Different brand/model Sub(s) integration


I have an all analog setup, the speakers are 2 Tannoy Kensington and one REL s/510. 

I have a room mode at around 30Hz, that I can't fix regardless the REL's location. The only viable solution I can see is to add another sub, because the REL does not have DSP and no bass-trap can effectively absorb it.

Do I need to add another s/510 or I would be better off adding another brand with DSP so I can null the room mode? 

128x128astolfor

@oldhvymec +1 on the servo sub suggestion. Once you go servo you can never go back!

I am a robot.

 

@astolfor , The MiniDSP goes between your preamplifier and amplifiers (the amps in the subs included)

Servos on subs are only necessary when you are asking drivers to do things they do not ordinarily do.  It is a sign of poor or undersized drivers. Large well designed subwoofer drivers have no problem maintaining distortion levels below 0.5%. You run into higher distortion levels when you start asking drivers to take long excursions. If a driver is taking excursions greater than 1/2 X max than it is too small for the job. You can either use larger drivers or multiple drivers. 

I've not heard sub that sounds as clean and crisp as my Rythmik servo sub. So if that is wrong I am very happy with it being wrong!