Older vs. newer REL subs

I have a REL 212/se in my main system. It was the easiest one to seamlessly integrate, and definitely the smoothest and most tuneful sub I've owned...for music (I've had pairs of SVS and HSU sealed subs in the past).  If the 212 is indicative of the entire line, REL is still a music targeted product, and not one I would recommend for home theater use, unless you're shopping their newer dedicated ht line.

No experience on mismatching of subs... but you will like two... two do more than just add bass, they will extended the soundstage.

@ghdprentice  My goal is to arrive at matched subs. It's a question of getting another (older) REL 328 or selling that and getting two newer REL models.

@noromance Thanks. Faster is better in my low ceilinged space.

@yakbob My purpose is music listening only. That's why I have the REL 328.

Ive had a Rel in my system since the company started.The strata,storm,studio,q series,T series and now the new S series.The new lines are far superior hands down,im running S510s.Id stay with the S line and above if your funds allow.

I feel like I should contribute SOMETHING since so many people helped me with this decision back in 2015 when I had to replace an older, quality Klipsch sub. I dug around a bit and discovered that Bob Carver now made subwoofers. Audiogonites HEAVILY recommended the REL T9 over the Sunfire SDS-12 but a T9 was three times the price. $650 was suddenly $1900 so I went with the Sunfire.

That was background. Where this may apply to you is literally EVERYONE told me, regardless of brand, if you want to add another subwoofer, make sure it's the same brand and model. Don't spring for a REL T9 for the right channel then realize you're short and buy a REL T5 for the left channel. Do the smart thing and just by 2 REL T5's.

That makes A LOT of sense to me and it did then 6 years ago to everyone else so I assume it's still true today.