Bass gone...help (please)

[johnB]

Sounds like I've lost the bass through one of my Celestion 66s. (I was playing the 12" of French Kiss by Lil Louis, so that'll teach me to play bass-heavy House Music on a Sunday)

I've switched speaker cables around, so it's clear that it's the speaker rather than a problem with the source or the amp.

What's my next step please? Any suggestions appreciated.

Thanks

John

[rusty bearing]

Had the same in one of my PMC speakers. Checked the continuity on the coil ( if that's the right term?) and found an open circuit. It was as cheap to replace as have or try and repair.

[The Black Adder]

Could be a cap or resistor that's finally failed on the crossover. Check all connections to and from the crossover to the driver.

[johnB]

Thanks Mike and Joe
Looks like screwdriver and multimeter day tomorrow!

John

[walpurgis]

First take the bass driver out and check it with an AA or AAA battery and connect across the terminals, + to + on the driver. The cone should move forward noticeably, if not, there's your problem, it's likely blown (although I have seen lead in wires come away). If it's OK, then start checking the caps on the x/over and the bass connections to the x/over. By the way, the correct 12" Celestion units crop up on eBay regularly, so it's not the end of the world!

I must say, I've never heard of anybody blowing one of these. They can take a lot of stick.

[fatmarley]

I'd try the woofer in the working cabinet, that should tell you if it's faulty.

[johnB]

Thanks all.
Sorted now and sounding great.
One of the internal wires from the x-over to the bass unit needed re-soldering...which I (amazingly) managed.

Cheers
John

[Macca]

At least it was something straightforward and not a blown driver. Good for another forty years now :)

[walpurgis]

Wiped brow and gasp of relief I'd imagine! :D

Broken connections are quite common in speakers. Years of wires being vibrated around by sound waves I expect.

[The Black Adder]

Nice one son!... :)

[archiesdad]

Result:)