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Thread: Jbl studio monitor 4435 |
    
New member Username: Mikecollins86
Post Number: 1
Registered: Sep-08
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| Posted on Wednesday, September 24, 2008 - 05:54 pm: |
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Hello all.
I've inherited a pair of jbl studio monitor 4435 speakers. They are mounted high and seem to have 'lamp cord' for speaker wire. They were hooked up to some cheap 'all in one' technics stereo system from the 80s.
When I turned it on, all I hear is a very weak, scratchy sound with no bass. Is there a specific way to test the speakers to see if they are ruined? Is the stereo simply not sending enough power to drive them? These things are HUGE and seem TOTALLY mismatched to the stereo so I thought that must be the issue (I hope...)
There is a second set of speakers that came with the stereo that sound fine (relative to how cheap they are...) so are the speakers blown???
Thanks! |
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Silver Member Username: Jrbay
Livonia [Detroit area],
Michigan
USA
Post Number: 399
Registered: Feb-08
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| Posted on Wednesday, September 24, 2008 - 06:07 pm: |
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You may have ruled out the stereo as the problem if the second set of speakers sound ok so all you have left is the lamp cord and the speakers. Let's hope the lamp cord is the problem.
Can the JBL's be removed from the wall? |
New member Username: Mikecollins86
Post Number: 2
Registered: Sep-08
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| Posted on Wednesday, September 24, 2008 - 07:49 pm: |
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Probably. I saw an ad for a speaker repair place here in orange county that said it could be the foam around the speakers. Would that make them sound all scratchy with hardly any output? |
Silver Member Username: Soundgame
Richmond Hill Toronto ...,
Ontario
Canada
Post Number: 148
Registered: Jun-08
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| Posted on Wednesday, September 24, 2008 - 08:07 pm: |
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Nope. Itchy and Scratchy comes from a sore throat, just kidding.
You need to isolate the problem. Right now, from your description, no one could tell you whether it is the amp, the wires, the speaker connections or the speakers themselves, much less if it's the woofers or the tweeters.
Can you try another set of speakers on the same amp and see if you get the same distortion with them? Alternatively, can you unhook the speakers and try them on another amplifier to see if they still sound distorted. To start with, do you have access to another set of wires to try hooking them up with that and see if the distortion is still there.
If it turns out that it is in fact the speakers that are damaged, a refoam will not get rid of a scratchy sound. A scratchy sound would most likely come from a damaged or blown voicecoil in either the woofer or the tweeters or possibly oxidization/rust between to voicecoil and the magnet.
Can you tell if the scratchy sound is coming from the tweeters or the woofers or both? |
New member Username: Mikecollins86
Post Number: 3
Registered: Sep-08
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| Posted on Wednesday, September 24, 2008 - 08:28 pm: |
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they are high above so I can't really tell, but it's obvious the foam has completely disentegrated. it 'seems' like the muffled/scratchiness is from both. it is also muffled/scratchy in BOTH speakers.
I will bring in my receiver from home and hook them up and see what we get. |
Silver Member Username: Jrbay
Livonia [Detroit area],
Michigan
USA
Post Number: 401
Registered: Feb-08
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| Posted on Wednesday, September 24, 2008 - 08:45 pm: |
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The deteriorated foam suspension material will cause most of the problems at high volume levels in that the bass response will be somewhat diminished and the cone may become unstable at REALLY high volume. This is not your immediate problem and you are on the right track on troubleshooting.
Can I ask where these things are? Is it possible that the speakers were played using the Technics at very high volume? A poor amp, distortion, and high volume is a good recipe for smoke!
BTW- Itchy and Scratchy come from...
The Simpson's!!!
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Bronze Member Username: 900ss
Post Number: 15
Registered: Jun-08
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| Posted on Tuesday, September 30, 2008 - 09:33 pm: |
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You can be sure they're blowd up. This brings me back to my youth, hooking up a pair of large speakers to a small cheap amp or receiver in hope of getting huge sound will cause this every time. A few minutes of large distorted sound a few beers maybe a doobie and everything sounds great, till the morning, then cha ching $$$
Do you have a good amp to drive them?
If not don't bother on the recone kit, or buy a few kits, ya get good at it but watch the glue
Brewster |
New member Username: Racer25
Post Number: 1
Registered: Oct-08
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| Posted on Wednesday, October 15, 2008 - 07:38 am: |
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Where would anyone recommend getting a refoam kit for the 4435's? I want to refoam the bass speakers myself. Are all refoam kits the same? I want good quality.
Thx |
Silver Member Username: Jrbay
Livonia [Detroit area],
Michigan
USA
Post Number: 450
Registered: Feb-08
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| Posted on Wednesday, October 15, 2008 - 07:44 am: |
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http://www.speakerex.com/ |
Gold Member Username: Dmitchell
Ottawa,
Ontario
Canada
Post Number: 1595
Registered: Feb-07
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| Posted on Wednesday, October 15, 2008 - 10:10 am: |
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Most likely the woofers are blown on both speakers. The sound you describe is a lot like the sound coming out of my Sttafs when I smoked both woofers. |
