speaker humming

4 replies
PA
Offline
paddy2042
GoldFounder
Posted June 25, 2023 at 07:25 GMT
#1642418
I have an iTunes library that is connected to my BS9000 via AirPort Extreme and Express and A. Mem. input. When I play CD's on my Bs9000 the sound is fine but when I play iTunes music there is a loud hum. The hum begins as soon as I change inputs from CD to A. Mem. so don't think it has anything to do with Mac.

I guess because of the good quality of sound from CD there is nothing wrong with the BS9000 or the speakers or cables to them. The A. Mem input used to be fine but the hum has appeared in the last few months.

I have turned off as many other electrical devices in the room as I can I have a DAC connected which I have also disconnected. I have also tried to plug speakers, BS9000, DAC and Airports into the same powerpoint but alas no success.

I am hoping that someone has some bright idea that may solve my problem as I have a large iTunes library that I cannot play through system because of the hum.

Patrick
trackbeo
Offline
trackbeo
Bronze
Posted June 25, 2023 at 08:21 GMT
Edited June 25, 2023 at 08:26 GMT
#1657285
3.5mm plug half-pulled-out / not fully inserted into jack on AirPort Express?

Despite the fact that cables don't die and active devices do, cable failure of some kind is nevertheless more likely than the Beosound 9000 Aux input going bad.  But that's easy to test, by unplugging the BS9000 DIN end of the adapter cable, and if there's still a hum on Aux.In, it's likely the BS9000 itself.

If the AirPort Express is gen.1 (hard plug to wall), possibly it's dying -- that power supply doesn't last forever.  But usually other stuff happens instead/also, like its Wi-Fi range gets much smaller.  If the AirPort Express is gen.2 (separate line cord), it's too soon to be dying, which is why I suspect the cable (or its connectors).  If it is the culprit, maybe replace it with a brand-new Wiim Mini rather than trying to source an old, used AirPort Express on eBay.

 
PA
Offline
paddy2042
GoldFounder
Posted August 16, 2026 at 02:00 GMT
#1673957
The interesting thing is that I have a link room with my Mac in it and BL 4000's connected to a BL Active and there is no hum in this room.

It is only in the main room where the hum is as there is another AirPort Express there connected 3.5mm to 2x RCA to the Aux on the Beosound 9000. This is what feeds the sound to the main system. Hum in Main room but not in the other. I cannot work this out.

I have replaced the cable to no avail.

Before I replaced the cable I did notice that if I pressed the connection (I needed to join the cable to get the length)  the hum would stop. When I let it go it would continue. With the replacement cable the join does not respond to being pressed and the hum continues either way.

Not sure what to do now. Any help would be appreciated

paddy2042
PA
Offline
paddy2042
GoldFounder
Posted August 21, 2026 at 09:15 GMT
#1674003
I don't understand how the hum can be through the main room speakers but is not transferred to the link room even though both rooms use the BS9000's Aux. Input which is connected to the AirPort Express.

Very strange indeed.

paddy2042
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