I've had a similar situation with my SVS sub. I want to add a second sub, but don't want another cylinder shaped sub. I was told that it would be best to try to match the specs of the other sub. I do know, however, that a number of people here that have multiple subs have different models at least, if not different brands.

I think that as long as you have 2 (or more) quality subs, you should be ok with a little tuning.

Farewell - June 4, 2020