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Re: Marantz SR19 AV rcvr.failure
Before we get too far, have you tried unplugging the unit from the wall and then firing it up about 20 mins later. This will do a hard reset on the units processor. If the first thing to when a power surge locks up your electronics.
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The output of the Marantz will go to the input of the Carver. The Bose EQ has to go into a Tape Monitor on the Marantz, or, you can connect the Marantz output to the Bose line in(not tape in). The line output of the Bose, to the Carver input.
Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.
Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.
You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.
If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.
If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'nekkid'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.
You can hook up the speaker "between" left and right outputs. Just connect the center speaker between left +ve and right +ve outputs respectively. It will give a spacial effect that some like and some dont:) Try it and see for yourself. Your marantz amp will handle the load OK. It is rated 38 watts into 8 ohms, but there is not alot of load presented by this sort of setup. Let me know what you think.