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Sound Reinforcement - Forums for Live Sound Professionals - Your Displayed Name Must Be Your Real Full Name To Post In The Live Sound Forums => Wireless and Communications => Topic started by: Chris Eddison on March 02, 2018, 04:03:07 am

Title: Attenuator for cheap headset mics with wireless beltpacks - anyone done it?
Post by: Chris Eddison on March 02, 2018, 04:03:07 am
Hi all
Iíve been searching for a while for some ok sounding cheap headset mics. Iíve used the Pulse/CPC ones for years but have recently had some reliability issues with them.
Iíve found the IMG Stageline (Monacor) HSW-130/SK to be good but as with a lot of cheap headsets itsí output is very hot and is clipping my (Trantec S5) beltpacks with loud singing or shouting even with the gain turned down.
The connector is a 4 pin mini xlr wired to the Shure pinout (10k resistor between 2 of the pins for DCbias). I reckon thereís space to build in a small attenuator circuit within the connector. Just wondered if anybody had managed this before? I reckon I need to lose 6-8dB to make things a little safer. Donít want to affect the DC bias though.
Title: Re: Attenuator for cheap headset mics with wireless beltpacks - anyone done it?
Post by: Keith Broughton on March 02, 2018, 08:01:08 am
I have not done what you are suggesting but I don't see why it would not work.
Having had a similar problem with cheapo headset mics, when buying a new bunch I did find ones with less sensitivity (lower output).
Title: Re: Attenuator for cheap headset mics with wireless beltpacks - anyone done it?
Post by: Scott Helmke on March 02, 2018, 10:06:06 am
I know you're not using Shure beltpacks, but maybe Trantec copied the exact spec. In which case, the middle pin (pin 4) has a 20k resistor to ground in the beltpack. That's used in some topologies to provide a path for the DC bias to ground, if the capsule itself doesn't do that.  So if that pin is connected to the audio input pin (pin 3) then maybe a similar resistor between the wire from the capsule and the audio input pin would give you a voltage divider.
Title: Re: Attenuator for cheap headset mics with wireless beltpacks - anyone done it?
Post by: Chris Eddison on March 05, 2018, 05:31:37 am
Thanks everyone.
I'll give building an attenuator a go and let you know how I fare.