More info is needed. What model is the other amp; what preamp are you driving the two amps with; is there an electronic crossover "ahead" of the amps; if there is no electronic crossover how is the preamp connected to each amp (e.g., XLR or RCA); what speaker is it; does "10 woofer" mean 10 ohms or 10 inches? Does the bass weakness seem to occur at any volume level, or just at high volume levels?
Regards,
-- Al
Regards,
-- Al