Bose Tonematch T4S channel strip/Aux out noise

Portable PA
1

I had purchased a Bose T4S Tonematch mixer online in Dec 2019.

 

Worked seamlessly until 2 months back when it started giving a white noise in channels 1 & 3 whenever the Phantom power is switched on. Upon pressing the button, a huge disturbance/rush of electricity maybe comes in the channel and dies down within 5-6 seconds.

Also, the aux out channel is having the same issue.

 

The problem started occurring when I switched on the 48V while the gain and volume knobs for channels 1 & 3 were open which were connected to a condenser and a mandolin with a pickup. I heard a loud crackle and the white noise started occurring thereafter.

 

I don't know how to deal as I live in Mumbai, India and the product was purchased in New Jersey, US. I have tried connecting to their support team but got no response probably because of the COVID-19 lockdown.

2

Hey, welcome to the Bose Pro Portable Community!

Thanks for your post, I'm sorry to hear about the issue you're experiencing. To get a better idea on the setup you have, please could you confirm the following:

  • Does the "white noise" rush only ever occur in channels 1 & 3? 
  • Does this also happen if no cable is connected to the inputs for channels 1 & 3?
  • What FX processing settings are applied to channels 1 & 3?
  • What is the aux output being used for?

Also, if possible, could you please provide a short video clip showing the issue for reference?

Thanks!

 

3

Hi, 

To answer your question

1. Yes.

2. Yes. It always happens when I toggle the Phantom power button. On or off.

3. It happens regardless of the FX settings, I've tried with FX mute, all set to zero, unity. Nothing changes.

4. I am connecting my acoustic guitar through a Fishman rare earth mic electromagnetic pickup into channel 4. Then, I'm taking the aux out into my pedal chain (consisting of tuner, reverb, octave & a looper) whose output I take back through aux in. The looper after recording, plays back a loop with a heavy white noise. I'll update this forum with a video of the same soon.

4

Hi there,

  • Sorry for the extremely late reply. Here's a video showing what the noise level is when the phantom power is switched on
  • Please let me know how can I get this fixed. I live in Mumbai, India and this happened within the warranty period. 

https://youtu.be/KyXft0qzwF8 

5

Hi Shashank!

Thank you for providing this video for reference, sorry to see you're having this issue.

I recommend trying a factory reset if this has not yet been attempted (please note: this reset erases all settings & scenes and returns your product to its default out-of-box state):

  1. Power off your mixer
  2. Simultaneously press and hold the four Mute buttons on channels 1, 2, 3 and 4 and, while holding them, powering on your mixer
  3. When Factory Reset Please Wait appears on the display, release the Mute buttons
  4. Wait until Factory Reset Complete appears on the display before operating your mixer.

Hope this helps!

6

Hi  

I tried hard resetting the device. I think the problem lies in some faulty hardware which is causing the white noise issues.

 

I'm attaching a couple more videos for your reference. Please check them out too and help me out if there's anything else that can be done.

 

https://youtu.be/elEgnt1KmeE

 

https://youtu.be/DZrXueQvTYk

7

Hi Shashank,

Very strange. I recommend performing an update on the T4S if this has not been attempted already. 

If the issue persists once the firmware is up to date, I advise contacting the Bose support team directly to discuss available service options.

8

Hey ,

Have tried updating the thing too, didn't help. Did it again yesterday, still the same. Also, I tried reaching to the support team, I got no response last time. I'm gonna go ahead & mail them again. Hopefully, this time they'll reply. Thanks for trying to help!