The DR-25 is a great amp, just slightly dark sounding which is a plus with current hungry speakers that tend toward the bright side. I still own the one I bought new in 1989 and have used it with great success with Apogees and Thiels over the years.
It will sound much better using the SE RCA inputs rather than XLR as it is a single-ended design and the XLR inputs used a cheap opamp to convert the signal to SE since its designer, Dave Reich never intended for it to be used in this fashion. This is why it has a reputation among some for lacking sparkle and dynamic drive.
No need to change any jumpers on the inside of the DR-25 to switch from SE to XLR (or from stereo to bridged mode) as on the earlier DR amps. There is a toggle switch on the rear panel for that.
BTW - The DR-25, its siblings, and its predecessors were designed by the great Dave Reich. Glen Grue was the marketing guy that joined Classe about the time the DR-9 was released and "participated" in design decisions for the DR-25’s successor, the Twenty Five and its siblings (minor changes to the output stage from the DR series) after Dave Reich was ruthlessly driven away from the company that he founded.
Dave
It will sound much better using the SE RCA inputs rather than XLR as it is a single-ended design and the XLR inputs used a cheap opamp to convert the signal to SE since its designer, Dave Reich never intended for it to be used in this fashion. This is why it has a reputation among some for lacking sparkle and dynamic drive.
No need to change any jumpers on the inside of the DR-25 to switch from SE to XLR (or from stereo to bridged mode) as on the earlier DR amps. There is a toggle switch on the rear panel for that.
BTW - The DR-25, its siblings, and its predecessors were designed by the great Dave Reich. Glen Grue was the marketing guy that joined Classe about the time the DR-9 was released and "participated" in design decisions for the DR-25’s successor, the Twenty Five and its siblings (minor changes to the output stage from the DR series) after Dave Reich was ruthlessly driven away from the company that he founded.
Dave