Speaker problem

[J4CKO]

Have some old Tannoy 607s which I love that my sin has been using, he causually mentioned one of the bass drivers isnt working, I spotted one on Ebay so have ordered that as was only £13.

I had a look inside and nothign has come adrift rom what I can see.

Do drivers just stop working ?

Could it be the crossover ?

[megaphone]

Test the speaker driver by putting a battery across the terminals, 9v is easiest, the cone will move in or out depending on the polarity. Or if you have a meter test across the terminals, you should get continuity and it will likely measure 6-8ohms.

Yes crossovers can fail, so if the driver is good this would be the next thing to look at.

[TonyRPH]

The speaker has a voice coil attached to it. This coil is made of a (fairly, depending on power rating) copper wire as per below.

The coils can easily burn out and go open circuit when driven too hard, either by an under powered amplifier driven into clipping (distortion) or an amplifier with far too much power for the speaker.



And this is the cone with the coil attached:

[Boot]

J4CKO said:

Could it be the crossover ?

Not likely, but you'll know once you've checked the driver. Everything except the inductor is easily replaceable in the crossover.

[TonyRPH]

Boot said:

J4CKO said:

Could it be the crossover ?

Not likely, but you'll know once you've checked the driver. Everything except the inductor is easily replaceable in the crossover.

Indeed, highly unlikely. The inductor in the crossover is made of fairly heavy gauge copper wire (far heavier than the voice coil mentioned above) and in my 30+ years of working in audio have yet to see one open circuit. A bit charred from overheating yes, but not open circuit.

It will be the woofer, unless there is fuse protection on the crossover, but then it's likely there would be no output from the tweeter.

[J4CKO]

CHeers chaps, hopefully the replacement woofer will do the trick, love these speakers, we go back a long way !

[J4CKO]

My son was using these but has gone to Uni and is in halls of residence where they dont fit so I have them back, I was thinking of replacing the fronts on my home cinema setup with these, currently have a set of Wharfedale DX1 cinema speaker so what would the consensus be of swappign the front pair out for these ?

Will try it but would it be a bad/good idea, I suspect these produce as much bass as the sub with the DX1 package or not far off

[J4CKO]

resoved witht he new speaker off Ebay, top seller, £10 plus £3.50 postage, pretty much perfect and they live to fight another day.


Wonder what killed it, my son took them to his mates for a party so reckon they got murdered there and killed it, cone comes in and out fine, no outward sign of any damage.

[megaphone]

Coil has prob gone open circuit, or he fried it! Not uncommon. Cut the cone out and take a look at the coil, it should look like the pic posted above, if it's black a smells it's been fried.