I think yes but you must set in your "1800 h av" speakers setup as "small" (not large) and crossover frequency at least 150Hz or higher (250Hz) to not destroy the 5 satelite small channels. Problem will be subwoofer, from pictures on internet I see that it is passive box (not active) sw amplifier is not in bass box but in "sony ht iv 300" deck so you will need an additional amplifier to drive it. If you dont have oter active sw(subwoofer) then I would not recomend it. Also for the satelite 5 speakers it might be that "sony ht iv 300" has some equalisation curve embeded so it sounds nice, more trebles. You might probably set it also in "1800 h av" if it has equaliser for 5 channels but you do not know the EQ curve.
