Originally Posted by craig john
You really have no clue how to set up a modern receiver. The OP's problem is that the sub is too LOUD. That is a level calibration problem, not a crossover problem. His system needs to be calibrated. He needs to run MCACC or get an SPL meter and use the receiver's test tones to balance the levels of his speakers and subs.
OP, see Page 20 of your manual for instructions for running MCACC:
It's very easy... just plug in the mic, place at your listening position, go into Setup, and selct Auto-MCACC. You'll hear a series of chirps, and then MCACC will set your calibration levels, speaker and subwoofer distances and set the crossover points, as well as EQ for your speakers. Just follow the instructions and suggestions in your manual.
You may need to turn your subwoofer down a little before you start, and bypass the sub's internal crossover, (or set it as high as it will go to get it out of the way), and let the receiver's crossover do the job. You don't want to cascade the crossovers; just use the one in the receiver. Also, set the Phase Control to "0" before you start.
BTW reading the manual will really help a lot, all you have to do to get to the cal menu is plug in the mic..
You will need to level match each sub one at a time.
So disconnect all but one and run the auto cal,
After the auto cal runs, check the subwoofer channel level.
Since you have twin A7s-450 subs(plus a couple of others), I am going to recommend that you shoot for a subwoofer channel trim level of +3dB after running autocal for each individual sub.
To achieve this... If the sub channel trim is less than +3 after auto cal reduce the volume control on the subwoofer and run the auto cal again.
Repeat this process until the AVR sets the subwoofer channel trim to +3dB.
Even if it seems like the sub volume is barely turned on this is the way to get your system setup correctly.
Disconnect the sub and connect a different one.
Repeat the cal process until you get that sub dialed in then disconnect and move to the next sub.
Do not adjust the volume control on any of the subs once you have completed this process.
Connect all the subs and run the auto cal again.
I would like to know what the AVR sets the subwoofer channel trim to now that all the subs are being used.
Hopefully it will not be much below -3dB, but in any case the system should sound significantly better.