H90 loud hiss and hum

Please contact support@eventide.com for the best troubleshooting. If they determine there is in fact a problem, they will be able to take care of you directly.

Hi pb4567string,

This very odd. When you emailed support, did you get an email verifying that the message was received?

I have this problem too. For example, the ground hum is loud enough that all pitch programs play an audible chord in the background; they are harmonising the hum – not hugely loud but enough to make the unit unusable. I tried an alternative PSU and it is the same. I have used Eventide products for 20 years and know this can’t be right. I should just return this unit, right?

Did you resolve it pb4567string?

I have the same problem. The hum <span style=”font-size: inherit;”>is louder with the H90 power supply. Using using one of the Eventide power units. The hiss is different from program to program. I imported some programs I wrote from my H9 and the H90 added more noise. </span>

This is why it is imperative to unlock the Bluetooth feature!

The noise is louder with the usb. I find it manageable when using my laptop instead of my desktop. Also choosing the correct input/output settings helps

This is what I hear.

00:00:00   Amp no fx with loop:      -28.1 dbfs

00:13:50   H90 no usb                  -17.8 dbfs

00:27:00   H90 usb                        -4.5  dbfs

00:40:00  H90 usb short cables -5.8 dbfs

00:53:50 Tc flashback no usb         -23.3 dbfs

01:07:00 Tc flashback usb              -22.9 dbfs

https://1drv.ms/f/s!Aj7QIcC9IL33hK4TWXku2qw29jvG1A?e=Vu44ZQ

Tried everything, other cables, everything in the same socket, after a powerconditioner, without powerconditioner. Changed IO, bypass, killdry settings in H90.

Guitar->H90 input1

H 90 output1->Duotone  H&K input

DuotoneH&K send->H90 input3

H90 output3->DuotoneH&K return

It’s a parallel loop and the amptone is kind off classic rock(no shitload of gain)

How can I fix this? Or is this a faulty unit??

Ok, just tried the H90 only in the loop of the amp, and the noise and hiss are almost gone. Input 3- output3.

But I need dual mode for whammy-wah-octaver and other pre stuff.

Seems to me that there is a problem with the unit when it’s in dual mode and in the parallel loop of a distorted tube amp…..

Or am I doing something wrong?

Bert Sleeckx wrote:

the amps loop has a dry/wet balance but 100% is still parallel! It’s not possible to make it serial.

It’s possible that effects loop functions differently than other amps with balance control. ENGL amps, for example, have a balance control and 100% generates a serial FX loop according to the manual.

Bert Sleeckx wrote:

There is a 50Hz noise when the H90 (in dual mode) is connected like this: Guitar->H90 input1 H 90 output1->Duotone H&K input DuotoneH&K send->H90 input3 H90 output3->DuotoneH&K return In the amps clean mode it’s not a problem.

This specific frequency is indicative of a ground loop in the system. You can try placing an isolation transformer in between the amp’s FX send and the H90 and the H90 Out to the effects loop return. It’s possible only one of these will solve the issue.

Should this do the trick?

Yes, that is a great option especially because it can be used for two channels.

Bert Sleeckx wrote:

Does this make sense to you, and is it safe?

Yes, it perfectly fine. Ground loops are a challenge to track down. Glad you solved the issue.

I’ve noticed a slightly different noise issue. It only occurs when I connect the H90 to my MacBook Pro via USB to use the H90 Control App. As soon as I connect the cable, I get a noticeable amount of “computer noise” coming through my Scarlett 4i4 audio interface (same issue with my Scarlett 2i2). This is not 60Hz ground hum. It sounds like it’s a function of what the H90 processors are doing… kind of like if you float your cellphone over your guitar pickups. As I navigate through through the H90 Control App, that pattern of noise varies slightly. I’ve tried a couple of different US cables… same issue. Any ideas? Is there a USB “isolation” device?

Tried a USB-C cable with ferrite chokes on both ends… no change in the noise level.

But…

Just saw that Eventide is going to be supporting Bluetooth connectivity, so… problem solved!

Thank you, Eventide!

On Monday, November 27th, Eventide will be making a public beta of firmware providing Bluetooth functionality to the H90. By installing Application Firmware version 1.7.1 (Beta) via H90 Control, users will be able to pair to their pedals to MacOS computers as well as Apple iPads to control the H90 wirelessly using the app.

Mine just started to do this with the USB cable plugged in too. Even in bypass mode it’s just a noise generator & not usable. I need to have the USB for clock sync.

It doesn’t really make sense why considering that no audio is passing thru the USB cable & the unit is being powered by a power supply.

With a highest quality USB-C cable direct into a macbook this unit should be DEAD quiet. Never have I ever had any USB problem ever like this even with really inexpensive gear.

Are we sure there just isn’t a problem with the USB ports on these units?

The output as well as the hum both got louder with the current update.

Hi, I just recently purchased an H90 and I find there is hum and phasing noise when I use the flange or and rotary algorithm  or delays. Ive tried it in the FX loop. Straight in the amp, with and without distortion, (both before and after the H90) . I have an H9 ive been using for quite some time and its dead quiet even with distortion. I updated the software, reset the factory presets. Im at a loss here. Any input would help.

Thanks

Anthony

My issue ending up coming from a non-powered USB hub that wasn’t even in the chain.

But ideally you want all your gear to have the same ground or you’ll get this problem.

I still feel there is a design issue as no audio passes thru the USB – seems like some kind of isolator is missing.

moreigloos I have everything coming from a great power sully on my board. Still noise. Scratching my head at this point.

Oh boy, the hum is out of control on my H90, making it unusable. I’m simply running In 1 and Out 1 to the FX Send and Return of my Mezzabarba Skill 30 combo.  Other delay units I’ve plugged into the FX Loop (Boss Space Echo, Earthquaker Avalanche Run) are quiet as a mouse. It’s just the H90, which is causing all kinds of problems. I’ve not used the unit at all since purchasing it brand new, and was saving it for recording and it’s now probably out of warranty. I do suspect that it’s some sort of setting in the unit, as pressing the ‘Parameters’ button gets rid of it.  I’m not much of a gear tweaker and was counting on the H90 Control to save some patches both for live use and recording. I’m posting this as a last resort to see if I can salvage anything from this unit.  I just did the latest firmware update too.  Any help would be greatly appreciated as I was really looking forward to getting creative. Thank you.

Thanks so much for the speedy reply… okay, so I think I’ve got things resolved. I reconfigured my setup for the four cable method in Dual Mode (rather than running exclusively in the loop). This has resolved the hum/noise issue (still don’t know why it was there in the first place, but I’ll take it!)… I need to work the levels of the unit (while getting used to it), but will do it tomorrow, as I don’t need the cops at my door!   Thanks again for the prompt reply and I’ll report back tomorrow… so far so good! (What a great sounding unit!)….