Joe, I sold many C2s years ago and still own L's.
I recall the C2s having the brightest inherent timbre of any OHM speaker save perhaps the E, which was a much lesser speaker. Not sure what the OHM C2 upgrade does in this regard, though I am certain it extends the low end.
My L's have the OHM sub bass activator tweak and a custom Morel woofer upgrade I installed myself. These sound best with good SS amplification I have found. Until I upgraded my amp from an older Carver m4.0t to the current MF A3CR (higher Current), I actually preferred the Ls to my Walsh 2s (100S3 drivers)for certain pop/rock recordings. The MF is lower watts (150w/ch) but higher current than the Carver (360w/ch) was. The OHM Walsh speakers need this to really shine.
Also, the Walshes need to break in and are inherently less efficient than C2s I believe, so they do require more power to truly thrive. I am not familiar with your Mac, but it is possible that an amp that does fine with the C2s may not do as well with the Walshes.
Aside from this, the presentation of the Walshes is totally different than the more conventional OHM box designs. That will never change.
I recall the C2s having the brightest inherent timbre of any OHM speaker save perhaps the E, which was a much lesser speaker. Not sure what the OHM C2 upgrade does in this regard, though I am certain it extends the low end.
My L's have the OHM sub bass activator tweak and a custom Morel woofer upgrade I installed myself. These sound best with good SS amplification I have found. Until I upgraded my amp from an older Carver m4.0t to the current MF A3CR (higher Current), I actually preferred the Ls to my Walsh 2s (100S3 drivers)for certain pop/rock recordings. The MF is lower watts (150w/ch) but higher current than the Carver (360w/ch) was. The OHM Walsh speakers need this to really shine.
Also, the Walshes need to break in and are inherently less efficient than C2s I believe, so they do require more power to truly thrive. I am not familiar with your Mac, but it is possible that an amp that does fine with the C2s may not do as well with the Walshes.
Aside from this, the presentation of the Walshes is totally different than the more conventional OHM box designs. That will never change.