Question about Mordaunt Short Speakers & Subwoofers

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Speaker muffled and distorted

One of my speakers appears to have blown. The bass end is quite muffled and basically sounds broken. All the connections are fine. No physical damage to the speaker. What do I need to replace to get them back in working order (just one of the speakers). And where can I get the part. Internet, or around london.
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Don't know about the type of your hardware, but your description is very light. In order to further isolate the problem, I would do the following:

1. Replace the speaker with a working one. If this works fine, then it is really the speaker that is broken. If however the intact speaker shows the same problem when connected to the same channel, then the amplifier/equalizer has an issue.

If it is by this confirmed that the speaker is broken look at step 2:

2. Inside the speaker there is usually a frequency separation filter. Either the bass loudspeaker is damaged or the filter. Ideally you could exchange filter and loudspeaker with parts from a working speaker box and find out by this which component is defective.

3. Once you have identified the defective component, try to find out the brand and type and perform an internet search.

4. If you don't find anything, bring the whole thing to a repair service, they can order the spare part.

If you are too lazy or technically not very skilled, go directly to step 4.

Hope that helps

Critter
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Posted on Sep 13, 2008

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No sound from tweeter bx5a


First of all, never connect the audio from your receiver directly to the tweeter. You can blow the tweeter instantly. The mid-bass driver can be damaged from a direct connection as well.

Since you get absolutely no sound from either driver, this seems to implicate the crossover. If the crossover has opened, no signal gets through, if it has opened early in the signal path.

But, it is also possible that a short exists, and that perhaps your amp cuts off the output having sensed a short. The short could be in the crossover or one of the drivers.

Here are some troubleshooting tips--

To prevent damage to your amp, turn it off while making or breaking any connections inside the speaker boxes.

Write down which wires get connected to which place on the drivers, so you can get them back where they belong.

With your amp turned off, connect the bad speaker to your amp. You've already verified that no sound is produced when both drivers are connected.

So, with your amp off, disconnect one wire from the tweeter in the bad box.

Briefly turn your amp on and listen for sound.

If you get sound, the tweeter is shorted.

If you get no sound, with the amp off, reconnect the tweeter in the bad box and disconnect one wire from the mid-bass driver.

Briefly turn the amp on and listen before turning the amp off.

If you get sound now, but not before, the mid-bass driver is shorted.

If you got no sound either way, check the DC resistance of the mid-bass driver (only, not the tweeter. Ohmmeters put out a small DC voltage to test resistance. That DC voltage might damage a tweeter, maybe. Don't risk it). Ohm the mid-bass driver while it is not connected to the crossover. If the driver is good, you should read some ohms--a little less than the stated impedance. An 8 ohm driver might read 6.5 ohms, for instance. If you get an open or a short (with the crossover disconnected from the mid-bass driver) you have a blown driver. Two actually, since neither the tweeter nor the mid-bass driver produced any sound in the previous tests.

If you can't get ahold of an ohmmeter, try this--

Open the good, working speaker and place the two side by side.

Connect your amp to the bad speaker box only.

With your amp turned off, disconnect the wires from the mid-bass driver in the bad box and connect them to the mid-bass driver in the good box. Disconnect one of the wires from the "good" mid-bass driver first, so you don't have two crossovers connected to it at the same time--even if only one of them will get powered on. It keeps the confusion down to a minimum when trying to isolate your problem. Oh, and disconnect one wire from the bad tweeter, in case it is shorted.

Turn the amp on and listen briefly before turning the amp off.

If you got sound, the "bad" crossover is fine, but the "bad" mid-bass driver is blown. And, since you got no sound in the previous tests, the "bad" tweeter is blown, as well.

If you got no sound, try it the other way around. Meaning--

With the amp off, disconnect the speaker wires coming from your amp from the bad speaker box and connect them to the good speaker box.

Your amp is now connected only to the good speaker box.

With the amp still off, connect the mid-bass wires from the good box to the mid-bass driver in the bad box. Remember to disconnect one of the "bad" crossover wires from its own driver first, so only one crossover is connected to the "bad" mid-midbass driver. Remember to disconnect one wire from the "good" and "bad" tweeters, so the only sound you hear--if any--is from the "bad" mid-bass driver, powered by the "good" crossover.

If this produces sound, but the previous attempts failed, you have a crossover problem.

If you still get no sound, something went wrong and you need to retest the good speaker by itself and back up a few steps and try again.

