I have been using 901 speakers and eq with onkyo tx-8522 av. but now when i turn on tape 2 monitor on, the sound become very weak, even i turn the volume to the max. when i turn off tape 2, the sound come back normal. i wonder if the av or bose eq is not working? please help

Welcome to FixTa!

Since your Bose 901 came with an active equalizer, turning the tape 2 monitor on, bypasses your Active equalizer and disabling the tape 2 monitor enables you to use the Active equalizer system. The primary function of tape 2 monitor lets you record whatever sources you play on your amplifer if you're using tape deck. Another function is it lets you use another equalizer on top of another equalizer. Hope this is clear and giva you more information.

Qualifier: I have 901's in a 7.1 setup and have written many posts on Fixya regarding how to do it right.

NEVER USE MAXIMUM VOLUME FOR ANY PURPOSE UNLESS THE RISK OF ACCIDENTAL SPEAKER DESTRUCTION IS A ACCEPTABLE.

ONLY now it does that? "VERY WEAK" as in attentuated somewhat or is it signal leakage, effectively silence? How is the EQ wired in? Check its own Tape Monitor button.

If you DO NOT have a separate amplifier for the 901's the EQ will affect EVERY speaker and we know that is NOT desired.

If the EQ is in a Tape Loop of a modern AVR and you activate the loop two things will happen: 1) the 901's will sound better and the rest of the speakers will be at risk from excessive amplitude at the extremes; 2) any digital source will be disabled.