My nad T763 currently 11mnths old decided to loose output on both main speakers and rear speakers, but centre and sub output still work. but! centre and sub are either flatout or nothing. volume is flat out regardless of volume position unless it's at infinite db, and as soon as you move it 1 step of infinite it goes flatout again. protection circuit doesn't cut in and all modes work as normal. centre and sub obviously only work in surround modes. any clues anyone?
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Re: volume and multi channel output issue
Hi there. Are you familiar with board level repair for such products ? Your problem is most likely hardware. Either some of the final output transistors are fried, or it's a dsp problem, a regulator, a diode, a transistor in the circuit.. it could be a lot of things. But if everything was working fine and it quit someday without a change in the system's setup, it really looks like an hardware issue !
Do you have a way in the manual, that sets factory defaults, a kind of reset ? A lot of such units do have that. Try to unplug/interchange speakers as well, a shorted speaker could make the amp go nuts as well, but i wouldn't bet on it. Still, i'd check that out.
Hope that helps ! cheebster.
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Did you try to switch the loudspeakers? Before changing anything always lover the volume and switch off the amplifier. Assuming you tested already different inputs, you can be sure no cable from signal source is out or defect. (or did you nit check that first?). When the amp is switched off, disconnect the speakers and switch left to right and right to the left output.. If the other speaker is quiet now, you are sure it is in the amp. Still his can be anything. You can check the connections between the pre and main amplifier on the back side. When you have an extra set of interlink cables, perhaps you can cross the in and output there too. Take care every time you change something, lower the voltage and switch off the amplifier. Sudden clicks when switching on or changing anything can damage the amp and or the speakers.
Perhaps when you checked this you can locate where the problem is? Speaker, speaker cable, power amp, pre amp, (only a part of the pre amp.
looking at the manual i would assume that the mid-large box is actually your
Did you mean
that there are no connections left on the back of your amplifier? For a centre
speaker this system uses all passive speakers apart from the subwoofer which
has a built in amplifier for just the subwoofer, your hifi or home cinema
amplifier would need to have at least 5 separate channels to operate the centre
speaker as well as the front and rear speakers.
would need a 5.1 channel or 5 channel amplifier with subwoofer pre output, any
would do but to make things simple one with a digital optical or coaxial input
would be best as this can easily carry multi-channel audio with just one
alternative if your amplifier does not have a centre speaker output are:
get another basic mono stereo amplifier to power the centre speaker on its own however
if your main amplifier does not have a pre out connector for a centre speaker
you will have to change the volume independently on both amplifiers
Hey ajn1n1 we need to fine where the tinnyness is coming from Lets do a test shall we,
hook up your voice matched polks to your front left and right speaker outputs on your amp to see how they sound as mains. if you hear tinny then its the speakers. sometimes speaker need to be broken in a bit.
hook up your main front left and right speakers to your rear outputs. if you hear the tinnyness then its the output of that channel on the amp or a setting. Newer amps let you change speaker sizes in the menu so that it can change over the crossover for that channel.