...got the opportunity to check the Yamaha website this AM and, good news...you are good to go...you do have pre-outs...simply feed the receivers front "pre-out" to the 901s EQ "in" jacks(NOT the ones labeled "tape mon") and the EQs "out" jacks to your outboard amplifiers inputs. There is a downside, you cannot connect a tape deck to the EQs "tape mon" ckt since the signal here will not be at a fixed line level and using 'phones or others loudspeakers connected to your A720 is also no-no. The EQ will always be in the circuit and the bass increase might damage them.
Originally Posted by captbill
Couldn't find any specs on the 720 so I'm not sure of it's power rating compared to the advertised 140Wpc of the HT unit. IMHO, having an outboard 2/ch amp with it's own power supply, chassis, etc. (as opposed to sharing it in a multi-channel unit) couldn't hurt...I have no concrete reason to support this, it's just a personal preference.
jimHJJ(...hope that helps...P.S. ignore the comments of the uneducated...)
Ignorance is bliss, look at all the smiling faces...
"Men would rather believe than know"-Sociobiology: The New Synthesis by Edward O. Wilson