Our church was robbed and now we have 2 sets of speakers running off one amp. The amp is a behringer a500. 500 w, 8ohm as mono. 350w 4ohm as stereo. 2 speakers are bose 32se, 32w 6 ohm. Short run. The other 2 are unknown on a very long run to our kids rooms. Wired parallel stereo. The volume is very low. The Bose should be louder for sure. Is this a situation where i need another amp to separate the speaker pairs?