Question about JVC MX-J70 Shelf System

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Opening up Speakers

One of the tweeters on a main speaker has blown and 'buzzes'. I want to take it out to replace it, but I have no idea how to open up the speaker 'cabinet' on this system. There are no screws to be found anywhere. I can get the front grill off, but that doesn't help me at all. How do you open up the speaker box?

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I it wood or plastic? if you cant easily pry the 'screen' in front off and there are no screws, your best bet is just to find a new speaker box to put new speakers in... only way to open it is to tear it apart, unfortunatly.. if you do decide to open it, CAREFULLY cut the screen off with a razor or exacto knife, once inside you'll know better what your dwaling wiht...good luck

Posted on Jan 27, 2007

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Posted on Jan 02, 2017

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How do i tell if my problem if the high freq diaphram or the cross over


The crossovers in professional speakers don't fail that easily. It could be a blown tweeter. To confirm remove the metal grille-- remove the screws of the Horn Tweeter -- remove the cable connectors on the tweeter terminals ( Red and Black wire ). Now if you have a multimeter put it in Ohms range and touch the probes on the tweeter terminals-- It should show a reading betwwen 4 to 8 Ohms depending what is written on the back of the tweeter magnet. If you do not have a Multimeter you can take an ordinary cell/battery ( 1.5v ) from a TV remote and touch the terminals of the Horn Tweeter with the battery. + to the tweeter + ( a small red dot or mark will be there on the tweeter ) and -- to the tweeter -- . When you touch the terminals or give 1.5 volt supply the tweeter will make a scratching noise.
If you do not hear the scratching noise - it indicates a blown tweeter coil and will need replacement.See link below for spares:-
http://legacysoundservice.com/catalog1/product_info.php?products_id=1417
But if it does, you are in trouble and will need professional help from a electronic technician.
Could be blown HF Amplifier, suspect the crossover last. They seldom fail.
Revert back for more help

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Also, are you sure the tweeter's blown, and not a crossover component?

www.mouser.com carries many electronic components that could be used in crossovers.

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Yes. Most likely your factory speakers are blown as I've seen this many times. They are co-axials (2 ways) and the woofer part of the speaker is blown or the surround is rotted and only the tweeters are playing. I also believe that the front door speakers are low frequenct. Are they playing or buzzing?? Let me know and I can confirm this as the solution. You need new speakers.

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http://www.cybersoundsaudio.com/cybersounds/vehiclepics.html

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the best solution I've found is this:
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This method also works for the woofer but you need to be very careful to tap the frame or magnet of the woofer and not the cone.

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1 Answer

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