I have a pair of MS904 Floor standing speakers. One of the speakers is only emitting a tinny sound. I swopped speakers over and problem followed it. Also put another set of speakers in their place and all worked fine SO NOT THE AMP. Also put speakers onto another amp and same problem. Can anyone advise me why this may have occurred. One minute speakers was fine and the next it wasn't. I am assuming that I will have to contact Mordaunt Short and return for warranty/repair
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Without knowing what they're hooked up too.. SOUNDS like your uder powering them, OR over powering them. Look at the back of the speakers the wattage is what your looking for, look at your amp, example: 1000w speaker running on 50w amp = not good.
A few questions to help me help you: (1) Does the woofer cone move freely when you use your hands to move it (or do you feel friction)? (2) have you tried swapping the left speaker for the right to rule out the receiver as a cause?
It sounds like the woofer part of the speaker is bad, while the tweeter is still good. You are going to have to replace the speaker. Speakers are generally sold in pairs, so it would be best to replace both rear speakers at the same time.
You're going to need a multimeter/voltmeter and a 9v battery to do this. It's easiest to first find your constant and switched/ignition wires.
the constant, you can get ground from any piece of metal inside the
dash, and begin touching all the wires, one at a time until you get a voltage. The meter
should show 12v or just under. This is your constant. Do the same for the ignition/switched, but this time with the ignition on. Check the remaining wires until you get one at
12v or just under. To check now turn off ignition and the voltage should go away.
For the speakers, it's a little more guessing, but you can check them with a
9v battery. Start with any of the remaining wires and hold it on the positive terminal of your 9v battery. Now go through the remaining wires and touch them, one at a time, to the negative terminal. You should hear a pop from the speaker when you come across the pair. Note the colors and the speaker where it came from. Now move on to another wire and repeat.
You may come across a wire that will not pop when paired with any of the other wires. This could be your ground. Put it a side until you've figured out all the speaker wires. Now go back to the possible ground and use your multimeter to see if you get 12v with your constant wire on positive and the negative wire on the possible ground. If it does it's your ground. If not, it could be something like a dimmer, power antenna or remote line that isn't necessary in replacing a stereo.
The downfall of
doing this is that it doesn't tell you polarity. After you finishing
connecting the radio to the in-dash wiring turn it on. Listen to the
sound carefully. If it sounds tinny one or more of the speakers
polarity are incorrect. Try to determine which speaker/s sound tinny
and reverse there wiring. Check again and hopefully everything's
LOL. This is a common, easily solveable problem. Remove your cellphone or anything that emits radiation of any sort from the general area. Don't believe me? send a text message while sitting net to your speakers. It does this even if you arent sending a message because your phone sends intermittent signals to the cell tower. the radiation being emitted from the phone does weird things with the magnets inside the speakers.
Buy yourself some stand alone speakers, a base & two side speakers, they cheap these days, base speaker has buit in amplifier & plugs into mains, or get surround sound 5speakers & a base, again mains powered, loud enough to annoy neighbours on full. Built in monitor speakers are renowned feeble tinny sounds. Right click speaker icon, bottom right, on your desktop toolbar, open volume control, ensure volume sliders set to max.
Maybe your microphone is on and giving feedack of what it hears. Try disconnecting it and let us know what it did. Also once a pair of headphones ( believe or not ) cted like weak microphones. When you tapped them, big speakers made the sound. There was a dual plug for both large speakers and headphones to be connected to the green sound out. Anyway, tell us what it did after you disconnected the mic.