BL5 Noise problems

43 replies

Well the BL5s arrived on Sat so I said I'd report back.  Well, couldn't be more mixed.  Firstly OMG!  Turned up they sound amazing BUT.

Havent' totally thrashed them yet was warned not to by the installation team  "until they've burnt in a bit"  couple of weeks, to let them loosen up a bit ?   Taking that advice, have been going through a mixture of stuff.  During some quiet classical moments and in between some tracks I began to notice some hiss / crackle on one of the BL5s.  This has been fairly consistent from the mid bass speaker and sometimes a bit of transient noise appearing in the tweeter, mid range and low bass no change.  Then last night, having had them a little bit louder, at the end of the CD I heard some quiet on / off buzzing from both speakers.  I traced this last bit of noise to the laptop charger on the other side of the room.  Turned it off and hey presto, the noise / interference want away on the BL5s.   Today, the other speaker for a period of about 3-5 minutes displayed continuous crackle from the mid range speaker, then it went away.  Dealer is coming back on 13th Aug to investigate.

 So what does all this mean???   I have gone down a long list of possible causes and taken the following actions, which brought me to the conclusion that some fault or other with the left speaker (the first one I described) but now it looks like both are prone to electromagnetic interference of some kind.  See below first and any help appreciated in suggestions as to what I might do or the dealer might want to think about before driving the 100 miles or so to come and solve it.

If anyone out there has had similar problems, either with the BL5s being prone to this or their own house  mains / earth issues then I'd really like to hear them.  The speakers are about 7feet apart and my house is modern (8 years old) and is detached with at least 15 feet between each house.  Surely I don't have to build a 'Faraday Cage' around my living room or plant a 50ft copper spike in my garden and earth the speakers via two lengths of copper pipe :-(   If they're that prone to external noise then I've made a big mistake.  Fortunately, my dealer ordered two pairs of BL5s (by mistake) so can bring a fresh set on his next visit).

See the list, help really needed because right now I feel decidely sick !

====================================================

1. Disconnected all the digital input and wiring to just leave the powerlink.

2. I have recycled the power (even though the speaker does not use Microsoft Windows) :-)

3. Switched the offending speaker from the Left to the Right channel (input switch on the back). So now both speakers playing the Right channel. The noise problem is still present, only in the left speaker predominantly from the mid front facing bass driver, given the freq range that the noise is in.

4. Replaced the 10m Powerlink Cable with the 5m one. Still no change.

5. Swapped to use the second powerlink socket (both on the speaker and the TV). No change.

6. Used a different 240V wall outlet, no change.

7. Moved the offending speaker as it was near a vertical copper gas pipe coming down the wall which might have been acting like and antenna and upsetting the digital. By this time I had made up my mind that it is the speaker.

8. On the same digital theme, switched off my wireless router and all wireless devices in the house.

This no joke!!!!

 

Sounds like your speaker is sick. What a shame, given that you were looking forward to getting them in the house.

They should be COMPLETELY silent. Shielding from interference is important, of course. You might have something affecting them.

My CRT television in the den actually influences my Grado RS-1 headset. If I go downstairs and switch the TV off, a slight buzz in the headset disappers ...

So you might want to look into what could be causing interference. You'll need a replacement speaker, I think. Hang in there, you'll be very happy when it's all running.

And running digital coax and powerlink at the same time should have no negative effect. 

Thanks for getting back so quick.  The left one is worse. Noise is mainly in the upper bass range.  The right one only showed effects for the first time today (then I suppose I'm listening even closer now of course).  Yes I have a CRT TV (MX5500) but come on, doesn't nearly every house in the UK have a CRT in reasonable range.  Surely I couldn't have had two faulty BL5s delivered?  My worry is that you do have to listen out for this noise, obviously not able to hear it if the speakers are turned up a bit with while playing.  With CD on pause or between tracks and turned up full, the speakers play a tune all by themselves, made up of varying degree of transient noise.  So it must be bad earthing / shielding.  By the way, I'm a bit concerned that the AC leads / plug have plastic earth pin i.e. not earthed to the ring main?????  Surely it's not a case of the wrong type of AC leads being shipped in the boxes?

