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USB isolators (filters) for audio: passive or active
USB isolators (filters) for audio: passive or active
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Old 22nd May 2020, 02:22 PM   #1
KHashmi316 is offline KHashmi316  United States
diyAudio Member
 
Join Date: Oct 2006
Default USB isolators (filters) for audio: passive or active

There are several types of these "thumbdrive"-like devices avail.
Some are dedicated (and $$) audiophile products, like:
AudioQuest Jitter Bug (this is passive):
Click the image to open in full size.
Click the image to open in full size.

And there are "active" devices for audio:
HiFimeDIY USB Isolator -- USD29.99
Click the image to open in full size.
Click the image to open in full size.

HiFimeDIY state that:
Quote:
ADUM4160 Support USB “full speed” 12Mbit/s, but not “high speed” 480 Mbit/s.
Support USB “Low speed” 1.5Mbit/s (internal switch needs to be set to L). – Alternatively look here for the hi-speed version
So they suggest their $100 "Hifime High-Speed USB Isolator version" for "hi-speed" because:
Quote:
If you have tried our USB isolator in the past and found it wasn’t compatible with your equipment, then there is a very good chance that the new High-Speed isolator will work. It supports all USB transfer modes, Low (1.5Mbps), Full (12Mbps) and Hi-speed (480Mbps). Hi-Speed 480Mbps are required by DACs that support higher than 96kHz/24bit sample rates, and also multi channel DACs.
The new isolator also provides more power, 400mA to the connected device, vs 200mA from the other USB isolator.
====================

The following are generic USB filters (not necess. audio) :

HiLetgo ADUM3160 B0505S 1500V USB to USB Voltage Isolator Module Support 12Mbps 1.5Mbps --- $15.00 USD
Click the image to open in full size.

diymore 1500V USB to USB Isolator Board Protection Isolation ADUM4160 ADUM3160 Module -- $15.00USD
Click the image to open in full size.

=========
Say your primary source for audio is a laptop. Nothing special.

Would you select any one of these for your USB dac? Why or why not? And how important (to audio) is speed and active vs. passive?

Suggest some alternatives.

Thanks!
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Old 22nd May 2020, 02:26 PM   #2
KHashmi316 is offline KHashmi316  United States
diyAudio Member
 
Join Date: Oct 2006
For example, assume this is your DAC:
Hifime S2 - USB DAC with Sabre ES9038Q2M ($90usd)
You can clearly see what a stock DAC is filtering by itself. And what the company selling it is trying to sell AGAIN to you (see above post) to "upgrade" it's sound.
Note the price of the DAC ($90usd) vs. the "upgrade" ($30-100).

Click the image to open in full size.

Click the image to open in full size.

Last edited by KHashmi316; 22nd May 2020 at 02:31 PM.
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Old 23rd May 2020, 06:40 AM   #3
kinsei is offline kinsei
diyAudio Member
 
Join Date: Nov 2013
you might want to read this:

AudioQuest JitterBug USB Filter Review | Audio Science Review (ASR) Forum
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