syn

RCA BE-100 Presence bandwith
« on: June 11, 2020, 01:32:52 PM »
Like this eq,  very much, extra big bottom, very dirty and grainy,  very  interesting presence  control, only if, the presence bandwidth could be wider - pretty narrow it is now. Is there a way to broaden presence bandwidth?

Thank you
« Last Edit: June 11, 2020, 01:42:17 PM by syn »


Re: RCA BE-100 Presence bandwith
« Reply #1 on: June 11, 2020, 03:55:50 PM »
Maybe, change the ratio of  C15/C16?

syn

Re: RCA BE-100 Presence bandwith
« Reply #2 on: June 11, 2020, 05:17:49 PM »
Thanks,  I'll give it a try tomorow. 

mjrippe

Re: RCA BE-100 Presence bandwith
« Reply #3 on: June 12, 2020, 12:54:01 AM »
I'm glad someone else is having fun with these.  I had one, I think Chris at Preservation Sound had one on his website a while ago.  They are not amazing eqs, but worth setting up and playing around with.  I'd be interested in any new findings.

syn

Re: RCA BE-100 Presence bandwith
« Reply #4 on: June 12, 2020, 02:57:51 AM »
Yes, the lows are among boomiest , really deep and low,  but with  punch and attack,  and presence  actually acts more like synth filter than mid band eq, full of character very dense sound. Hi band  I don't care for , nothing interesting there for me.

abbey road d enfer

Re: RCA BE-100 Presence bandwith
« Reply #5 on: June 12, 2020, 02:59:58 AM »
Like this eq,  very much, extra big bottom, very dirty and grainy,  very  interesting presence  control, only if, the presence bandwidth could be wider - pretty narrow it is now. Is there a way to broaden presence bandwidth?
Is it really that narrow? I see  a BW of 3.3 octaves. Has the unit been modded? Can you trace the actual frequency response?
Who's right or wrong is irrelevant. What matters is what's right or wrong.
Star ground is for electricians.

syn

Re: RCA BE-100 Presence bandwith
« Reply #6 on: June 12, 2020, 03:21:36 AM »
No, it has not been modded.  There is a certain "telephone line" quality  to the sound that I came to associate with  a narrow bandwidth setting to the mid range , but I might be wrong. Also all the pots are original but they seem to put all the action towards the max setting (fully right) like pot law is not ideal. Will try to trace later tody.

syn

Re: RCA BE-100 Presence bandwith New
« Reply #7 on: June 12, 2020, 08:10:34 AM »
Abbey,  thanks for looking into this

max boost around 1k RMAA  shows like this.
I played some more with the eq and I'm more and more convinced that this is actually  inadequate pot law problem,  almost nothing happens up to max  boost and it is suddenly maxed out, hence peaky quality.

All pots are original and LIN law
« Last Edit: June 12, 2020, 10:23:32 AM by syn »


 

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