Hope this thread goes on a bit and ends up with me knowing for sure that I've got a duff pair or some good advice on steps to take to reduce the effects comes back.  Will feel a right prat if they bring another set and it doesn't solve the problem.

Tks

Hi

What is the speakers connect to?

Remove all Becom6000 chargers... and look out for other swhits mode power supplies

and you need to be a least 1 m away from the speaker, all speakers makes noise up close

Try to ensure that there is nothing else connected to the circuit that the BL5s are drawing electricity from. No refrigerators, AC-units or anything else that could be kicking off-and-on. Just a dedicated circuit feeding just them.

I'm not saying that a CRT television should affect them - just that it affected a headphone I have, which is very sensitive.

I take it you don't live under powerlines! 😁

They should be completely silent. If they're not, then the store should give you a replacement pair.

You could, just for the fun of it, go and get an inexpensive current "cleaner" from Maplins or Dixons ... 

Hi there Jackplug

I do not own a pair of BL5 (my wife don´t like them). But could it have something to do with the power link cable?? I mean that the BL3 has there own set of cable. On the plastic on the jack there is marked a little triangle. If you use other cables (without the triangle) I had interference problems. But after the change everything is okey..

Hope you will find the solution - defiantly your dealer.

Hang in there - please keep us updated

Dennis

I think it the cables too.  Book says have to use 'fully mounted' Powerlink "not the really thin type"  now that to me implies 'chunky' cables, like the datalink cables (7 pin) that connect up all my other bits.  Something about these new generation Powerlink cables that worries me, they look too thin to be of any use, for shielding etc.  So, I asked the guys when they were here, are these cables the fully mounted type?  Yes they said, the once supplied with the speakers.  What I really need to do is set the BL5s to work from the RCA line in connections and removed the Polwerlink inputs, then see.  Problem is, when I pull the Powerlink cables out, the speakers revert to standby.  Need to set the BL5s to option 1 not 0 I think.  Then plug in my CD player and just use RCA L & R direct into each BL5s (or some other bit of kit.  But then I also need the 'sync' cable between the speakers, as per the diagrams for 'non B&O' setup.

Nope, no overhead power lines near me and nope, no aircon or fridge on the same sockets. So unless the house has been wired by Steve Wonder then shouldn't be a major problem.  But I DO note the reply about 'other' switched supply devices.  Will look for the triangles on the cables.  Reassured to hear that someone else has had a noise problem that turned out to be bad cables.  The ones I'm using were brought by the dealer (5m). These have either little coils or capacitor / resister filters on each end about half an ince from the 8 pin plugs.  The 10m cables that they also gave me (with invoice for £60) which I didn't pay, tks,  DO NOT have the filters on each end.  BUT I've used both sets of cables and currently the 5m are connected.  Either way, the noise is no differenct whatever I do.  Tomorrow I'm going to swap the speakers and place the right where the left one is and vice versa to see if the type of noise seen with the current left one is replocated on the other speaker or not.  That way I should know if its the position of the speaker or not.   I did move it just a little the other day but no change.

Big dilema for me is that I didn't get the BL5s from my local dealer due to a previous fall out over a dodgy repair that resulted in a TV coming back to me fixed but scratched and dented!  They made good but not without a few exchanges of fax messages!!!!  So I got my BL5s from a previous dealer I'd used 10 years ago to whom I very loyal.  Problem now is they have to drive 200 miles round trip to sort me out.  But having said that, no hesitation at all, they'll be round ASAP  (13th), not bad going.

Why me?

 

Make sure cable being used is not the One marked with a triangle as this is mark three, you need to use fully wired powerlink which hopefully the guys would have used. you can tell if it is fully wired by the thickness.

You haven't got any dimmer switchs in the room which the cable route goes near??

Hi it's the right PL you use.

I would like to know what you have them connect to? an old device cut have some bad connections...

BTW if it's mrk 1 or 3 the BL5 don't turn on at all... so it the right about 4,5 mm (new) - 7,4 mm(old) Mrk 1 and 3 is 3mm and 3,5 mm

OK will do.  They do look thin, so that's why I asked the guys.  No they said, these are the fully mounted ones, the thinner ones are REALLY thin they said.  I can't imagine cables being any thinner frankly than the ones I've been given.

I will take one of the cables to the local dealer here for a second opinion tomorrow.

Thanks

 

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