Need Repair Advice

[Jeff R.]

I am pretty sure I have either a fried crossover or else a blown driver in my MB Quart QLS1030 tower. (just one...thank god). It there a sure fire way to figure out which of the two is damaged, if not both. I am trying to figure out my best options to get these repaired. The local store I purchased them from is no longer around. I am still waiting to hear from MB Quart to see if they have any left over drivers and crossovers that I can purchase. If they do I want to be able to know exactly which parts are damaged with out just trying to guess or buy several things and find out it is something different.

Any advice......

 

[EJ1]

You could look into these guys, South Florida Speaker Repair.

http://www.speakersaver.com/

 

[highfigh]

If only one crossover died, and it's usually from over-voltage/clipping, you can use the other to copy it. If you were really cranking the schnikies out of them, it's possible that your capacitors have been badly stressed. If the labels are still intact, replacements are easily available from Parts Express, Madisound and other suppliers. If you can solder, you can repair a crossover. Drivers are another issue. If you don't hear anything from the tweeter, use a digital multi-meter to check it's resistance. If you see a number that's much higher than about 3 ohms (for a 4 Ohm speaker) or around 6 Ohms (for an 8 Ohm speaker), it may not be good and you'll need to replace it, if it's definitely out of spec.

 

[TLS Guy]

I am pretty sure I have either a fried crossover or else a blown driver in my MB Quart QLS1030 tower. (just one...thank god). It there a sure fire way to figure out which of the two is damaged, if not both. I am trying to figure out my best options to get these repaired. The local store I purchased them from is no longer around. I am still waiting to hear from MB Quart to see if they have any left over drivers and crossovers that I can purchase. If they do I want to be able to know exactly which parts are damaged with out just trying to guess or buy several things and find out it is something different.

Any advice......

I really doubt this is a crossover problem. It will be a driver. You need to find which. The best way is to disconnect the drivers and play one at a time.

Best is to use a tone generator and listen with the ear very close to the driver.

If you don't have a tone generator, then play some piano music, and listen carefully for distortion or buzzing on the piano transients.

Before you do that, push the cones of the drivers in and out with even gentle pressure. If there is any roughness or grating, then that driver has gap rub.

When you identify the faulty driver, see if MB Quart or a good speaker repair facility like Orange County will re cone it.