I've got an old analog two-channel stereo receiver with a line output for a sub.   But since this receiver has no digital bass mgmt, the sub will need to filter out signals it can't handle.   So, what are some suggestions for a bargain ($400) sub with a built in crossover?   The SVS PB10-ISD was my first choice until i found out it has no crossover and depends on the source to cut out the high's.  
I'm afraid my only choices will be to step up to the PB12-ISD which has the crossover, or to buy a used 5.1 receiver and then get the PB10.  Either option doubles my budget and puts this whole thing off for a while.  
I would prob choose the second option since I don't think I'm getting the LFE track via the analog receiver anyway - which defeats half the fun of having the sub.   My room is 14x15x9.   I'm hoping there's a great little sub out there i'm missing, thanks for the help.