major speaker problems --- need help

[johnnymegabyte]

Yesterday, I noticed my front speakers in my surround system were sounding BLAH.
For I while I've been noticing my centre channel speaker as being brighter sounding.
I had the speakers for 17 years.

What thery are : Acoustic Linear Systems Model 520 liquid cooled 5-200 watts
freq response 43Hz to 25Khz / 8ohms Impedence

• 4" Cone tweeter with high Frequency Control dial to the side
• 5 1/2" Mid range with Mid frequency Control dial to the side
• 12" woofer

The tweeter and mid-range aren't working / functioning. The woofer is all that is working.

So, I removed the front grill and the 2 speakers are mounted with screws to a plate, for each.
Once I inspected, they look prestine. No rips or tears, still nice and shiny.
However, I don't know about the two controls and the crossover. I'm not sure on connectivity and how it all works.

Is there a fuse inside that might have blown ?
Can the crossover "die" thus rendering the speaker signal non-functioning ?
Are the two control knobs the culprit ?

Ironic, it's the same on both speakers.

Any ideas ?

 

[Lt. Bob]

nice and shiny means nothing.
All the possibilities you mentioned are, indeed possible plus one you didn't. That the drivers themselves are blown.
First thing I would do is open it up and look for fuses. Don't know if those speakers have 'em but they might. If there are no fuses, then pull the drivers and check them to see if they work. If they do ....... then look for bad/broken wires or bad connections.
After that ..... it's gonna be the crossovers or the level controls.

You could also try simply working the level controls all the way thru their range of travel a couple dozen times. At that age, it's not impossible that they're dirty to the point of not allowing signal thru.
If that makes any difference at all ... then spray them with DeOxit.
This is gonna take a bit of time to track down.

 

[dementedchord]

4"cone tweeters???? i'ld save my dough and replace them...

 

[Lt. Bob]

4"cone tweeters???? i'ld save my dough and replace them...

LOL ..... no shit. I hadn't really paid attention to that but those are gonna be some mellow speakers even when the "tweeters" are working!