JA Perspectives VS Tyler Acoustics Linbrook Sig System

I wouldn’t downplay the significance of the proprietary JA Infinite Slope crossover.  To my ears it gives the speakers a special sound that sets them apart, so I’d buy used Perspectives but that’s me.  The JA Profiles would also be high on my radar if buying new. 

I’d actually guess — and it’s just a guess — that the new LSA-20 (from Underwood Hifi) may sound more like the Perspectives than the Tylers as they seem to be doing some similar variable-slope type things with the crossover.  Since they’re sold direct they’ll be very price competitive as well.  Hope this helps, and best of luck. 

The Perspective’s crossover still operates on the basic principles of the patented Infinite Slope design — common to all JA speakers — with tweaks to the slopes for more optimized performance (this is paraphrased from what Jeff Joseph told me in person).  The crossover remains the key to the JA sound as the cabinets and drivers, while very good, aren’t anything unique or special.