Quote Originally Posted by JoeE SP9
I'm not unhappy with my SP-9. It has been brought up to ARC's latest specs.
Actually, the final version was the MKIII. I had my MKII updated to that version several years ago. The sonic result is greater resolution, more bass punch, and a warmer tonal balance in the lower midrange. The list of changes and pics are found on the ARC database site.

SP-9 family

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