ubxf

Old Behringer B2 Pro
« on: February 27, 2021, 08:47:48 PM »
I just got one of those B2 with a removable head and i read the mod threads but i couldn't for sure get a definite conclusion of the findings. If i understood it right the mods described are quite involved but didn't make a huge sonic difference. It looks like in some pictures that there is a styroflex cap that is not in the original. Is that a capsule coupling cap?
Could you please advise on the value and where is it connected. Are some parts removed. The big difference seems to be the capsule i will start there and swap the original for  a ck12.


kingkorg

Re: Old Behringer B2 Pro
« Reply #1 on: February 28, 2021, 09:45:48 AM »
No mods to the electronics made any difference for me. It's a great circuit with good components.

Under the capsule in the black plastic box there are two cheapest possible ceramic disk caps, they should be replaced for higher quality ones. I believe they are 1nf caps.

The capsule is the thing i like the most about that mic. It is found in some highly regarded mics(Soundelux, Rode classic, Townsend labs Sphere), but it is bright.

I would add some foam padding under the capsule to scatter some of the reflections around the capsule.

You can add microphone parts type of mod to get closer to u87 sound, and tame the high end by adding two 10k resistors and one 1nf cap.

 http://www.audioimprov.com/AudioImprov/Mics/Entries/2014/2/8_EQ_Pt.3_-_Transformerless_Mics.html

You dont need the pot, just leave it out.
« Last Edit: February 28, 2021, 10:17:37 AM by kingkorg »

ubxf

Re: Old Behringer B2 Pro
« Reply #2 on: February 28, 2021, 10:01:13 AM »
Thanks Kingkorg, will do. Is the capsule a CY002 from 797 the same as in the NT2S

kingkorg

Re: Old Behringer B2 Pro
« Reply #3 on: February 28, 2021, 10:11:22 AM »
Yes, should be the same.

Khron

Re: Old Behringer B2 Pro
« Reply #4 on: February 28, 2021, 11:27:07 AM »
Might be even simpler to add a capacitor (or a cap in series with a resistor) in parallel with the JFET drain resistor. Maybe... No need to cut any traces, at least :)

You can add microphone parts type of mod to get closer to u87 sound, and tame the high end by adding two 10k resistors and one 1nf cap.

 http://www.audioimprov.com/AudioImprov/Mics/Entries/2014/2/8_EQ_Pt.3_-_Transformerless_Mics.html

You dont need the pot, just leave it out.
Khron's Cave - Electronics - Audio - Teardowns - Mods - Repairs - Projects - Music - Rants - Shenanigans

ubxf

Re: Old Behringer B2 Pro
« Reply #5 on: February 28, 2021, 11:28:11 AM »
Thank you, do happen to know the polarization voltage of the capsule in this mic

kingkorg

Re: Old Behringer B2 Pro
« Reply #6 on: February 28, 2021, 11:35:42 AM »
I think it's 50v iirc.

ubxf

Re: Old Behringer B2 Pro
« Reply #7 on: February 28, 2021, 12:18:56 PM »
Great Thank you, so it's safe to put a CK12 in it

kingkorg

Re: Old Behringer B2 Pro
« Reply #8 on: February 28, 2021, 12:30:08 PM »
Yupp :)

ubxf

Re: Old Behringer B2 Pro
« Reply #9 on: February 28, 2021, 09:07:47 PM »
"Under the capsule in the black plastic box there are two cheapest possible ceramic disk caps, they should be replaced for higher quality ones. I believe they are 1nf caps."
So i located those 2 capacitors why would they use that ? if they used good components everywhere else.


kingkorg

Re: Old Behringer B2 Pro
« Reply #10 on: March 01, 2021, 12:42:49 AM »
That one has boggled my mind a lot, i really have no idea.

gyraf

Re: Old Behringer B2 Pro
« Reply #11 on: March 01, 2021, 02:55:28 AM »
..perhaps they were planning a future "high-grade" series at the time, and needed the gap..

 ;D
..note to self: don't let Harman run your company..


 

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