You can also improve warmth with a very powerful SS amp to get the woofer in the sealed enclosure to sit up and bark. I have a friend who powers his DQ-20's with a Phase Linear 700 (Bob Carver's first product, 350 wpc in the '70s). Not only is it period-correct, it's a good sounding combination. Carver imitated the voltage swing capabilities of tube amps when he designed this amp, which is one of the things that sets the Phase Linears apart from other '70s power amps.
Between the early Dahlquists' sealed woofers and fairly complex crossovers, a lot of power and current can impart some bass extension and better dynamics and transients.
Between the early Dahlquists' sealed woofers and fairly complex crossovers, a lot of power and current can impart some bass extension and better dynamics and transients.