How to deal with EHX power supplies in pedalboards?
Post Reply
Newbie
Rank
Total Posts:  5
Joined  2017-12-07
Posted: 07 December 2017 12:23 AM

Unlike other of my pedals, my EHXs all create signal noise when plugged into my pedal power or other multi-adapter units, which I’m guessing is because EHX troublesomely uses 9.6 instead of standard 9v adapters.

Has anyone found a solution for this? I want to use several EHX pedals alongside my other pedals, but I don’t want to have to plug in separate 9.6v adapters for each EHX.

Quote
Member
RankRankRank
Total Posts:  98
Joined  2017-09-15
Posted: 07 December 2017 03:31 AM | Link to this reply (#1)

I haven’t found EHX effects to be particularly noisy compared to other effects. And I don’t think the voltage of the EHX adaptors has anything to do with it. The adapter might be 9.6 volts, but the effect will draw whatever it needs. Batteries vary in voltage over their life. Effects are designed to operate within a range of voltages. The reason you don’t get noise when you use their dedicated adaptors is because they are isolated. They are also isolated when you use batteries In fact, batteries is THE BEST way to isolate your effects, but it is a hassle. The better the isolation in your multi-effect power unit, the less noisy all of the effects will be. I have noticed that effects from the same manufacturer tend to play well with each other. Let’s say you have just DOD and EHX and nothing else. You MIGHT get better results having all of your DOD on one power supply and all of your EHX on another power supply.

You should test adding your effects one at a time to the power supply chain and see when you start getting noise. In my case, I noticed it was when I added a particular non-EHX effect to my mostly EHX effects chain.

Which power supply are you using? Which effects? What is the order? Have you tested with batteries vs. power supply to try to find the culprit?

Quote
Newbie
Rank
Total Posts:  5
Joined  2017-12-07
Posted: 07 December 2017 03:38 AM | Link to this reply (#2)

It’s the EHX pedals. I have a dozen pedals of all types, 9 and 12vs, and I can plug them all in using my pedal power-style adapters, and there is no signal noise (of course you get extra sound from the pedals in some cases, but this is just increased in white noise, or swirling if you have a flanger or phaser turned on or something. Totally different thing, and you can turn it off by turning the pedal off. Then when you plug in any of my EHX pedals, you get a whirling electronic pattern (kind of a highpitched current-y sound), which you can’t remove.

I don’t think I’m the only one dealing with this, as the guy at my local music shop seemed familiar with the EHX pedal noise problem as well. And it’s clearly demonstrable with any of my multi-power bars.

I suspect it’s because EHX uses the 9.6, but it could be some other issue with them as well.

Hopefully someone will have figured something out.

Quote
Administrator
RankRankRankRank
Total Posts:  1022
Joined  2011-02-22
Posted: 07 December 2017 11:52 AM | Link to this reply (#3)

Your noise is created because you are using a power supply that does not have isolated outputs.
CPU noise and hash then enters the signal chain. Cheap multi supplies are famous for non isolated outputs.
If you need to use such a supply the fix is an isolator adapter

With multi supplies you have to be careful as often the outputs are not isolated. That can cause noise between digital pedals. If that happens you need to use the original supply on the pedal with noise OR get a isolator plug like the one made by Diago PS-09
We are working hard to now build our pedals to work with these cheap supplies. here is the Diago plug
https://reverb.com/item/1678744-diago-ps-09-isolator-adaptor-clean-up-your-sound-free-shipping

ex

https://www.youtube.com/watch?v=NweK7wVh_LQ

https://www.youtube.com/watch?v=23nEsQ2CeuU

Quote
Newbie
Rank
Total Posts:  5
Joined  2017-12-07
Posted: 13 December 2017 09:48 PM | Link to this reply (#4)
EHX STAFF - 07 December 2017 11:52 AM

Your noise is created because you are using a power supply that does not have isolated outputs.
CPU noise and hash then enters the signal chain. Cheap multi supplies are famous for non isolated outputs.
If you need to use such a supply the fix is an isolator adapter

With multi supplies you have to be careful as often the outputs are not isolated. That can cause noise between digital pedals. If that happens you need to use the original supply on the pedal with noise OR get a isolator plug like the one made by Diago PS-09
We are working hard to now build our pedals to work with these cheap supplies. here is the Diago plug
https://reverb.com/item/1678744-diago-ps-09-isolator-adaptor-clean-up-your-sound-free-shipping

ex

https://www.youtube.com/watch?v=NweK7wVh_LQ

https://www.youtube.com/watch?v=23nEsQ2CeuU

Thanks for the response.

