Jan:
I am not familiar with the rear panel configuration of your Musical Fidelity integrated amp, but if it has a pair of "preamp out" and "power amp in" jacks, then you can insert the crossover for the 2Wq between the preamp and the power amp.
If there is no such output/input loop for signal, then you will not be able to insert the 2Wq crossover, and will have to use a different subwoofer.
I am not familiar with the rear panel configuration of your Musical Fidelity integrated amp, but if it has a pair of "preamp out" and "power amp in" jacks, then you can insert the crossover for the 2Wq between the preamp and the power amp.
If there is no such output/input loop for signal, then you will not be able to insert the 2Wq crossover, and will have to use a different subwoofer.