope a properly grounded case solves all your problems, but ...

The disk-spin-up and whine sounds are, unfortunately, fairly common among certain lines of laptops and even some desktops. One of my favorite older units was incorrigible -- even with isolation transformers -- yet played fine just by unplugging the power brick and running on the internal battery.

Cheers
  Reply With Quote
Old 11th February 2020, 07:21 AM   #4
Fenalaar is offline Fenalaar  Norway
diyAudio Member
 
Join Date: Apr 2011
Minidsp has availble a ready-made all-steel enclosure for the 8x8.

Enclosures : miniDSP 2x8/8x8 Box

You might want to consider getting a toslink for you PC, and connect your pc through an optical cable. USB Audio Streaming : USBStreamer Kit

Johan-Kr

Last edited by Fenalaar; 11th February 2020 at 07:24 AM.
  Reply With Quote
Old 11th February 2020, 09:37 AM   #5
grahamgraham is offline grahamgraham  United Kingdom
diyAudio Member
 
grahamgraham's Avatar
 
Join Date: Oct 2016
Location: London
Quote:
Originally Posted by tommus View Post
Thanks, man. SO, signal ground and power ground need to stay separate? UNfortunately the MiniDSP mixes the two from continuity testing. Is there anything I can do?


Quote:
Originally Posted by Rick PA Stadel View Post
Sure hope a properly grounded case solves all your problems, but ...

The disk-spin-up and whine sounds are, unfortunately, fairly common among certain lines of laptops and even some desktops. One of my favorite older units was incorrigible -- even with isolation transformers -- yet played fine just by unplugging the power brick and running on the internal battery.

Cheers
Yes, it's very frustrating. I might at some point move the an SSD to eliminate just one of the noises!

Quote:
Originally Posted by Fenalaar View Post
Minidsp has availble a ready-made all-steel enclosure for the 8x8.

Enclosures : miniDSP 2x8/8x8 Box

You might want to consider getting a toslink for you PC, and connect your pc through an optical cable. USB Audio Streaming : USBStreamer Kit

Johan-Kr
Yes, I definitely have and will be looking to do that. I need the Digi-FP module for input and I can take TOSlink out of my Xonar U5. It's a shame I can't get 8 digital inputs in to the 8x8 board for my surround!
  Reply With Quote
Old 12th February 2020, 01:12 PM   #6
KaffiMann is offline KaffiMann  Norway
Fanatic
diyAudio Member
 
KaffiMann's Avatar
 
Join Date: Sep 2009
Location: Grua, not far from Oslo.
MiniDSP 8x8 in 1U Rack Enclosure
USB soundcard and USB isolator.
Hifime High-Speed USB Isolator
__________________
Things are starting to happen, work in progress: https://kaffimann.com

Last edited by KaffiMann; 12th February 2020 at 01:14 PM.
  Reply With Quote
Old 12th February 2020, 07:05 PM   #7
grahamgraham is offline grahamgraham  United Kingdom
diyAudio Member
 
grahamgraham's Avatar
 
Join Date: Oct 2016
Location: London
Quote:
Originally Posted by KaffiMann View Post
USB soundcard and USB isolator.
Hifime High-Speed USB Isolator
I have a dc-dc isolator between the usb power lines of my computer and the sound card. The screen is still connected. One of these:

TBA 2-0511 | TRACOPOWER TBA 2 2W Isolated DC-DC Converter Through Hole, Voltage in 4.5 → 5.5 V dc, Voltage out 5V dc | RS Components

Does the unit you have linked offer any extra isolation? Cheers for the suggestion.

Last edited by grahamgraham; 12th February 2020 at 07:08 PM.
  Reply With Quote
Old 12th February 2020, 07:08 PM   #8
grahamgraham is offline grahamgraham  United Kingdom
diyAudio Member
 
grahamgraham's Avatar
 
Join Date: Oct 2016
Location: London
I've not done any metal work like this before and I cocked up the holes for the rca sockets so badly I had to cut a much wider hole for the Phoenix connectors as well.

Have I ruined all screening properties that the case will give me with these wide holes?
Attached Images
File Type: jpg 20200212_180150.jpg (543.7 KB, 39 views)
  Reply With Quote
Old 14th February 2020, 07:10 AM   #9
KaffiMann is offline KaffiMann  Norway
Fanatic
diyAudio Member
 
KaffiMann's Avatar
 
Join Date: Sep 2009
Location: Grua, not far from Oslo.
MiniDSP 8x8 in 1U Rack Enclosure
Quote:
Originally Posted by grahamgraham View Post
Does the unit you have linked offer any extra isolation?
It's not only the power that's "dirty" on a computer, the noise seeps into the data bus as well.
It's not always the right solution, but I haven't used a PCI slot soundcard for well over a decade because of all the noise inside PC's.
Just sayin' it's hard to deal with, so part of my solution is using external solutions with balanced interconnects. Much better now, but seems there's always another step to do in the battle against noise.
__________________
Things are starting to happen, work in progress: https://kaffimann.com
  Reply With Quote

Reply


MiniDSP 8x8 in 1U Rack EnclosureHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
5u rack/enclosure JaredC79 Swap Meet 3 6th April 2017 05:21 AM
Redco 1U Rack Enclosure miallen Parts 1 12th May 2015 04:34 PM
Mounting PCBs in Rack Enclosure miallen Parts 6 27th April 2015 08:33 AM
Elma type 15 classic rack enclosure 6U boywonder Swap Meet 3 26th May 2009 01:16 AM
Hammond Rack Mount Enclosure Peter Menting Swap Meet 0 19th July 2006 02:22 PM


New To Site? Need Help?

All times are GMT. The time now is 02:25 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Copyright ©1999-2020 diyAudio
Wiki