A note of caution in regard to pairing the J2 with the de Capo BE: While the M2 and the J2 amplifiers are both rated at 25 watts into 8 ohms (or 30 watts in the case of the J2 depending on what document is looked at), their performance into 4 ohms is quite different. Specifically a substantial increase to 40 watts for the M2, and a substantial decrease to 13 (or 15) watts for the J2. Also, in the case of the J2, at high power levels distortion performance is significantly worse into 4 ohms than into 8 ohms, as shown in the graphs in the manual.
While the de Capo BE is nominally rated as being an 8 ohm speaker, its impedance in most of the mid-bass region, where lots of energy is typically required, is around 6 ohms (see the graph near the bottom of this page). Presumably the power capability and distortion performance of the J2 into 6 ohms will be somewhere in the middle ground between its 8 ohm and 4 ohm performance, meaning it won't be as good as is specified for 8 ohms. Also, per the measurements shown on that page the sensitivity of the de Capo BE is not nearly as high as specified, at most frequencies.
In general, to get the best possible performance from your J2 I would expect that speakers which are truly 8 ohms or more at most frequencies would be the best choices. Your Revels are most definitely not in that category, BTW, in addition to having low sensitivity.
Good luck. Regards,
-- Al
While the de Capo BE is nominally rated as being an 8 ohm speaker, its impedance in most of the mid-bass region, where lots of energy is typically required, is around 6 ohms (see the graph near the bottom of this page). Presumably the power capability and distortion performance of the J2 into 6 ohms will be somewhere in the middle ground between its 8 ohm and 4 ohm performance, meaning it won't be as good as is specified for 8 ohms. Also, per the measurements shown on that page the sensitivity of the de Capo BE is not nearly as high as specified, at most frequencies.
In general, to get the best possible performance from your J2 I would expect that speakers which are truly 8 ohms or more at most frequencies would be the best choices. Your Revels are most definitely not in that category, BTW, in addition to having low sensitivity.
Good luck. Regards,
-- Al