Originally Posted by georgewang
I connected L8400P to pioneer elite 84 A/V receiver with a monster subwoofer cable. On the subwoofer, I connected the cable to "Line Level In" L (also tried R), and set "crossover" to 50 and volume to Max. On the receiver site, I connected it to "SUB W." terminal post in the "Pre OUT" section.
However, when I ran the "Auto MCACC" setup on the receiver, the subwoofer doesn't produce much sound, and the message I got on the setup screen shows an error and says "the subwoofer output is too slow or turn up volume on subwoofer".
I can't believe I didn't think of this first!
Those Monster sub cables are directional.
They have a ring, around one end, that has arrows pointing towards that end.
That end should be connected to the sub, if you don't see those arrows, look at the receiver end. If the arrows are there, its backwards.
I just relocated one of my subs, yesterday, from one system to another, and I use those cables. Which is what made me think of it.
Have you tried re-running the auto setup? There has been times with my H/K635 when I ran the auto setup that it didn't "see" one or another speaker, including the sub. So I would clear the memory and run it again.
Also, if you have the switch on the sub set for LFE the XO on the sub will be out of the circuit.
If you're not using the LFE position then the XO point on the sub either needs to be set higher than the XO on the receiver, unless the receiver is passing a full range signal thru the subout, which I doubt.
As Filecat13 has mentioned, toggle the phase switch to see if that makes a difference.
Another thing you can do to check the sub itself is to connected the sub to the receiver with speaker wire, using the speaker level inputs. Then connect the speaker outs to the mains. Set the XO on the sub to 50htz, I'm assumming your mains go that low, as that is what you did already.
Then go into the receiver menu and set the mains to large, and sub menu to none. Then play a dvd or cd. If the sub is working properly then you know the problem is something else.