You can use a Velodyne SMS-1 subwoofer controller to EQ and cross the subs only - without touching the main signal path. If your pre-amp has multiple main outs, you can add a second output from your pre-amp to the SMS-1 and leave the connection to the Sarastros just as it is.
The SMS-1 includes a room analyzer - you need a monitor with an S video input to use it. Keep adjusting the x-over slope, frequency and EQ 'till you're optimized - you'll see a flat response on your monitor. If there is a good solution for your room without actively low cutting the Sarastros, the SMS-1 will let you find it.
If there is no good solution, you could adopt my arrangement: I use an NHT X-2 active analog crossover to low cut my main speakers. (It's both more benign and more flexible than the digital low cut in the SMS-1.) I then use the SMS-1 on just the subs, as described above.
More good news: The SMS-1 is $450 at Audioadvisor.com and the NHT x-2 is $300 direct from NHT. I'd say that's pretty reasonable in light of the cost of Sarastros and a pair of JL subs.
Good Luck,
Marty
PS - If you see a broad rise in the octave above 80hz (pretty likely IME), you might want to think about employing tuned hemholtz resonators (bassbusters). They can be a very effective fix for this problem that doesn't involve touching the signal.
The SMS-1 includes a room analyzer - you need a monitor with an S video input to use it. Keep adjusting the x-over slope, frequency and EQ 'till you're optimized - you'll see a flat response on your monitor. If there is a good solution for your room without actively low cutting the Sarastros, the SMS-1 will let you find it.
If there is no good solution, you could adopt my arrangement: I use an NHT X-2 active analog crossover to low cut my main speakers. (It's both more benign and more flexible than the digital low cut in the SMS-1.) I then use the SMS-1 on just the subs, as described above.
More good news: The SMS-1 is $450 at Audioadvisor.com and the NHT x-2 is $300 direct from NHT. I'd say that's pretty reasonable in light of the cost of Sarastros and a pair of JL subs.
Good Luck,
Marty
PS - If you see a broad rise in the octave above 80hz (pretty likely IME), you might want to think about employing tuned hemholtz resonators (bassbusters). They can be a very effective fix for this problem that doesn't involve touching the signal.