@ctsooner You are correct in the notion that it’s difficult to sell something like my 12 channel B&K amp. And you’re also precluded from using the many fine, better 2 channel amps out there (unless you want to buy 4 of ’em...). Getting into a Linkwitz system is a big commitment, but not as big as you might think.
I’ve heard the best of the best. I’m very fond of the big floor standing Avalon loudspeakers. But even the Eidolan model sells for $20,000 used, when you can find them. And of course you’re going to drive them with a power amp costing no less than $5000. Now you’re $25k into it and you haven’t even considered what speaker cable to use... That’s not a big commitment?!
Building a Linkwitz LX521 (which I consider to be equal to or better than the big Avalons) and even a new ATI 12 channel amp as Linkwitz suggests is less than $5000 total. You tell me which is a bigger commitment.
Heck. You could build 4 tubes4hifi ST-120, 60 wpc power amps for less than $5000 and have a total system cost under $8000 and still be $17,000 under the used Avalon system.
There are any number of choices for suitable amplification to support a Linkwitz design. When I first built my Orions, I ran four Hafler pro grade pancake amps at 50 wpc. I was able to score them for about $125 each. But one kept having problems and after 2 trips to the Hafler service tech, I decided it was time to do something else.
I saw the listing on EBay for a 12 channel B&K amp and I got it for $500, and it was from a local dealer, so I just drove over there and picked it up. I ran a 2 channel B&K ST-140 for almost 20 years and have always liked their sound. I find my B&K AV1260 to have a similar sonic character and one I’m quite happy with.
Linkwitz himself uses inexpensive class D amps.
So no. I don’t see how the multi-amp nature of Linkwitz designs really have to restrict anyone.