The No.1 Website for Pro Audio
 Search This Thread  Search This Forum  Search Reviews  Search Gear Database  Search Gear for sale  Search Gearslutz Go Advanced
RCA 44-BX Low Cut Problem
Old 13th June 2015
  #1
Here for the gear
 

RCA 44-BX Low Cut Problem

Hello, I need your help. I've bought an RCA 44-BX microphone and it sounds great but it hasn't got that big, fat, warm sound. It seems there is a low cut activated. Attached you find a photo of the terminal board. Can you tell me how I need to rewire it to avoid that low cut? Thank you.

Old 13th June 2015
  #2
Gear Maniac
 
ShinyBox's Avatar
 

there should be no strap between the two center terminals. Like this (terminals are arranged differently, but removal of the strap is the same):

http://www.coutant.org/rca44bx/rcamic3.jpg


Regards

Jon
Old 13th June 2015
  #3
Here for the gear
 

Quote:
Originally Posted by ShinyBox View Post
there should be no strap between the two center terminals. Like this (terminals are arranged differently, but removal of the strap is the same):

http://www.coutant.org/rca44bx/rcamic3.jpg


Regards

Jon
Hello Jon, thanks for your reply. I removed the strap between the center terminals - now there's no sound at all...

Do you have another idea what I could try?
Old 13th June 2015
  #4
Gear Maniac
 
ShinyBox's Avatar
 

Hmmm.

The terminal arrangement is different than my 44BX, and also the ones from the coutant site..

Check out the photos from the coutant site to see if you can sort out how the wiring is arranged. Aside from that, it's something I could sort out if it was here, but you might want to have a tech take a look otherwise (or perhaps another person may happen a long who can weigh in).

RCA Type 44-BX

From what I see in the picture, it looks like the left hand terminal, black wire should be connecting to pin 2 of the xlr, the white wire, to the right, should be pin 3, and the green wire far right should be pin 1 of the xlr, respectively.

The other question is what the state of the ribbon looks like. An excessive stretch or sag to the ribbon can cause low frequency loss.

Regards

Jon
Old 13th June 2015
  #5
Lives for gear
 

oh, it seems your terminal board was reworked in the past. PB31 and 144 had this type of terminal arragement. you disconnect the black wires.

the jumper needs to be in place for the output transformer.

here is a schematic:
Attached Thumbnails
RCA 44-BX Low Cut Problem-pb31-pb1444wiring.gif  

Last edited by drtechno; 13th June 2015 at 07:18 PM.. Reason: clerification
Old 13th June 2015
  #6
Here for the gear
 

Quote:
Originally Posted by drtechno View Post
oh, it seems your terminal board was reworked in the past. PB31 and 144 had this type of terminal arragement. you disconnect the black wires.

the jumper needs to be in place for the output transformer.

here is a schematic:
Thanks alot for your post. I just had the same idea. Attached you find the terminal arrangement of my 44BX. So I can cut the black cables, right?

Old 13th June 2015
  #7
Lives for gear
 

Quote:
Originally Posted by 1942Banner View Post
Thanks alot for your post. I just had the same idea. Attached you find the terminal arrangement of my 44BX. So I can cut the black cables, right?

I would remove one of them. its probably the black wire I see tacked onto the terminal screw side. but I would take a solder Iron and pliers to remove it and tape off the wire or put it on a switch
Old 13th June 2015
  #8
Here for the gear
 

Quote:
Originally Posted by drtechno View Post
I would remove one of them. its probably the black wire I see tacked onto the terminal screw side. but I would take a solder Iron and pliers to remove it and tape off the wire or put it on a switch
You were absolutely right. I cut the black cable on the terminal front side (I don't have a solder iron) and now it works. It sounds fantastic. Thank you so much.
Post Reply

Welcome to the Gearslutz Pro Audio Community!

Registration benefits include:
  • The ability to reply to and create new discussions
  • Access to members-only giveaways & competitions
  • Interact with VIP industry experts in our guest Q&As
  • Access to members-only sub forum discussions
  • Access to members-only Chat Room
  • Get INSTANT ACCESS to the world's best private pro audio Classifieds for only USD $20/year
  • Promote your eBay auctions and Reverb.com listings for free
  • Remove this message!
You need an account to post a reply. Create a username and password below and an account will be created and your post entered.


 
 
Slide to join now Processing…
Thread Tools
Search this Thread
Search this Thread:

Advanced Search
Forum Jump
Forum Jump