I have a Transmitter 1 plugged in by RCA to the variable output of an Audiolab M-Dac + and paired wirelessly with Beolab 18s. The sound from the Beolab 18s has a loud hiss and I can hear distorted music with the hiss. If I turn up the volume on the preamp of the Audiolab very high and unplug the Transmitter 1 then the Beolab 18s work perfectly with no hiss and then I have to turn the volume down to a comfortable level. Obviously not acceptable. I assume the issue is the settings on the Transmitter 1. Can anyone recommend what line in settings I should try to alter on the Transmitter 1 using a USB stick? The system is currently somewhat unusable!
Thank you to our Sponsors
Hiss and quiet music with Transmitter 1 and Beolab 18
9 replies
Hi jamesjackson,1. Make sure that the Transmitter 1 has the latest software ( a few updates since introduced ),this has to be checked by B&O engineer.2. Try connecting another source to it.3. If still hissing looks like pcb 01 in the Transmitter 1 may cause the problem and has to be replaced.Pat
Thanks Pat
I did that and the sound works perfectly. I've tried using a Sonos with its variablr Toslink out and that works OK too. However, I want the Audiolab sound qualiry and 24k Hi Res decoding and for that I need the Audiolab preamp output. I have updated the Beolab firmware. I have tried to update the Transmitter 1 to make it always on and it will not accept the change. I am also unable to change the Transmitter 1 RCA gain from its preset -3 point. Could changing the RCA gain and/or the Input Impedance from High to Low work? However, when I follow the instructions the Transmitter 1 will not accept the changes.
FYI, I have worked out that you have to change the Transmitter 1 settings one setting at a time, such as:
;WPL-TX (svn:5309) Current Settings:RCA and TOSLink gain:-6
Great, is it ok now?
All working perfectly now and sounds great!
I have changed the RCA gain from -3 Db to -5 Db .
I have also changed the RCA trigger value to 100, the always on to true and the imput impedance to high. I suspect that it is the RCA gain change alone that has fixed the hissing problem. I will have a go at changing the imput impedance to back to low and the always on to false and see if that makes any difference; will report back.
Now I'm happy!
Hi guys I know this is an older post but I have the same issue
I took the transmitter into the dealer, reproduce the problem and they claim to have replaced the PCB under warranty but I still have the same issue.
Now I've seen this post I was wondering if one of you could explain how to change your settings on the transmitter1. Thanks Rick😁
In this manual you have the USB way of changing TR1 parameters:
https://www.manualslib.com/manual/931303/Bang-And-Olufsen-Beolab-Transmitter-1.html?page=24#manual
Location: Brittany - France
My B&O Icons:
Thanks mbolo01, I'll give it a go and let you know how I get on 😁👍
Please Log In to Reply
You must be logged in as a BeoWorld member to post replies to forum threads.
or
Join BeoWorld
Register to access the forums, reference material, and exclusive member benefits — including our monthly prize draw.
Become a Member