I'd like some advice from the experts on a speaker question. At present my 970 is feeding two vandersteen 2Ce fronts through a Wyred4sound ST500, with LFE output to an SMS feeding 2 LFM-EX. I just purchased two Triad ceiling speakers to use as side surrounds. These speakers are jumper configurable to 4 or 8 ohms (manufacturer recommends 4)and rated for a maximum 100 watts. The speaker wire to their locations is @ 30 feet of 18 AWG. I've got a spare Acurus A150 (150W into 8) I would like to use to power the surrounds. So, am I at risk of damaging the surrounds if I configure them at 4 ohms with the Acurus? Do I need to attenuate the surround signal from the 970 in order to protect the surrounds? Do I need a lower power amplifier? Any advice will be appreciated.