Diagnosing speaker problem

[fisher X 100 A]

I thought I would start a new thread about this speaker - maybe get a little more coverage and maybe an idea about what could be wrong:confused:

I will apologize now for my limited Hi-Fi describing words in advanced.


Symptoms -

Distort/vibrate (?) bad on heavy bass. Speaker does this in and out of the cabinet.

When I depress the speaker manually it makes an clicking sound - this happens when the speaker is on its way back to neutral and not while depressing downwards.

All symptoms happen in or out of the cabinet - when the speaker is rotated 90 - 180 degrees - connected or disconnect.

Here are two vids of the sound


Manually depressing the cone

http://youtu.be/RIkXZBQbuZg


Speaker livened up - last 5 seconds is the best for bass vibration?

http://youtu.be/UheeNMvv4u0


Questions.

Are the two noises related or separate. Like the clicking sound is something caught and the bass sound is the speaker surround stuffed for example?

What will happen if I take the red highlighted screws off the back. Will this allow visual access to inside the speaker?

What will happen if I touch the yellow allen head bolts?

Have had a look around the WWW but I could not find a detailed instructions on how they are put together.

7443

Any advice is better than none!

Cheers

Shane

[cloth_ears]

Hi Shane,

Now that you've identified the problem as being the driver itself, it's probably time to send it and the one in the good speaker off to a specialist driver repairer.

The reason for sending both is that even if the correct original parts are used as replacements, there still might be a difference in the sound of the 2 drivers due to the different age/use of the parts if only one is repaired.

At least you know what you'll be getting for Xmas now.

Regards,
Brendan.

[fisher X 100 A]

I hear ya - the problem is I live in the middle of no where, and have been burnt by two Hi-Fi shops in New Plymouth already.

The best was when the valve amp was having problems.......spent 400.00 at one shop, still not happy I took it back. After a couple of months I rang up to be told by one guy he was working on it and pick up tomorrow. Went to pick up and the boss told me again there was nothing wrong with it.

Plugged it in at home, sounded like shit. Someone suggested Clarry - so sent it to him who informed myself that the output transformers were shot. Went back to the shop to air my findings, he asked for proof, showed him, then he asked me to leave and not come back!

Actually I have been burnt more than 5 times while adventuring into Hi-Fi - and now a little shy.

I would like to get a generally understanding of what this problem is, and MAYBE have a go at fixing my self.........

If one was to suggest a reputable person to fix Tannoy speakers who would you suggest?

[DodgyConnection]

The way you were treated by that shop was just not acceptable - what was the $400 for?

As for the speaker - it sounds as if the voice coil is rubbing. I have had great speaker repair service from Axent Audio in Auckland - but that would mean packing them carefully and sending them there. You would have to bolt them together face to face, then wrap them tightly in a plastic bag and then place them in a box with lots of polystyrene balls (the bag stops the balls entering the speaker) so the is no movement of the speaker. I have sent drivers like this but it has a degree of risk and depending on how heavy they are can be costly!

Some speaker problem info - http://www.colomar.com/Shavano/recone.html

[fisher X 100 A]

The way you were treated by that shop was just not acceptable - what was the $400 for?

He said for work that needed to be done, replacing caps etc.......I ask why then is sounds like crap?.....preceded to say "that's the sound of my amplifier!:mad:

I hate asking other trades people what they think of previous work done, but Clarry thought f*%k all was done in replacing old parts. I would also think Clarry would not want to speculate too much either - well within his rights too.:)

Excellent idea about bolting both together!.......Probably send up and then drive up to pick up to void damage on courier coming home!

I would love to try this myself unless there is overwhelming evidence I would f*%k it up.

Just suxs as I have one assignment left due before next Wednesday, have no music (pulled the national out to run one of the Tannoys, suxs just one speaker), t.v is to distracting and all I can think of is our poor Tannoy; sick and limp:(

[fisher X 100 A]

Ok.....found this thread

http://www.freewebs.com/filtonacoustics/k3809rebuildto3839.htm

Is it as easy as they say...................

[RexJ]

Go for it. Some words of advice though.

1) keep screwdrivers and anything metallic away from the magnets as much as possible. Use both hands when undoing screws.

2) remove the magnet very carefully, straight out, DO NOT twist it.

3) matchmark everything with a pencil, so you put it back in the same orientation.

4) mark and label everything, so they all go back in exactly the same place.

Good luck.

[DodgyConnection]

Go for it. Some words of advice though.

1) keep screwdrivers and anything metallic away from the magnets as much as possible. Use both hands when undoing screws.

2) remove the magnet very carefully, straight out, DO NOT twist it.

3) matchmark everything with a pencil, so you put it back in the same orientation.

4) mark and label everything, so they all go back in exactly the same place.

Good luck.

Very good advice here - if you can, use a plastic screwdriver or a very well insulated one when doing ANYTHING around the HF diaphragm - otherwise your screwdriver WILL attract to it and you WILL dent it.

Believe me I know :)

[fisher X 100 A]

Have everything apart - and have photos but cannot see them when I post..............arrggghhhhhhhhhhhh

[too_tall]

good luck.

I have rebuilt heaps of PA speaker drivers, but never a hifi, dual concentric one.

I guess its similar in concept.

PA speakers are easy and not overly time consuming, although of course, they are kind of made to be serviced easily.

[omegaspeedy]

Fisher, how did you go with photos and the driver? Send MJ a PM, he should be able to see what the problem is with your settings??

[fisher X 100 A]

its still sitting in front of me in bits - waiting to post photos of it.....to me, there are no scrap marks, nothing looks burnt and the cone itself still feels stiff to push in and out. The clicking sound is still there with the driver off.........weird?

I will private message MJ

[cloth_ears]

A click could be caused by a split orsome other issue in the spider. Might be hard to see.

[omegaspeedy]

The voice coil isn't rubbing on the centre co-axe tweeter is it? If that was at all possible.

[fisher X 100 A]

MJ is looking into my misfortune about posting photos.

[fisher X 100 A]

The little golds are really easy to get into

7495



Looking downwards at the spider - very clean, been around the spider with a torch looking for a tear. Could not locate one.

7496



Looking from the backside down the drilled tweeter holes. The gap is even all the way around and no debris.

7498



Looking down towards the tweeter cone. Even gap around the magnet and tweeter.

7497



Both coils look immaculate to my inexperienced eyes. Different wire used hence the different colour - apparently that aluminum cone can operate at a very high temperature, special glue used to hold it on......

7499



The speaker feels very tight when depressing - indicating to me it still stiff? But then again I do not know what they are suppose to feel like!

I am wondering if the x-overs could give the speaker the vibrating sound on bass?

The speaker still has the click sound - going to set up a brighter torch and jig for the speaker and go over every mm to see if I can spot something!

Next step unless someone can suggest another angle is too swap speakers around in the cabinet and see if the problem follows speaker or stays with the cabinet.

[fisher X 100 A]

"Bitch Slapping" - that is what I call it!!

I am hoping the glue has come away from the cage and the speaker surround, causing a slapping noise against the cage when heavy bass is introduced!

[Luis]

stop playing reggae man, then you'll be A-OK.

[Papa Hemi]

or is it Bob Log III?
http://www.youtube.com/watch?v=mu8w4Wlx0Nk&feature=related