The Vandersteen crossovers are not line level but speaker level. Seems like a seamless path to me. I have had Vandy 3A's with 1 then 2 subs as well as my current Quatro's. Quite a bit cheaper as well
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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.
I use Rythmik subs, so I'll second that recommendation. SVS also makes a good value subwoofer at about $1K/pair (and a pair is better than a single sub IMO).
As to the best way to cross the subs, I'm going to go off script here and recommend a pre-pro with Audyssey. I've tried a lot of different approaches using pre-amps from ARC and Joule (among others) as well as some pretty expensive high-end x-overs, including Marchand. My Onkyo pre-pro is IMO far better sounding than any of the high-end set-ups. You may be stripped of your audiophile club card if you follow this advice, but I think it's the best way to go.
I have been running the JL CR-1 crossover for almost a year now with a pair of Focal 1007BE monitors and a JL e112 sub. To my ears it is very transparent and works exceptionally well. Lightens the load on the speakers which is what you might, and I say might need to run the Luxman with 20 watts. Yes it is expensive but is very good. I would first do as one of the other posts suggested and just try the Lux as is. It may just surprise you!
Dont get to hung up on the price of the subs . The size of your room will dictate a lot . I picked up a used Paradigm Seismic 10 sub recently . New retail a dozen years ago was around $1200 . Picked it up for $250 . Bought it for the hell of it , seemed crazy low price . Inserted in my main system with King Sound electrostatic speakers and has completely filled in the 30 hertz range seamlessly . How loud you turn the volume up is the biggest mistake made usually . Keep it really low . I would stay in the pro arena for a sub . Less fancy looking (pay less)
lots of great information here:
if you want to use an active XO, jl audio, bryston and marchand are the most common. if you're just looking for a line level high pass filter, Vandersteen makes a decent one (HP-5) but be aware of the slope - I believe it's only first order.
Another consideration is proper time alignment of the sub and mains. I ignored this for a long time, simply high passing my mains with the afore mentioned line level unit from Vandersteen, then a custom built set using V-Caps. Worked well enough, but I found a significant improvement in integration when I properly time aligned the mains and sub. Things really snapped into place perfectly - there is absolutely no differentiation between the sub and mains, just one perfectly cohesive soundfield.
Oranfoster---If a shallow-sloped (6dB/octave) x/o works for you, you can make (or have made) the most transparent one possible with a simple r/c filter. Just a single resister and capacitor per speaker, installed on the inputs jacks of your loudspeaker power amp. The value of the r & c is determined by 1- the input impedance of your amp, and 2- the x/o frequency you desire. The formula for computing the r & c values is all over the net.