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Old 11-19-2014, 12:36 PM - Thread Starter
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Help with SC-71 - Shutting Down Somewhat Randomly

Hi,

I recently purchased a Pioneer SC-71 along with a pair of B&W CM1's. I love the setup however the receiver shuts down at times and I don't what I'm doing wrong.

If I crank it up too far (at about 70%), it shuts down. But even at low volumes it shuts down. After shutting down, the iPod iPhone iPad light blinks while the receiver is off. In the Pioneer manual, it says "

I'm using Audioquest X2 speaker cable with Audioquest banana plugs. None of the banana plugs are touching. I'm also bi-amping the speakers. I have already 'told' the receiver to only have bi-amped stereo speakers connected to the receiver in the setup menu.

I have attached 3 pictures of the setup for reference.

Help!!!
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Old 11-19-2014, 12:41 PM - Thread Starter
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Forgot to add in what the Pioneer manual said for this issue:

"Check that there are no loose strands of speaker wire touching the rear panel or another set of wires. If so, reattach the speaker wires, making sure there are no stray strands."

"The receiver may have a serious problem. Disconnect from power and Call a Pioneer authorized independent service company."


Ami I doing something wrong? This is my first receiver setup so I'm not sure if it's an easy fix or not.
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Old 11-19-2014, 08:41 PM
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When bi-amping remove the jumper plates between the two speaker binding posts.
Better to leave plates on and turn off bi-amping. It is a mostly useless feature.
Either way you have it wired very wrong right now.
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Old 11-19-2014, 10:56 PM
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Remove the jumpers if there are 4 amplifier channels involved in this setup of two speakers.

You are creating a short-circuit between channels on the amplifiers.

I'll be back later...


links::: 1.5RQ > digits > 1177a > OpenDRC-DI > DEQ2496 > DAC2 > KCT > FPB 350mcx > reQuest > Sweetspot

Last edited by RayDunzl; 11-19-2014 at 11:01 PM.
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Old 11-20-2014, 06:17 AM
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Agree with both posts. The jumpers HAVE to be removed for biamp connections. your CM-1 manual also says this on pg 7
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Old 11-20-2014, 08:08 AM
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Undo the passive biamplification. It doesn't do anything useful and can do bad things as you have discovered. Read more here.
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Old 11-20-2014, 01:39 PM
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Quote:
Originally Posted by FMW View Post
Undo the passive biamplification. It doesn't do anything useful and can do bad things as you have discovered. Read more here.
I wasn't going to get into that in my reply but now that you did, I second your advice. only active bi-amping with ext crossovers accomplish anything meaningful. Passive biamping done in all receivers is practically useless.

I've done the math -- adding 2 amps of same power amounts to a mere 1.5 db volume and even that is at max power only. It makes a miniscule difference to perceived volume for vast majority of time when amps are running at 1 to several watts.

at max power, doubling the power is like increasing the vol knob 1.5 db.

and like you said, it complicates setups with no real benefit.

Steve
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