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SPEAKER FORUMS >> DM947 >> One of my Monoliths Just Died
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Message started by Rivieraranch on 06/16/19 at 02:00:39

Title: One of my Monoliths Just Died
Post by Rivieraranch on 06/16/19 at 02:00:39

The right speaker began to hiss and soon it decreased in volume, then stopped working altogether. Switched it with the left speaker to make sure it wasn’t a cabling issue. I unscrewed the back binding post plate and no wires are disconnected. How can I fix this total driver failure?

Title: Re: One of my Monoliths Just Died
Post by deucekazoo on 06/17/19 at 15:37:37

That sucks and is weird at the same time. The bottom speaker is run full range and the tweeter should have a capacitor on it to block the lower frequencies. If you have access to a DMM, check to see if the driver voice coil has failed. Check the ohms across the terminal of the main driver. They should be around 4 or 8 ohms. Depends on the DMM you have you can also check the capacitance of the cap. Did you get any sound out of the tweeter or mid. If they both failed you had a massive voltage spike. Email Steve or Bob and they should tell you the parts you need to fix this. You can get both drivers from Madisound.

Title: Re: One of my Monoliths Just Died
Post by Rivieraranch on 06/17/19 at 16:36:14

I’ll obtain a multimeter and check everything out. Since nothing is working the failure was massive.

Title: Re: One of my Monoliths Just Died
Post by BAndrade on 06/17/19 at 22:35:24

With your multimeter try comparing the capacitors, inductors and resistors on the crossovers one at a time with readings on the speaker that is working.

BTW is there a fuse on the crossover?

Title: Re: One of my Monoliths Just Died
Post by Rivieraranch on 06/17/19 at 23:57:32

Don’t see one

Title: Re: One of my Monoliths Just Died
Post by Rivieraranch on 06/18/19 at 02:23:53

“IT’S ALIIIIIVVEEE!”

Spoke to Bob. The jumper failed. Foam that separates the right from left side of the jumper failed so the four speaker terminals were connected preventing the speaker from working. So that’s why the speaker stopped putting out. Replaced the jumpers with wires and now the speaker works fine.

It’s nice to have such a wonderful group of folks who help each other out.

Thanks so much, Bob.

Title: Re: One of my Monoliths Just Died
Post by Geno on 06/18/19 at 15:27:39

Great news, Jim! As a former owner, I wanted to help, but couldn't imagine what would cause one to just stop working. So glad that you are back in business.

Title: Re: One of my Monoliths Just Died
Post by Acetone on 06/18/19 at 16:24:39

Good info to post....just in case I have same issue with my monoliths in the future. Thanks for posting!

Title: Re: One of my Monoliths Just Died
Post by Rivieraranch on 06/18/19 at 16:39:01

I advise anyone to replace those jumpers with wire or something else. I screwed down the posts and evidently the foam gave way, joining all 4 posts together.

Title: Re: One of my Monoliths Just Died
Post by deucekazoo on 06/18/19 at 18:02:01

You were lucky that you had them hooked up to a Decware amp. Steve was not joking when he said his amps can run a dead short because you just did. Glad it was an easy fix for you.

Title: Re: One of my Monoliths Just Died
Post by Acetone on 06/19/19 at 16:58:57

Ranch,

Oh! I guess I won't have that issue. I replaced jumpers with mapleshades soon after purchasing my monoliths and have not looked back. mapleshades made a nice improvement.

Title: Re: One of my Monoliths Just Died
Post by Rivieraranch on 06/19/19 at 17:42:54

My solution was a long solid copper wire I had laying around. It was just long enough to jump both speakers.