have four receiver's, hooked from, record out, to audio in, on each receiver, works great, to four set,s of speakers, three mains to three receivers, and rear tower's to last receiver, all work great as should, as was advised this site, however, i noticed an electronic heat smell one night, while medium loud, for a time, lead me to wonder, if to much was being drawn from first receiver, although,record out to auxiallary inin i assume, are mearly unamplified signals, one would not think this would strain first receiver in system, perhaps, it was one of my subwoffer's? any input, from those that are familar, with this type of system, or attempt would be welcome, just checking, for this is how, i got this far thank's to wayne and other's thank's again, sorry about grammer, spelling, capitals ect., just did not do well in typing class, hell what a'm i saying, any class lol