Older vs. newer REL subs


Looking for any reports about older vs. newer REL subs.

I have a REL 328 (ca. 2013) which I bought used. It's a good sub.

https://www.hifiplus.com/articles/rel-r-328-subwoofer/

I would like to upgrade to stereo subs and I've found (finally) another REL 328 which would match mine. But, before I drop coin on that, I'm wondering if anyone has had experience comparing their older REL with a newer one. What's changed? What's better, worse, or the same? I'm considering the T7x and T9x lines.

Hoping for apples to apples comparisons, vis a vis driver size, type of sub (e.g. level of product line, sealed vs. ported, music vs. HT etc.) but whatever old vs. newer comparison you have much appreciated. 

Thanks.
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Showing 3 responses by fiesta75

tablejockey - The BK sub is pretty good and won't give you a hernia like the REL. The REL's are faster and clearer. Depends how much cash you want to drop and whether your back can handle it.
nmmusicman - Great analogy!
Personally I would buy the matching sub. That being said, the newer ones do perform a bit better.
I agree with missioncoonery. Phase on a sub if using below 35Hz. doesn't do anything from what I can tell. Just add more subs, that’s a much better idea.