Should I add a Velodyne ULD-15 to my system?

I love bass. My current system sounds awesome. Freshly upgraded SDA 2B TL with the gear listed in my sig below. I own this Sub and have an opportunity to get the servo restored. Someone at Polk told me it might be nice if i sent the frequency to 40 htz. What do you guys recommend? Use or no? If i use it what would you recommend?
When i have had this sub incorporated in my system in the past (as is) it took away the fullness of the sound of the SDA's. I don't want to affect the way the speakers sound at all.
Thanks

When i have had this sub incorporated in my system in the past (as is) it took away the fullness of the sound of the SDA's. I don't want to affect the way the speakers sound at all.
Thanks

Polk Audio SDA 2B TL mod
Carver M 1.0 MK2 Opt 2
Carver CT Seven Preamp
Bluesound Node 2i
Abacus Aikido Custom Tube Preamp
Carver M 1.0 MK2 Opt 2
Carver CT Seven Preamp
Bluesound Node 2i
Abacus Aikido Custom Tube Preamp
Answers
I had a chance to buy this model too but I didn't have the money. 200.00.
I'm a believer in most speakers benefit from having a sub playing too.
Now With SDA's, I don't think I've ever had a sub playing with them also.
Interesting.
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Do you know what frequency i would need to set the crossover to?
Carver M 1.0 MK2 Opt 2
Carver CT Seven Preamp
Bluesound Node 2i
Abacus Aikido Custom Tube Preamp
Office: PC, EAR Acute CD Player, EAR 834L Pre, Northstar Designs Intenso DAC, PASS ACA Monoblocks, Denon UDR-F10 Cassette, Acoustic Technologies Classic FR Speakers, SVS SB12 Plus sub, MIT AVt2 speaker cables, IFI Purifier2, AQ Cinnamon USB cable, Groneberg Quatro Reference IC's
Spare Room: Antique Sound Labs Wave AV-8 Monoblocks, Tisbury Mini Passive Pre, Tjoeb 99 tube CD player (modified Marantz CD-38), Analysis Plus Oval 9's, Zu Jumpers, AudioEngine B1 Streamer, Klipsch RB-61 v2, SVS PB1000 sub, Blue Jeans RCA IC's, Shunyata Hydra 8 Power Conditioner
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