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? 

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@mijostyn, would the mini just attack to the subs and then EQ from there?

TIA

I think you need more than one sub, at least 2, the more subs will reduce your dead zone. Absolutely use a crossover with a high pass filter to your main stereo speakers. 

@fiesta75 I am going to get one more, but the question is do I need another s/510 or I can use another brand or model and smaller?

My suggestion would be to do a search in this forum for discussions about both "swarm" and "distributed bass array". This should point you in the right direction to not only solve your null at 30hz, but also improve the SQ immeasurably.

I'd go with another brand and or model. Different resonance frequencies are a good thing. For me it would be a larger one that goes down lower in frequency, but whatever you can afford would be an improvement. You're also going to need to experiment with various sub locations in your room.