I have recently managed to get my JL amp and JL subwoofer working after many setbacks. Apart from a few tweaks, I am very happy with the setup. When I music direct from my phone (iPhone) via blue tooth, I get a ‘schsing’ noise in the background. If I turn down the music volume to zero, this noise is still there. However if I play a CD from the Headunit, I don’t get this noise.

 

I had read on line that a poor earth my cause this issue, but the amp and HU both have a good earth connection, but the sound disappears when I play a CD. :no:

 

Any pointers greatly appreciated.

Have you tried a different phone . And what volume are you set at on the phone ? If max try turning it down a bit, may be from the iphone internal amp

Thanks Ian, a different phone may be a problem ,as the whole family use's iphones. I will try the volume setting this evening.

My wife had this problem when in her car so I asked her to turn the fan off and the noise stopped. Maybe worth a try.

My wife had this problem when in her car so I asked her to turn the fan off and the noise stopped. Maybe worth a try.

 

PMSL :lol:

Have you tried pairing your iPhone with another bluetooth enabled speaker or headphone device to see if the ‘schsing’ is still present?

Have you tried installing your iPhone in the bin and getting a more superior Android phone? :lol: ;)

Ok, so after further investigation, even with the volume of the phone, set no higher than 50%, the background noise is still there. I did wonder if the it was due to the musics compression format (Apple Lossless). But having listened to a digital Radio station via Bluetooth, it still suffers the same background noise.

 

I have another head unit that I am going to try out to see if noise is still present, as I cannot really see how it could be a wiring issue at this point.

What's the make/model of the headunit?

Does it only make the noise on Bluetooth connection, or does it do it if you connect via USB aswell?

What's the make/model of the headunit?

 

Sony BT2600 Andrew.

Does it only make the noise on Bluetooth connection, or does it do it if you connect via USB aswell?

 

 

CDs are fine, no radio as I have no Ariel.

 

Haha, it is a fairly old unit and doesn't have a USB out :thumbdown:

I'm looking at the user manual. Have you followed the setup and pairing procedure as described and noted the

limitation regarding BT phone use (hands free) and BT audio (page 13)?

 

Many thanks for the input Andrew.

 

I found some useful information, on the install instructions, and after setting the BTA ouptut to -8dB, the 'shissing' has now gone. :cool3:

 

Edited August 16, 20196 yr by bigh

Aha! Another case of RTFM :)