There is no sound coming out of the rt. 750 tweeter. Left sounds fantastic.....right sounds muffled. any ideas? I disassembled and all contacts are tight, clean though suspect the array of wire coils/capacitors or whatever else is in this beast has developed a problem. All three speakers appear to be in perfect shape but I know looks can be deceiving. Any suggestions would be greatly appreciated.

Check the balance or fader control and turn it to the left channel and if that doesn't provide quality volume from the left try swapping the speakers.
If there is no improvement there is an amplifier fault...

I would say from your description that the tweeters are blown.
Can you take the speaker that sounds good and swap it out with one that sounds bad. If you do that and the good one still sounds good. You have a tweeter problem. And they would need to be replaced.

check you haven't got the wires on the back of the tweeter touching, Then check the rest of the wiring you may have touched. Jon

Check the speaker/s first. If found OK; check and replace the damaged component/s at its audio output section circuit board. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. Surf the site with patience.
http://electronicshelponline.blogspot.com/

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?

Muffled sound? Like no treble? Wires wouldn't cause it. Could be bad tweeters.

More specific details re: electronics, source(s) might help.

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.

Hi airnurse

If you are using a cassette deck for a source of music, then it will have dirty heads. This can be cured by using a head cleaner cassette. Muffled sound from the loudspeakers usually points to a faulty high frequency driver(tweeter). Is the sound muffled on radio or other sources as well. If so, then you have faulty tweeter(s) to any speakers that are muffled.

Of course in saying that, you should check that someone has not just turned the treble control all the way down, or the bass control alll the way up :) Pays to check.

I am more than happy to answer any other questions you may have about it, just give me a hoy :) If you are still unsure, or have problems, then before you give a rating for this advice, please get back to me and we can try some more things.
Thanks for using FixYa, If you consider the advice I have given you as sound, a FixYa rating is a great reward for my efforts to help you. Cheers.

regards

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.

You probably burned tweeters and damage midranges but before disasembly check equalizer