I looked at pictures of the Tannoy FSMs. Hard to tell from pictures, but it appears to be a fairly complex passive 4-way design. On the back I see what look like 4 pairs of R/L speaker cable binding posts.
I have used a high-quality 2-way electronic crossover by Marchand (XM66) with my passive ATC SCM12 Pro monitors. I use the XM66 to split the raw line level signal into low-pass (<70Hz), going to a powered subwoofer; and high-pass (>70 Hz), going to a Wyred4Sound ST-500 stereo class D amp (w/jumpers connecting the low & high pair of R/L speaker binding posts.
The sub I’m using is a very capable, musical-sounding one for my small home office JL e110, and the ATCs are a great combination of highly resolving & musical. Through the Marchand crossover, I’m getting the best sound ever in a desktop system. Note that I also heard the ATCs direct (no active crossover & no sub), and that sound was also fantastic. I’m not sure I could tell them apart, honestly.
Marchand makes great products. For the real audio obsessive, you can upgrade opamps. I’m guessing either the 4-way XM44 of XM9 would do exactly what you need. In your case, you’ll need the crossover frequencies (which will dictate the crossover boards he’ll put in your unit).
https://www.marchandelec.com/electronic-crossovers.html
Final note: Marchand active crossovers use either 24 dB/octave slopes (XM9 or XM44); or 48 dB/octave slopes (XM44 only). These may well be different from the internal crossovers in the Tannoys. 24 dB/octave works perfectly w/my ATCs...
I have used a high-quality 2-way electronic crossover by Marchand (XM66) with my passive ATC SCM12 Pro monitors. I use the XM66 to split the raw line level signal into low-pass (<70Hz), going to a powered subwoofer; and high-pass (>70 Hz), going to a Wyred4Sound ST-500 stereo class D amp (w/jumpers connecting the low & high pair of R/L speaker binding posts.
The sub I’m using is a very capable, musical-sounding one for my small home office JL e110, and the ATCs are a great combination of highly resolving & musical. Through the Marchand crossover, I’m getting the best sound ever in a desktop system. Note that I also heard the ATCs direct (no active crossover & no sub), and that sound was also fantastic. I’m not sure I could tell them apart, honestly.
Marchand makes great products. For the real audio obsessive, you can upgrade opamps. I’m guessing either the 4-way XM44 of XM9 would do exactly what you need. In your case, you’ll need the crossover frequencies (which will dictate the crossover boards he’ll put in your unit).
https://www.marchandelec.com/electronic-crossovers.html
Final note: Marchand active crossovers use either 24 dB/octave slopes (XM9 or XM44); or 48 dB/octave slopes (XM44 only). These may well be different from the internal crossovers in the Tannoys. 24 dB/octave works perfectly w/my ATCs...