According to manufacturer specs M900u balanced input impedance 34 kΩ and BHK 300 mono blocks balanced input impedance 200 kΩ. If the preamp has high output impedance that may explains the Luxman doesn't has enough bass.
What does a subwoofer solve?
My previous amps were BHK 300 mono blocks. The bass they provided for my Monitor Audio PL 300ii speakers was exceptional. For several reasons I replaced the BHKs with a Luxman M900u. Very happy with the new amp, except for disappointing bass performance. Would a set of good subwoofers help resolve this, or do subwoofers only address a lack of bass in standard speakers?
Thanks in advance for any advice or suggestions.