Multi driver transmission line question

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I just built some really sweet sounding mini tapered transmission line speakers with Peerless TC9FD. They sound so good that several friends and family members are begging me to make some for them.

They do sound amazing at moderate levels but at higher volume levels they start to seriously distort and sound harsh.

So before making a larger production run I want to make a version with 2 drivers per side. Both drivers will cover the low frequencies and one driver will be cut off somewhere in the mid range so the highest frequencies are covered by only one driver.

My question is; can I put these drivers in the same TL or is it necessary to isolate them from each other in two separate lines?

Off topic comment: Recently my brother gave me an old super heavy NAD T-753 which was quite a bit better than my old Denon PMA-710AE. Then I ordered a cheap Chinese Breeze Audio TPA3116D2 and to my astonishment it clearly outperforms the NAD. And with the right power supply it is as powerful as the monster NAD.
 
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