Audio grade USB cables


I've had issues with this for years, trying to wrap my head around digital bits being lost, etc. Anyway, the debate in my head is settled, the USB cable does in fact make a big difference to your sound. But not because the cable is special or not special, it's the computer. The 5 volt power feed from the computer's USB output port literally infects sensitive audio electronics - USB DAC's specifically.

Some expensive USB cable designs may in fact improve this problem but they don't solve the problem. The problem is the dirty 5 volt power feed.

So why not just eliminate the 5 volt power feed? I've heard of people simply cutting the power lead in the USB cable. That may work for some DAC's but the majority require 5 volt power to function. And USB DAC headphone amps are often powered by USB alone - no wall plug. So you can't just cut the line in most cases.

What you can do is replace the dirty 5 volt power lead with a clean source of power - and by clean I mean any wall outlet is going to be clean by comparison to your computer's USB output port. Why? Because your computer has literally millions of circuits that are making noise and that noise is transmitted down the 5 volt power lead!

And that dirty power may mess up the data bits too, by interfering with the data lines inside the USB cable. So it's a problem with many dimensions.

I created a new product called USB Disruptor to solve this problem. I've advertised on Audiogon and have a unit for sale on Audiogon. It's a simple idea, disrupt the computer's dirty power and replace with an independent source.

The units are hand made by me with 7 welds per unit. I use silver bearing solder and the best parts available - though you don't have to go overboard with digital because it really is just bits - so long as you've dealt with the dirty 5 volt power issue!

The improvement to the sound can be dramatic depending on your setup. With my headphone setup it's very easy to pick out the differences, and these have been replicated with several test subjects.

With my reference system I've already spent over $1200 on a USB isolation product that is supposed to clean up the power and more, but sure enough it's improved with USB Disruptor. For example, last night I was listening to The Doors debut album - has light my fire and break on through - and it's a high rez from HD Tracks - and this time, with USB Disruptor, it sounds like Jim is totally separate from the band. He's hovering 3 feet above the center of my speakers and I can hear him tapping his hand on his leg maybe, something I've never heard before.

Dirty 5 volt USB power clouds the music, but in a way that is evenly spread across the frequency spectrum, so it's hard to consciously isolate a specific problem, it seems to sound normal. It's like a shade is put over your music. You can still enjoy but you're not getting the clearest and most lucid picture. When you use USB Disruptor the shade is removed and you can hear the quiet spaces between musical notes.

You will only appreciate the difference when you hear it. Don't all of us audiophiles (sometimes audiophools) swear our system is just perfect and then we add something new and realize we were still missing something?

That happens to me a lot, and I was surprised USB Disruptor functioned as well as it did in my reference setup.

It's logical though: if your computer is connected to your audio system by means of a USB cable then interference laden 5 volt power from the computer is getting into your DAC and other audio electronics. It's going to be very, very hard to stop that dirty power from affecting your music.

The best way to solve this problem is to completely disrupt the power from the computer's USB port. And that's what USB Disruptor accomplishes - it's simple, effective, and affordable.

I have no doubt that USB DAC's of many flavors have been sold off or given away by many of our audiophile brothers because they just sounded crappy - too shrill at times, flat stereo image, etc. But it wasn't the DAC - it was the dirty USB power. This is hard to believe but it's true. And I know it's true because I've heard the results.

Have any of you guys tried cutting the 5 volt power lead in the USB cable? Did it work for your DAC? It won't work for most, but maybe some.

Anyone else try other products that have helped? I know USB Regen is similar, they claim to cut the power too but it's still actually connected, not exactly the same as USB Disruptor. Of course, USB Disruptor is less than half the cost of USB Regen.

And that Audioquest jitterbug, that is more like a filter. I don't want to filter anything for fear I'll lose precious signal. Anyone use those?

The fact is there's a problem with USB. These products all tell us that. But don't make any mistake, it's the dirty power from the 5 volt output that's the biggest issue, and that's the problem USB Disruptor solves.
robpriore
I am a software/systems engineer, but I use very basic USB cables mostly AmazonBasics which are not expensive and seemingly well made.

I have trouble getting my arms around what makes any digital cable worth a lot of money. Most any I try sound pretty good and leaving me uninspired to try anything different.

I have no such problem with analog ICs and power cords. I have heard clear differences in sound quality with these. I think I can with speaker cables as well though I have not tried very many different ones over the years.
Mapman, I tried a lot of USB cables while testing and they all sound equally bad running direct from the usb output port. When you disrupt the computer's 5 volt USB power line in many cases you get a really big improvement. And this improvement was not due to USB cables of one flavor or another, because when AB testing those units running the disruptor I couldn't tell one from another.

This finding is consistent with the logic of digital signal processing. There should not be a difference, not according to what we know, real and theoretical.

However, it is likely that some USB cable designs do in fact reject some of the USB power noise. But they can't get rid of it completely. And in that case one USB cable would in fact sound better than another, having removed some of the noise would improve the entire signal chain.

But it's still incomplete, and most people have not spent $1000+ on their USB cable to get that benefit, so in most cases it's very incomplete. And that means dirty power is leaking into the entire signal chain and polluting everything all the way to the speakers.

In that case it gets to be a very frustrating process of elimination to find the cause of the problem. In my case it took six years of experimentation to get to the truth.
I believe there are various versions and modes of usb operation some older and not well suited for hifi audio. I think getting a good asynchronous mode usb implementation on both ends is important and would not worry much about the cable until that is addressed.
Hi Robpriore,

I really appreciate audiophiles who contribute to tze hobby. Your USB disruptor certainly seems like a step in that direction.

I agree with you - 5V in USB cable is a problem. Definitely.
If one is able to completely cut it off (let's say, makes a DAC with USB input powered from the DAC itself) - and then makes a USB cable without +5V leg - would you USB disruptor make a difference in such case?

USB cable then would have + DATA, - DATA, and -5V (ground) legs - and that's it.

Would your product make any difference in such case?
On the Doukmall dual cable, is the signal leg identified separate from the power leg and lack the leads for power?