Not necessarily. I started out with a non-isolated Pedal Power (the kind with the string of branching-off 9v adapters. I got the noise there.

I then got a couple of more expensive isolated ones (the kind with the metal box, and isolated plugs on the box for 9v’s, 12v, 18v. I still get the noise from EHX pedals (and none of my other pedals). What fixes the problem: using an EHX 9.6v adapter separately. As I said, I don’t like doing this because it’s a lot to plug in several 9.6 adapters which take up a lot of plug in space, too.

I don’t know about the repeated reference to “cheap products EHX is trying to now work with.” There doesn’t seem to be anything cheap-quality about any of the power sources I’ve used. And none of my other pedals (BOSS, TC Electronic, Walrus, DOD, Dunlop, Digitech) cause this problem.

Could it perhaps be to do with the miliamperage, not the 9.6v thing? I don’t know enough about electronics to know.

Thanks for the link to the Diago plug. I’ll check it out, although of course using some special piece of equipment to use a pedal might not be considered ideal by many. - edit. Wow, 33 bucks each? So 120 bucks plus taxes and shipping to use my 4 EHXs.

Quote
Member
RankRankRank
Total Posts:  98
Joined  2017-09-15
Posted: 14 December 2017 03:37 AM | Link to this reply (#5)

Please list the specific pedals you’re using - brand and pedal.

Quote
Newbie
Rank
Total Posts:  5
Joined  2017-12-07
Posted: 17 December 2017 01:45 AM | Link to this reply (#6)

Here’s an audio clip of a new Key9:

https://vocaroo.com/i/s1Wcnkw1KLy7

It’s in a chain of a dozen pedals (but its the only EHX), which use 2 higher quality medal isolated power supply things. First you can hear it quiet while using the EHX brand adapter. Then you hear me unplug that and plug it into an isolated power just like the other pedals. You hear the EHX-signal noise I get with all EHX pedals.

The other EHX pedals I have: an old 24v Micro Synth (same sound as the new Key9), newish V256, and an 8-step. I also have a Silencer on the way.

I post all this info more for other people out there / consumers, who should know what they’re getting into if they have large pedal boards which they power from multi-power adapters, not for EHX staff who, considering the talent EHX has there at this decades old company, must be very familiar with this issue. And because I’d like it if someone could explain to me where the issue stems from, so I can think about fixing it / give up on fixing it.

Edited: 17 December 2017 03:14 AM by anlwpi
Quote
Newbie
Rank
Total Posts:  5
Joined  2017-12-07
Posted: 17 December 2017 03:13 AM | Link to this reply (#7)

Side note: how does EHX staff set up their guitar pedal demos at music shows (where they have a bunch of new pedals for people to try out)? What power system do you guys use for this?

Quote
Member
RankRankRank
Total Posts:  98
Joined  2017-09-15
Posted: 18 December 2017 12:00 AM | Link to this reply (#8)

I have almost exclusively EHX pedals. Here’s my most common chain:

Guitar -> MXR Noise Gate / Line Driver -> EHX Tone Corset -> Cry Baby Fuzz Wah -> EHX Nano Big Muff -> EHX Germanium 4 Big Muff -> EHX Small Stone Nano -> EHX Memory Toy -> EHX Canyon Delay -> EHX Holy Grail Nano -> EHX Nano Looper 360 -> Hawk Ltd. Tonal Expander II -> Fender Excelsior Amp

I power them all from a single LiveWire power supply. LiveWire is Guitar Center’s house brand. In other words it’s the cheapest, and the outputs are not isolated. I have very little noise in the line. Most comes from the guitar pickups which is why I put the noise gate at the very beginning. It MIGHT have to do with the fact that I have only two, sometimes three, digital pedals in my chain.

Quote
 
Post Reply
 
RSS 2.0 Atom Feed