Hailey Posted July 23, 2016 Share Posted July 23, 2016 So the mother of all posts about rebuilding the Mac Mini ( Mac Mini version of a CAPS music server - Step by Step ) makes a rather general nod toward shielding more or less everything. But what exactly does that mean? Does anyone know? Shield with what? Where? How much? Oh, and what about heat? Any thoughts? Anyone? Link to comment
PieterP Posted July 24, 2016 Share Posted July 24, 2016 I am also interested to know more about shielding emi rfi. I build my own pc based streamer with 3 LPS for the mobo (asrock q1900 itx), ssd (samsung evo) and paul pang usb v2 card. The lps have their own part in my streamer, separated by a steel and copper plate from the mobo etc. Questions i have: why do you need to shield, what to shield (which IC's, memory,.....) and with what material? Sent from my SM-T580 using Computer Audiophile mobile app Link to comment
Hailey Posted July 24, 2016 Author Share Posted July 24, 2016 Perhaps I should have posted this in another forum. The server forum seems a bit quiet... Link to comment
vladimirb0b Posted July 24, 2016 Share Posted July 24, 2016 There is a lot of information out there to be googled. Most (any?) metal can reduce EMI and RFI... RFI just being the subset of EMI that is radio waves. As far as heat, you can leave holes in the material. The hole size depends on the EM waves you want to get through, following the equation speed of light = frequency * wavelength. Put a screen over the holes if they are too big. To reduce magnetics you need something that reduces magnetics (duh). Something like copper or mumetal but not aluminum. Search the web for more information...After search post remaining questions at diyaudio.com and you should get some good advice Link to comment
vladimirb0b Posted July 24, 2016 Share Posted July 24, 2016 Also: your EMI blocker would act like a Faraday Cage, and I *think* thickness doesn't really matter. It could just be a metal mesh that you place around the mini. As far as magnetics, I gather that thickness does make a difference. Anyone correct if I am wrong. Link to comment
Hailey Posted July 24, 2016 Author Share Posted July 24, 2016 There is a lot of information out there to be googled. Most (any?) metal can reduce EMI and RFI... RFI just being the subset of EMI that is radio waves. As far as heat, you can leave holes in the material. The hole size depends on the EM waves you want to get through, following the equation speed of light = frequency * wavelength. Put a screen over the holes if they are too big. To reduce magnetics you need something that reduces magnetics (duh). Something like copper or mumetal but not aluminum. Search the web for more information...After search post remaining questions at diyaudio.com and you should get some good advice Thanks. Helpful start. Link to comment
PieterP Posted July 24, 2016 Share Posted July 24, 2016 Yes thanks vladimirb0b Sent from my SM-T580 using Computer Audiophile mobile app Link to comment
amgradmd Posted August 3, 2016 Share Posted August 3, 2016 So the mother of all posts about rebuilding the Mac Mini ( Mac Mini version of a CAPS music server - Step by Step ) makes a rather general nod toward shielding more or less everything. But what exactly does that mean? Does anyone know? Shield with what? Where? How much? Oh, and what about heat? Any thoughts? Anyone? I don't know about modifying the Mac Mini to reduce RF/EMI. Any CPU will be a somewhat noisy environment for audio out. Some more than others, of course. What I've done, which seems to work perfectly, is use a device PS Audio just came out called the LANRover which gets rid of a lot EMI/RF noise and can allow you to furthermore separate the CPU from the rack by converting USB signal to ethernet through a sending LANRover unit. This can then be sent over a router to the receiving LANRover unit connected to the DAC with another USB cable. The improvement was not subtle. From what I understand, people are getting better sound with this device than Uptone Audio Regen. A microRendu may be another option, which people swear by. You may want to look into that instead of hacking apart your Mini. Just a thought. Link to comment
tranz Posted August 3, 2016 Share Posted August 3, 2016 I threw the kitchen sink at the Mac Mini including separate enclosures, 3M absorbers, alu foil, etc. In the end I could not get it to sound as I wanted. Too fatiguing. Not until, and what the above post also mentions, you separate the computer from the DAC will it sound good. MicroRendu, optical LAN, renderer are good options. Also do not have the computer on the same AC drop as your DAC and amps. Those are better places to spend money than to try and optimize the mac. Link to comment
Hailey Posted August 3, 2016 Author Share Posted August 3, 2016 What I've done, which seems to work perfectly, is use a device PS Audio just came out called the LANRover which gets rid of a lot EMI/RF noise and can allow you to furthermore separate the CPU from the rack by converting USB signal to ethernet through a sending LANRover unit. This can then be sent over a router to the receiving LANRover unit connected to the DAC with another USB cable. The improvement was not subtle. From what I understand, people are getting better sound with this device than Uptone Audio Regen. A microRendu may be another option, which people swear by. You may want to look into that instead of hacking apart your Mini. Just a thought. Thanks, I'll check out the LANRover. Wouldn't that conversion, reconversion induce additional jitter or what-have-you? Link to comment
One and a half Posted August 4, 2016 Share Posted August 4, 2016 Thanks, I'll check out the LANRover. Wouldn't that conversion, reconversion induce additional jitter or what-have-you? If the regualr Icron products (the Lanrover is an OEM product from Icron) behave the way they usually do, the transmission system is transparent. AS Profile Equipment List Say NO to MQA Link to comment
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