The Dahlquist speakers in question were introduced in 74 or 75, and used some interesting approaches for the time. Believe they were 400. a piece. Many used them as a reference, and to this day, there are many who find the sound very special. If there was an audio Hall of Fame, the DQ-10's would be in it. Interestingly Dahlquist subsequent speakers never had anywhere near the popularity--not sure if Jon D had sold the company or what by then, but you have my friend an audio legend. Any good SS amp of 60 watts or side or more should be fine,
John