SpeakerTalk

David · Posted: Tue Aug 19, 2008 3:48 pm Post subject: KEF B110 voice coil? HELP

I just have purchased a set of Audiomaster LS3/5a.

On one speaker on loud bass passages I can hear distortion, which sounds to me like the voice coil is rubbing. It is particularly apparent in very low frequencies, eg. low A on electric bass more than string bass.
If I keep down the volume there is no problem, but when the volume is increased so does the problem. I am not talking earth shattering volume, but slightly above normal listening levels.

I opened up the cabinets and checked the mounting bolts on the B110, to make sure it wasn't rattling.

I also turned the speaker upside down which seemed to help the problem. It has only been upside down 1/2 day.

I am using a Dyna ST 70 with Audible Illusions Mod 3.

I can return the speakers to the seller, but after hearing them, would like to keep them if I can get this issue sorted out.

BTW, the LS3/5a make me seriously think of selling my BC1s they are that good.

Any thoughts about the problem.

Thx
David

ColinR · Posted: Tue Aug 19, 2008 4:09 pm Post subject:

You've diagnosed the problem of gravimetric sag yourself, well done Very Happy

.

Now you've just got to remove the baffle turn the B110A upside down and put it all back together.

Give it 6-8 weeks rest, if it's fine then.........

you've got a couple of years to find a replacement or rebuild/recone/refoam firm who can recentre or replace the voice coil and cloth suspension for when it eventually sags and starts rubbing again.

Rather than a couple of weeks that the seller might give you.

If the speakers are original it might be worth while turning the other B110A upside down too Wink

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David · Posted: Tue Aug 19, 2008 4:26 pm Post subject:

Thx Colin. They are original. The cases are not the best and the idiot that I bought them from damaged the inside edges with a screwdriver, but I can do some repairs to make them presentable.

I am glad I sold my Kan IIs. Whoever said they were competition for the LS3/5a was all wet.

I will see what I can do with the seller.

David

David · Posted: Tue Sep 16, 2008 6:31 pm Post subject:

Thx Colin for the tip.

The gravity solution worked and the LS3/5as are singing again.