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Author Topic: Bluetooth headphones  (Read 576 times)

Weaver

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Bluetooth headphones
« on: June 06, 2019, 03:26:08 PM »

My Sennheiser headphones have a faint mains hum when I have the dc power cable into them. The obvious cure is to disconnect the cable, but then of course the battery goes flat because I forget to reinsert it when I am not using them. Any suggestions? What about some kind of filtering?

The power cable is a USB-to-some really strange looking flat connector.
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sevenlayermuddle

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Re: Bluetooth headphones
« Reply #1 on: June 06, 2019, 11:11:39 PM »

If it is a steady hum, ie it doesnít come and go with movement and orientation, and it hasnít always been there,  my guess would be a hardware failure.  Most probably imho, a faulty decoupling/smoothing capacitor.  Electrolytic capacitors tend to be a weak point in any modern apparatus, ďmodernĒ as in mid 20th century onwards.

Might be worth trying a different PSU.  Any chance the ďflat connectorĒ might be a USB-C?
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Weaver

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Re: Bluetooth headphones
« Reply #2 on: June 07, 2019, 01:26:55 AM »

I wouldnít know about usb-c havenít knowingly encountered one - itís really small on the bottom of one of the headphones. But from the pictures of usb-c this doesnít look right as my connector does not half 180 degree rotational symmetry, it has little bumps and microscopic recesses on one side, and it has two sharp pointy corners and two rounded corners rather than two rounded ends.

I have had the headphones themselves repaired a while ago.
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tubaman

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Re: Bluetooth headphones
« Reply #3 on: June 07, 2019, 09:17:41 AM »

The connector sounds like it is micro-usb from your description, which from a quick Google check is a type that Sennheiser use.
As suggested by @sevenlayermuddle my first thing thing would be to try a different PSU as they do vary in quality greatly.
Another option might be to try a USB power bank to charge/power the headphones. You would of course need to remember to charge that too, but it would run them for longer than just their own batteries. What I don't know is if you can use a power bank like a mini UPS - ie charging it and pulling power from it simultaneously (and whether that would make any difference to the hum anyway?). Others may be able to advise.
 :)
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BT FTTC 80/20 Huawei Cab - Zyxel VMG8924-B10A

Weaver

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Re: Bluetooth headphones
« Reply #4 on: June 07, 2019, 12:34:30 PM »

I got a power bank for my wife, to charge her iPhone. Thatís a good idea, as it banishes all mains from the whole system. Thank you very much!

I tried plugging it into different devices, first into a usb socket on a Belkin mains distribution block which also has a usb output. Then tried it into an Apple white usb mains power adapter thingy -donít know what itís called. Hum still persisted though.

The sound quality in these headphones is not that great given that they cost a small fortune. There is persistent low level white noise, which I would have hoped is a thing of the past. They have an environmental noise cancelling facility which is excellent.
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sevenlayermuddle

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Re: Bluetooth headphones
« Reply #5 on: June 07, 2019, 02:07:54 PM »

Clutching at straws maybe, but have you tried a different cable?

You might find you have one lying around, isnít micro USB common for phone chargers?   Except Apple of course.  But other stuff too, fairly sure my old Sat Nav, before I started just using a smartphone, had micro USB cable...
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Chunkers

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Re: Bluetooth headphones
« Reply #6 on: June 07, 2019, 07:12:15 PM »

What sort are they? I have an old pair of RS180 wireless Sennheisers and they don't suffer from any noticeable noise and sound excellent, so it definitely sounds like there is an issue

C
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Weaver

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Re: Bluetooth headphones
« Reply #7 on: June 08, 2019, 01:44:33 AM »

They are `momentum m2í something or other, cant remember.
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tubaman

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Re: Bluetooth headphones
« Reply #8 on: June 08, 2019, 09:25:49 AM »

They are `momentum m2í something or other, cant remember.

It looks like they are micro-usb then. It's a very common connector so leads are easy to get and cheap (certainly don't pay Sennheiser prices).
 :)
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Weaver

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Re: Bluetooth headphones
« Reply #9 on: June 08, 2019, 06:10:59 PM »

Have ordered micro usb cables from Amazon. Many thanks for all the help. You have all been brilliant. Amazon does a nice job of mixing USB-C and Micro USB cables up so that ordering is difficult.
« Last Edit: June 08, 2019, 06:21:09 PM by Weaver »
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