ARCHIVED FORUM -- March 2012 to February 2022READ ONLY FORUM
This is the second Archived Forum which was active between 1st March 2012 and 23rd February 2022
I have a NAD 7155 Stereo receiver and have acquired a pair of B&O Beolab 6000 active speakers. I was advised I could use both together successfully.I was advised that I could use the Beolab speakers with the NAD amp and all the normal functions of the amp (eg. volume, tone, balance, etc) would be available. I was to remove the two metal U-links from the pre-out sockets on the rear of the amp and save these for future use. Then, select 'LINE' on both speakers and connect them using an RCA cable to the NAD's preamp sockets, L and R.I have two speaker cables behind the skirting boards with out connectors on the end, so I have spliced some RCAs onto the end of them in a DIY kind of way! The RCA Insulated wire connected to the striped part of the speaker cable, and uninsulated RCA wire to unstriped speaker cable - at both ends (of course).https
I've attached both speakers to each other using a power link cable, and then each speaker individually into the NAD preamp sockets, one cable into the Left and the other into the Right. When the NAD is off, the two speakers buzz incredibly loudly if they are both on at the wall. When the NAD is on, the buzz lowers, but is still significant. I can hear the TV audio very clearly, but this drone over the top and when on mute is too much.Has anyone any bright ideas as to what the problem is? Are the speakers themselves faulty, have I wired them incorrectly? My existing speaker cables are quite thick and these RCAs are rather thin. Is that the problem? Any help and advice would be gratefully received.Thank you
Suspect it is most definetely the cables and you should order proper cables - Steve on this site can advise and provides excellent cables that dont humn!
So, I suspected that it might be the cables but I've determined that it just can't be. I've plugged in one speaker to the mains, selected LINE, and on inserting a phono plug (no wires attached), the huge buzz starts. I replicated this on the other speaker. I think I've bought a duff pair.
Ah, yes considering both are to be plugged into the NAD separately, I don't need the powerlink. The problem still exists, though!
Hi - try Phono/RAC > Phono/RCA (short leads if you don't have any decent thicker ones_ without any joins etc from the preamp out to the Line In on the 6000's - don't forget to set the switch to line in. That should then work.. It should work then without the hum or buzz. Most of the time hum or buzz in my experience is caused by cheap leads? or positioning of the leads if they are not quality next to transformers or such like. If teh speaker doesn't hum or buzz without anything plugged in then it should be ok.
Hi teej202,
Welcome to Beoworld! Yes, replacing the cables should resolve the issue, until this is done you won't really know if there is also a problem with the speakers. Please use direct RCA to RCA cables from the pre-out sockets of the amp to both speakers and remove the Powerlink cable as mentioned earlier in the thread. If you don't have suitable replacement cable, I have these available here:-
http://soundsheavenly.com/line-in-connection/6-av-processor-pre-amp-sonos-to-beolab-rca-line-in.html
Please set both speakers to "Line" mode using the switch underneath.
Kind regards, Steve.
Steve.
www.soundsheavenly.com
Founder of Sounds Heavenly Cables and Brand Ambassador for Bang & Olufsen
Sounds Heavenly are proud to sponsor BeoWorld!
Please check out my YouTube channel at https://youtube.com/soundsheavenlycables
as luck would have it I have beolabs connected to an NAD7240 which is of similar vintage. It should work fine with good quality RCA cables between the pre-out of the amp and the beolabs. You don't need the powerlink between the speakers. However a quirk of the setup is that with the NAD preamp turned off, you will get a buzz. Especially right after you turn off the preamp. In this case I solve it by having the beolabs connected to a power bar that I turn on after I turn on after the amp, and turn off before I power off the amp.. not really the whole B&O experience.