Dear @dumbeat: So, now you are ok with the bass/low mid you were asking for.
Btw, the comparison you did it between the ATC speakers vs the Merlin is not at all a good reference because the Merlin is in reality a two way speaker where the ATC is a 3-way and more important than that is that the ATC are active speakers with dedicated amps for each driver, amps that meets the specific drivers needs. Big difference vs Merlin's.
There are other alternatives to achieve even better quality performance levels from your Merlin's other than the change you made it with the amp but if rigth now problem was fixed the is useless to post about.
Regards and enjoy the MUSIC NOT DISTORTIONS,
R.
Btw, the comparison you did it between the ATC speakers vs the Merlin is not at all a good reference because the Merlin is in reality a two way speaker where the ATC is a 3-way and more important than that is that the ATC are active speakers with dedicated amps for each driver, amps that meets the specific drivers needs. Big difference vs Merlin's.
There are other alternatives to achieve even better quality performance levels from your Merlin's other than the change you made it with the amp but if rigth now problem was fixed the is useless to post about.
Regards and enjoy the MUSIC NOT DISTORTIONS,
R.