I can see how a better woofer could improve the sound of these.Check the operating frequency and impedance/efficeincy.The Dayton Reference Series are very good and are excellent in the cost/performance ratio.I also like the Aurum Cantus drivers.Much depends on the size of the opening and mounting arrangement.A similar size(depth) unit will probably mate better,as the alignment of the voice-coils will be similar (phasing).
