External volume control box pot value?

[6V6dude]

I need to make external volume control. I'm connecting mixer line output to PA mixer Mic input. The input level is too high for the PA to handle so I need to control it because the PA preamp has volume control after the preamp circuit, not on the input socket. Hope I make sense . My guess is that 100K log pot should do it .
But the mixer output all ready has a volume pot but I don't know what value it is so I'm thinking using 100k after it shouldn't put too much extra load on it?

 

[stv]

the mixer output all ready has a volume pot

A pot just before output connectors? That seems strange to me ...

I would assume there is an opamp as final stage, connected directly to the output.
Also 100 k seems too high.
Do you know input impedance of your amp?

Edit - have a look:
https://www.diyaudio.com/community/threads/matching-pot-impedance-to-amp-input.406731/post-7539747

 

[6V6dude]

Yes the mixer has opamps on outs. So I just want to put volume pot behind it before it goes to the PA amp inputs. It's an old 60's amp, all transistor with 33k on inputs. Thinking about it, as you mentioned 100k pot is too high, it makes sense since it's designed for mics. Maybe 10k? Thanks.

 

[rayma]

Definitely 10k.

 

[WhiteDragon]

Yes generic passive mixer usually 10k.
Which is essentially what your making.

High gain mic input can be 10k to 50k
10k pot pretty generic for newer mix

Since signal is coming from plain old mixer
line output.

10k for passive volume control be fine.
Little impedance never hurt, technically higher
be fine 20k , 50k
As mentioned 100k is maybe to high.
But high impedance isnt the issue.
100k is more than friendly to line signals.
Its more a issue of the volume attenuation
being too jumpy. so anything over 50k
be little to quick.
10k 20k 25k all fine
Unless my mind is working backwards.
The right choice of course, is whatever is laying in your parts bin.
sure that one..lol