I did a similar setup for the Magnepan 3.5. I use the Jolida 1051 int amp 100W for Bass and it's tape output to a Opera EL34 40W tube int amp for treble.
Operation wise - you just turn up the treble volume first and adjust the bass to fit the song style.
Not the best sound one can get but it's workable and for the Magnepan this setup actually by-pass the passive pre-amp for the treble but added extra pre-amp stage. I would say it's about 80% of a good active bi-amp setup which I tried with a Lyngdorf.
Operation wise - you just turn up the treble volume first and adjust the bass to fit the song style.
Not the best sound one can get but it's workable and for the Magnepan this setup actually by-pass the passive pre-amp for the treble but added extra pre-amp stage. I would say it's about 80% of a good active bi-amp setup which I tried with a Lyngdorf.