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Hello. Slapping and it working is a tail sign that there is a loose connection, bad solder point, loose wire. When a circuit board gets hot, solder joints separate and an opening occurs in the circuit. Open it up and get a visual. Look for cold solder joint, make sure all the connectors are secure. Good Luck
Could be DC voltage on the speaker output line, but this will generally keep your receiver audio output turned off completely. Could be a bad muting transistor or microprocessor IC(computer within your NAD). If you are interested in having your NAD repaired, please visit my website at audioserviceclinic.com.You may contact me there. Thank you..
I'm also a Nad fan. I find this pretty odd that you should loose two in such a short space of time. The cutting out is due to the "protection circuit". I would be inclined to get your speakers checked out as if they are faulty or not "matched" to the amp, it will trigger the amp to "protect itself" and shut off.
I, too, have the 3150 and have experienced problems with it. With me the INPUT knob is touchy and needs micro turns sometimes to get both channels to come through. Also, it sounds like the pots are dirty as I get a scratchy sound while adjusting the knob. I have been told that these units are great middle of the road audiophile units. Actually, for the price of a used unit you can't do better. I just had an NAD 2400 THX amp delivered today and am using the 3150 as a preamp. My girlfriend is not feeling well and sleeping in the bedroom, though, and I can't listen to it :( The few minutes I heard of Steely Dan's Cousin Dupree made me bout **** myself (until I got the dirty looks). Sorry I wasn't more help! Goooooo NAD!
Yes these clips can be replaced. There are a number of suppliers on the net that provide speaker parts. Look around and find one that will fit. As long as the hole is filled (no gaps) the speaker integrity won't be broken. The exact shape is not important. Figure on $2-$5 for the part. If you are looking for the specific NAD part, that will be a bit more difficult. I'm assuming that the clips are on the speaker not the receiver. If hte clips you are talking about are on the receiver end, this gets a bit more complex. Try calling NAD service and ask for the part. It may not be cheap, but there should still be some around.