the cabinets has nothing to do with efficiency,like the alon II no frame helps sound correctness except that the alon actually needs a little more power because of the sealed boxed woofer,regular 3's have the same design except bigger woofer enclosure.
stereophile reviewer preferred the 2ce sigs over the basic 3,apparently the 3's had more bass presence but the overall presentation was found better for the 2 sigs.
used to run them with a 50watts high current audioprism tube amp and it performed really great especially at the price range.
do a search for the stereophile review don't know the issue number.
aloha! to both.
stereophile reviewer preferred the 2ce sigs over the basic 3,apparently the 3's had more bass presence but the overall presentation was found better for the 2 sigs.
used to run them with a 50watts high current audioprism tube amp and it performed really great especially at the price range.
do a search for the stereophile review don't know the issue number.
aloha! to both.