I have the S30 mk3 OTL amp with the upgrade vcap and resistors. The break-in period for me lasted only a couple of days. I loaned the amp from a dealer and for the first day it really didn't gel and I was very close to handing it back.
However, day 2 was different and I started to really appreciate how revealing this amp is. I am using it with a Bent Audio TVC and Avantgarde Duo Omega horns which have a flat impedance of 18 ohms.
The imaging and dynamics of this amp are second to none in my system and I do not hear the hardness that you are referring to. In fact I would say that it is amazing how high you can set the listening level without and strain or hardness appearing.
I am using the amp in balanced mode with Anti-IC's and stock power cord.
Hope that helps in some way.
However, day 2 was different and I started to really appreciate how revealing this amp is. I am using it with a Bent Audio TVC and Avantgarde Duo Omega horns which have a flat impedance of 18 ohms.
The imaging and dynamics of this amp are second to none in my system and I do not hear the hardness that you are referring to. In fact I would say that it is amazing how high you can set the listening level without and strain or hardness appearing.
I am using the amp in balanced mode with Anti-IC's and stock power cord.
Hope that helps in some way.