I have re-read this thread and I'm still not certain I understand the sonic differences between the PX4 and the 300B.
I am currently using a Royal Princess 300B with a Mullard ECC32 driver. I have tried the vast majority of possible drivers but have only heard the RP 300B.
If I were to switch to a AVVT PX4 (or AVVT PX4 or EML PX4) what differences can I expect to hear?
If I could improve anything, it would be to eliminate a small bump in the low mids / upper bass and...