Originally Posted by email@example.com
For me, this is invaluable information as a potential 215RT owner. I LOVE my Orbit shifter and the 215RT is an itch that I am dying to scratch so that's why this feedback is so great.Sounds like a pro style amp (or class D for that matter), while still sounding great may not be the best option for an extremely smooth upper frequency if cranking which I do every weekend. Other issue though is the pro amps do offer EXTREME watts and on an inexpensive watt per dollar basis to run the 15" woofers do great levels so where do you trade off at. Wondering if the A51 had enough juice to drive the 15's to great levels of bass.
To be clear, I have 212s, not a 215.
All I can tell you is that the A51 gives plenty of power to 212s.
Also, nobody in this forum has really corroborated my preference of a high bias class A amp over a class D amp on JTRs.
In fact, there have been a number of 215 owners who felt that a pro high power amp was really beneficial on their 215s.
All that said, I liked the A51 with the 212s quite a bit more than the NC400s, even after room EQ.
I also liked the 212s MUCH more after fine tuning with Dirac. In fact, Dirac made a bigger improvement than the amp.
Anyway, to describe the difference more...
JTRs put out flat treble.
If the treble is harsh, it can be irritating if you don't roll it off.
If the treble is smooth, the treble isn't irritating...just clear and live sounding.
That was the A51 vs the NC400 to me, even after room correction to the same target curve, which normally made all amps sound the same.
A class D with a higher switching frequency than the NC400s might be able to sound identical to the class ABs on JTRs.
If I were to start from scratch with 215s, I think I would try Emotiva XPA-1s & an XMC-1. Emotiva has their summer sale going on (on top of those club discounts). The XPA-1 has lots of power and is high bias class AB. It may not sound exactly like the A51s, but I bet it would after some Dirac magic. Also, no fans!
The XPRs are switching amps, so following these theories, XPAs would be preferable.