Currently, your towers speakers are wired in parallel before arriving at the amp. bridging this 2 ohm load on the Syn-4 would result in each chnl seeing a 1 ohm load. The Syn-4 will not handle this load. The only way to run 4 tower speakers on your Syn-4 is either 1 speaker per chnl for 125W rms to each speaker or each pair wired in series and bridge an 8 ohm load, which equals the same power as 4 ohm x 4. You either need to swap the Syn-2 and Syn-4 for an SD-6 or run both the Syn-2 and Syn-4.....Syn-2 driving the Rev-8's and the Syn-4 driving the Rev-10's.
I would consider leaving out the Rev-8's and Syn-2 and just running the Rev-10's/Syn-4. Next to the 10's with 400W rms each, the 8's contribution will be minimal compared to the battery Ah consumed and space taken up by the amp. If you do decide to keep them, the SD-6 is the ideal route. it will deliver more power overall, yet be more efficient then the Syn-2/Syn-4 and take up less space.
I would consider leaving out the Rev-8's and Syn-2 and just running the Rev-10's/Syn-4. Next to the 10's with 400W rms each, the 8's contribution will be minimal compared to the battery Ah consumed and space taken up by the amp. If you do decide to keep them, the SD-6 is the ideal route. it will deliver more power overall, yet be more efficient then the Syn-2/Syn-4 and take up less space.
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