I think JBL M2 have too low sensitivity 92dB for horn + 15" woofer speakers.
This fact kills they advantages over box speakers.
Yes, they should have better high and low frequencies extension compared to typical horn speakers,
BUT
They will never sound as dynamic and alive as 97-100dB horn speakers and you can't use them with SET amplifiers.
I listen mostly jazz and classical music, and for this kind of music low mass old 15" woofers like where used in: old Altec, JBL L200, Tannoy Silver, Red suit better.
New heavy 15" woofers more suit for rock and pop music but they don't breathing and sound more simplified on midrange.
This fact kills they advantages over box speakers.
Yes, they should have better high and low frequencies extension compared to typical horn speakers,
BUT
They will never sound as dynamic and alive as 97-100dB horn speakers and you can't use them with SET amplifiers.
I listen mostly jazz and classical music, and for this kind of music low mass old 15" woofers like where used in: old Altec, JBL L200, Tannoy Silver, Red suit better.
New heavy 15" woofers more suit for rock and pop music but they don't breathing and sound more simplified on midrange.