20 Most Recent Sennheiser Hdr120 Hdr-120 Wireless Headphone Questions & Answers

Try googling (Sennheiser)(HDR 40)(manual) without parens.

Sennheiser Radio... | Answered on Mar 18, 2018

You have to wire the plug to eliminate the voltage sent by the sound card. I can't remember if it's the tip or the sleeve, so you'll have to verify with a volt meter. Use a 3 position plug to solder to the mic wires, just don't connect the wires of the mic to the one that has voltage on it

Sennheiser Radio... | Answered on Jul 28, 2017

Yes I had the same problem. Under some circumstances the MM100 freezes (didn't figure out when just yet). It's a software issue inside. Solution: open left speaker (the side with the charge connector and hence the battery). Discharge the battery (or just short circuit for half a second) and it works again. Sennheiser should built a reset button on these things.

Sennheiser Radio... | Answered on Jul 13, 2017

Send it back it is faulty. The battery is shot.


go and buy (2) AAA NiMH rechargeable batteries from here which will be far better quality and have a larger capacity than the ones you have.

AAA Eneloop Precharged NiMH Battery 2 Pack Batterybuyer com

Sennheiser Radio... | Answered on Jun 09, 2017

Just put your problem on social media, including the brabds abd they will answer, i know these kind of cimpanies. Moest just ignore you but hate bad publicity. ain't you have got a forum for consumerproblems?

Sennheiser Radio... | Answered on Aug 22, 2014

have you checked the Tensioner Pulley? Also may be Water pump
Try soap or Belt Dressing on belts n see if it stops squealing,if not most likely Tension Pulley

Sennheiser Radio... | Answered on Mar 05, 2014

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