Assuming you got sound from the "good" crossover while it was driving your "bad" mid-bass, make sure no wires have come loose inside the "bad" box. Assuming you have sound connections at each end of each wire, you now need to desolder the electrolytic capacitors from the circuit board.

Make sure you mark them first, so you can put them back where they belong.

You can remove only one at a time, if that helps.

Use an ohmmeter to check some components.

The big red coil should read pretty close to a short, maybe one ohm.

The capacitors should read open or infinite resistance, although you might see a steadily increasing resistance while the capacitor charges up from the ohmmeter. If you read a steady low resistance on a capacitor after it has been removed from the circuit board, that capacitor is bad and must be replaced. The markings on the capacitor should give you some clues as to the proper replacement.

All things considered, I suspect that your problem is a shorted electrolytic capacitor. But, I gave you all I could think of so you can narrow it down and isolate the problem, whatever it might be.

I hope this helps.

Feb 23, 2011 | M-Audio BX5a Speaker

1 Answer

I have a problem with the tweeter sound in one of my VR975 Boston speakers. The highs seem to come and go. It is definitely limited to one of the speakers because I can switch cable connections in the...


Register and download the manual for free at retrevo.com'

http://www.retrevo.com/support/Boston-Acoustics-VR965-Speakers-manual/id/522dj380/t/2/

A loose or intermittent cable contact on the OUTSIDE would affect ALL speaker output, not just the high frequencies, and it would probably produce speaker-threatening crackles.

That loose tweeter connection the other guys found isn't fixed. Go back and make them fix it right.

What are your present speaker connection ends if NOT bare wire?

Feb 19, 2011 | Boston Acoustics VR965 Speaker

1 Answer

Main 5 1/4 driver cuts in and out, and distorted sound. what is the cheapest and the best way to fix this problem?.


probably the the wire connecting the cone and terminals at speaker are short.hold them with you fingers so that they cant move up and down with bass.if working fine then get them soldered.

Aug 23, 2010 | Mission 783 Main / Stereo Speaker

1 Answer

I think my speakers have blown they sound quite bad and no base to them can they be repaired or would it be cheaper to buy new they are monitor bronze br2 they are only 1 and half years old perhaps i didnt...


If a speaker goes "bad" it usually can not be fixed. Speaker systems use different speakers for different tones. This sounds like the speaker used for bass is not working. Check if there is a fuse in the speaker cabinet somewhere. Also, is there bass gone on both speakers?

Sep 12, 2009 | Monitor Audio Bronze B2 Main / Stereo...

1 Answer

Suddenly, my outdoor speakers sound kind of "muffled"


If these speakers are two or three way speakers, it is possible that the tweeter(s) are blown in them.
Try and remove cover to check.
If the sound is not distorting, but just flat and muddy its the tweeters.
Put the other ones on this channel, to make sure it is not the amp.

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2 Answers

No human sounds when playing dvds.


sound like the center channel is out
either bad connection at speaker or receiver is not putting out sound on center. A quick swap of speakers at receiver end will tell you if it is the latter

Apr 13, 2009 | Speakers & Subwoofers

1 Answer

Speaker has no bass


Make sure there are no wires that could be crossed (i.e. positive and negative).  Also check the speaker for any tears below the cone in above the magnet.  Hope this helps.  Good luck.

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1 Answer

Tweeters & Midrange Speakers


If you have a Ohm Meter, check the resistance to the speakers. If it is very high, the speakers are burned, (or the crossover is (just capacitors, and resisters...cheap)). If it is close to 4 ohms check the wiring and connectors..to and at the speakers, most likly the receiver/amp is not blown.

Apr 20, 2008 | KLH 1230SB Main / Stereo Speaker

1 Answer

JBL PSW D112 Distorted Sound


SYLVAN.

THE FILTERS /FILTRES ON YOUR SPEAKERS ARE TORN OR DAMAGED. IF YOU STILL HAVE WARRENTY ON THEY FROM JBL YOU CAN RETURN THEM FOR NEW ONES, PROVIDING THAT IS COVERED. IF NOT. I PERSONALLY RECOMMEND YOU BUY YOU SOME NEW ONES. REPAIRING WOULD BE OK, BUT IT WILL HAPPEN AGAIN VERY QUICKLY.

Thank you. Let me know what your decissions are

Nov 22, 2007 | JBL PSW-D112 Speaker

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