Robby,
There are multiple reasons why that will not work.
First, the HD1200/1 does not have the same upper end bandwidth as the HD750/1. You could not hear the difference at wake range. But you might be able to hear a difference while at rest, at least early in the day.
Second, you want to fall in the range of the amplifiers acceptable impedance load. And, if using multiple speakers on one amplifier/channel, you want each speaker to get the identical power. So any series/parallel combination configuration with any odd number of speakers cannot get equal power to each speaker. If you series all three speakers you will have greatly diminished power. If you parallel all three speakers you will have a final load of 1.33 ohm on an amplifier that is stable to 1.5 ohm. That might be close enough in some cases, like some simple inboat coaxials for example, but with a more complex HLCD & passive crossover the imedance is likely to dip well below 4-ohms per each speaker at certain frequencies. Keep in mind that the speaker impedance rating is nominal but by no means is equal at all frequencies.
I don't know what you are attempting to do but my guess is three speakes per each side with about 400 watts per speaker. If that's the case then six 4-ohm speakers could be driven to max potential by three HD750/1s.
If the numbers are different then also look at the Wetsounds multi-channel SD2 or SD4 or SD6 where you can run different combinations to best match the per speaker power requirements and stability.
Let us know what you envision on the tower.
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