I was given a NAD C740, and in hooking it up i found that it wouldn't put out sound. But when i turned it up all the way i got music. I currently have it hooked up to a DVD player and my computer, both out puts are performing the same. I have to turn it up all the way before i get any sound, and even then its very weak, they are running to KEF Q series speakers. It won't let me attach the owners manual, its not been helpful though.
So we now know the problem exists with or downstream of the receiver (not the fault of your computer, DVD, or input cables. Next, there are the speaker wires and the speakers to eliminate, done by either hooking different speakers (and wires) to the NAD or hooking the speakers (and wires) to a different amp.
Terrific!!! That is good news, maybe we can now eliminate the receiver. Check your speaker wire very carefully, if the exposed wire going to the receivers terminals is too long it could be shorting the the chassis or crossed with each other. If that isn't it then how old, how long, and how large is the wire?
Firstly THANK you Jim for all of your help so far. The speaker wire is a few years old, it came 2 6' cables and they are Monster Z series cables. I have not found any exposed wires, as they are double wrapped. No they are not crossed, and even if they were it still creates the same sound. Whether it is Red on Red, Black on Black, or Black on Red.
No problem with the help, it is why we are here I suppose.
So with way overly expensive wire like you have we can probably eliminate that unless (and I failed to mention this prior) it has been crushed somewhere along its length.
There is some high resistance going on somewhere and we are running out of explanations unless the speakers are blown for some reason (assuming they were given to you as well) The next step (without some other speakers to try) is to ask the person you got this gear from if there was a problem with it.
Well, crap! I talked to him and he said that last time he had it hooked up it worked wonderfully. He was using the same configuration I am using, as far as the speakers and receiver is concerned. I am going to get some other wire just in case that is the problem. The sound that is coming out of the speakers is quite clear, not distorted by any means. But it seams that it is just treble with out any base, and they are 8 ohm speakers connected the way KEF suggests. If you have any other suggestions for trouble shooting let me know.
this is interesting: I just looked at a backpanel pic of the c740bee.....there are A/B speaker terminals. If there is some leakage, and you are calling for 'A' speakers and are actually hooked up to 'B' terminals, you could get clear, very low levels. 1. Turn off. 2. Turn volume ALL THE WAY DOWN. 2. Speaker wires to 'A' terminals 3. check wiring again...I know you have 4. Turn on at LOW level. 5. let me know if this helped?
Michael, some day, and that day may never come, I will call upon you to do a service for me. Until that day accept this justice as a gift on my daughter's wedding day.
As a heads up, the headphone out working had very little if anything to do with if the receiver was working properly or not. The headphone amp is seperate from the power amp. If the power amp section was bad, the headphone section could still work.
"As a heads up, the headphone out working had very little if anything to do with if the receiver was working properly or not. The headphone amp is seperate from the power amp. If the power amp section was bad, the headphone section could still work."
That's true in about 90% of the receivers on the market. Most receivers and integrated amplifiers built in the last few decades have run the headphones from a dedicated headphone amplifier, usually a small 1-2 watt IC based circuit, rather than the actual output transistors of the power amplifier. Not all receivers operate this way but it's quite common in budget - read less than McIntosh priced - products. A few vintage receivers also run headphones from the power transistors of the amplifier and headphones are often placed in line with a "normalized" headphone jack that cuts off the speaker connections when headphones are inserted. It's a good idea to check the headphones when the speaker ouptputs are dead just to make certain the pre amp section isn't causing the problem but working headphones won't tell you much about the power amplifier in most receivers.