Beolab 7.1 static noise

22 replies
P(
pouls79 (archived2)
Bronze
7 posts
Posted September 9, 2020 at 10:27 GMT
#2143332

Hi, 

I recently purchased Beolab 7.1 speaker to use it with my Onkyo tx Nr 807 av receiver as a centre speaker, I managed to solder a trigger cable. It goes from preamp out from the receiver to 7.1, I can hear the sound ok but there’s that annoying static noise. When connected to iPhone with the same trigger cable the static noise is not present. I also connected Beolab 7.4 but same issue. Do you think the trigger cable might has something to do with it? Or should I get the proper cable from sound heavenly? Or is there something wrong with my av receiver? Does anyone of you experienced same problem?

thanks

Ravsted
Ravsted
Bronze
458 posts
Posted September 9, 2020 at 14:29 GMT
#2143333

Hi

Sounds like 'ground noise' issue.

How did make the cable ?

Does the Onkyo have a trigger ? What is the voltage (12v) ? And how did you lower the voltage to 3-5 volts ?

You could try to trigger the BL7 from a separate USB charger and verify if the static/ground noise disappears.

Ravsted
Ravsted
Bronze
458 posts
Posted September 9, 2020 at 15:42 GMT
#2143334

I use this cable with my BL7-2

Turns on/off automatically with my none B&O TV

https://www.av-connection.dk/?PGr=6497

They got a version for 12v trigger as well

 

P(
pouls79 (archived2)
Bronze
7 posts
Posted September 9, 2020 at 19:49 GMT
#2143335

The 5v comes from my USB port on my Samsung tv but I’ve tried several power sources iPhone charger, USB port on my extension lead but still same. 

Ravsted
Ravsted
Bronze
458 posts
Posted September 9, 2020 at 20:12 GMT
#2143336

How do you wire audio?

RCA > PowerLink

 

Is both PIN2 and PIN7 connected to ground ?

https://www.beoworld.org/beotech/wiring2.htm

 

In the Powerlink MK3 cable, the Pin 7 must be connected to the ground.

MK3 cables are used with BL's with IcePower amps. BL7 has IcePower.


Pin 1 - Not used

Pin 2 - Audio Ground - Screen

Pin 3 - Left Audio - Brown wire

Pin 4 - ON/OFF - Yellow wire

Pin 5 - Right Audio - Green wire

Pin 6 - Not used

Pin 7 - Data ground - Blue wire

Pin 8 - Not used

P(
pouls79 (archived2)
Bronze
7 posts
Posted September 9, 2020 at 20:31 GMT
#2143337

Pin 2 audio and 5v ground wire, 3,5 left right, 4 5v+ I haven’t touched pin 7

Ravsted
Ravsted
Bronze
458 posts
Posted September 9, 2020 at 21:04 GMT
#2143338

That's the reason

Use pin 2, 3 and 5 for audio

Use pin 4 and 7 for trigger

That will separate ground

 

Ravsted
Ravsted
Bronze
458 posts
Posted September 9, 2020 at 21:16 GMT
#2143339

As always, Peter Pan has made a drawing for this scenario.

https://forum.recordere.dk/bo-din-kabler-connection-div-diy_topic7820_page52.html

You should be able to find his many drawings on Beoworld.org  as well

P(
pouls79 (archived2)
Bronze
7 posts
Posted September 9, 2020 at 23:59 GMT
#2143340

Brilliant, I’ll try that tomorrow

P(
pouls79 (archived2)
Bronze
7 posts
Posted September 10, 2020 at 11:03 GMT
#2143341

So I soldered as per instructions but still same problem 😕😤

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