Beolab 5 upper bass on-off issue

22 replies
Hi Hope anyone can help. Beolab 5  .SW 2.6 Seeial 21... has bproblem that upper bass is going on and off ..at start all is ok after 10 min of playing it is starting to go on ad off. Aany idea what can be wrong? TThanks
Are you seeing a flashing red LED?  
No Led is green all the time. Totaly normal.
so you play music..... what sort? light orchestral or big heavy boom bass? for 10 minutes? no LED indication, then the whole speaker cuts out to standby (firm red LED)? or just goes fully dead with no LED change? or it continues to play the upper mid, lower treble and upper treble drivers? - just the 15inch sub goes down?
Led  stay green as normal in play mode. It paly's normal just upper mid- bas after some time cuts on and off. Like bad solder joit or bad connestion but i allready check that.  Maybe it is a litle sooner if i play loud yes.
I have known one of my BL5 to trip-out totally (red LED flashing) when playing very loud, very heavy bass.  It is Loudspeaker thermal protection. Fortunately, I did not have the problem if I didnt try to overload it and play normally. This is what the manual says.... The loudspeaker is equipped with a thermal protection system which prevents the units from overheating. Should an error occur, the system automatically switches the loudspeaker to standby – and the indicator light flashes red. To restore the situation: > Disconnect the loudspeaker from the mains. > Allow the system time to reset (approx. 3–5 minutes). > Reconnect the loudspeaker to the mains again. Should the problem persist, contact your Bang & Olufsen retailer. Regardless, it sounds like you have an internal fault and should get it checked out by an approved B&O service engineer.      
I repair  some B&O electronic.  But till now i had non of Beolab 5  to repair and that kind of error may be standard fault here ant there.  That are my personal speakers. Just hope for an answer from someone who has repaired that kind of error as here are some guys with a lot of knowledge on repaires :)
Thanks, will try. Some time agoo had been more on forum as now have less and less time. Hope Lee or any other legend can geve some hint ??.
Hi, I thought I’d post here given somewhat related. I’ve recently acquired a pair of BL5- does sound great to my ears. I’ve just noticed not much sound seems to come from the dome upper bass driver (the one below the larger acoustic lense) - the dome seems to vibrate a little but I can’t hear much if I put my ear close it it - unlike the tweeter and the 2 other bass drivers. Same thing on both speakers. i was curious if anyone else had the same experience ?  
or
BeoWorld Gold Membership card
Join BeoWorld

Register to access the forums, reference material, and exclusive member benefits — including our monthly prize draw.

Become a Member

December 2026 Prize Draw

Gold Members Only

As a Gold member you're automatically entered into our exclusive prize draw — your chance to win iconic Bang & Olufsen products. A unique benefit of BeoWorld Gold membership, every draw brings a new opportunity to win something special.

BeoSound Level

1st Prize

BeoConnect Core

2nd Prize

BeoRemote Halo

3rd Prize