I've been reading some of your articles and I've been wantiing to build a ML TL for some time. One my own pet projects have been mating FR with PRs. Yes, I'm aware of the drawbacks, but I just like the way a PR sounds as opposed to a port. I'm very partial to the bipole approach as well, which is ok for me, since I like the cheaper drivers. But then again, a PR is more expensive than PVC pipe.
I see some ML TLs that have forward firing ports and I've never been a fan of forward firing ports on BRs. Does the pipe length in ML TLs aleviate the problem that ports have with regards to midrange bleeding through?