Speaker level is the way to go. I use a pair of Gallo TR1D subs approx. 600.00 ea in my winter system. I run my main speakers full range and tap the signal from the speakers to the subs and use the built in crossover. If you want to limit the power to your main speakers, then wire to the Gallo subs and use the built in crossover line outs to your main speakers.
The Gallo subs are sealed and extremely compact. In my room they put the punch into kick drum and go down solid to 25hz.
The Gallo subs are sealed and extremely compact. In my room they put the punch into kick drum and go down solid to 25hz.