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Loud pop and LED flash powering on/off OB-6

Loud pop and LED flash powering on/off OB-6
« on: April 22, 2021, 02:28:58 PM »
Hey guys! When I turn off or on the OB-6 I get a large pop sound and the LED flashes on/off then back on and it's good.
I just got the OB-6 and I've never seen this on my Prophet 12, so I was just wondering if its normal. Seems like it just takes a big surge of energy which may be normal. But I now make sure I'm not wearing headphones when I turn off/on because it's a pretty harsh click.

Thank you :)

Re: Loud pop and LED flash powering on/off OB-6
« Reply #1 on: April 27, 2021, 03:41:41 AM »
Hey guys! When I turn off or on the OB-6 I get a large pop sound and the LED flashes on/off then back on and it's good.
I just got the OB-6 and I've never seen this on my Prophet 12, so I was just wondering if its normal. Seems like it just takes a big surge of energy which may be normal. But I now make sure I'm not wearing headphones when I turn off/on because it's a pretty harsh click.

Thank you :)

Yes, I have the same thing here.

Re: Loud pop and LED flash powering on/off OB-6
« Reply #2 on: April 27, 2021, 08:35:35 AM »
Same thing here too !

MPM

Re: Loud pop and LED flash powering on/off OB-6
« Reply #3 on: May 02, 2021, 01:40:37 AM »
Rule #1
Turn volume all the way down before powering on.
Rule #2
Turn volume all the way down before powering off.
OB-6  Prophet-6  Prophet.Rev2/16  no kids

Re: Loud pop and LED flash powering on/off OB-6
« Reply #4 on: June 13, 2021, 08:53:50 AM »
Rule #1
Turn volume all the way down before powering on.
Rule #2
Turn volume all the way down before powering off.

 ;D

Yeah it's normal.
Happens with my OB-6 but not with the Pro 6.
*shrug*

Re: Loud pop and LED flash powering on/off OB-6
« Reply #5 on: June 13, 2021, 10:37:39 AM »
Perfectly normal, if somewhat irritating.

That is due to the fact that Sequential (formerly DSI) didn't want to spend an extra $2 per unit to add a temporised output muting circuit consisting of 2 FET transistors (or one small electromechanical relay) to temporarily and automatically mute the output of this $3000+ instrument when powering it on, or off. Even my 36 years old Korg DW8000 has such a small circuit inside.  ::)
Minimoog D (vintage), OB6 (Desktop), Oberheim Matrix-6 (MIDI Controller), Prophet REV2-16, DeepMind 12, VC340

Re: Loud pop and LED flash powering on/off OB-6
« Reply #6 on: July 06, 2021, 02:47:27 AM »
It also does it with headphones even with the volume all the way down. Happened just the other day. I moved the OB6 to a new spot and didn't want to run the audio cables just yet, so I used the headphones. My ears are still ringing a bit.

A lot of audio equipment does this, including my Babyface Pro interface. I have all four powered Yamaha speakers & sub on a power strip so I can turn them all on/off with one switch, but sometimes I forget and get that loud pop just unplugging the USB from the Babyface (which is what powers it). These are also my PC speakers, and the PC will make them pop on shutdown if I forget to hit the switch.