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.
128x128hilde45
Speaking of older REL subs...

Can anyone provide any insight to the BK electronics subs? They were the OEM builders of the orignal REL models?(as I understand, clarify if necessary)
https://www.bkelec.com/HiFi/Sub_Woofers/P12300SB-PR.html

They seem reasonably priced for what  they are. Not as high tech as the current REL, but seemingly competent. Looks like they still use the same driver from 15 years ago.



I have both a G2 and a Stadium lll and each has attributes that are unique to each. The G2 is fast enough to keep up with the 6 servo controlled woofers in my Genesis G500 speakers but I had trouble blending it with other speakers. The Stadium lll on the other hand has extension that provides a different acoustic signature and its speed blends better with most speakers. Think of the G series as a Porsche and the ST series as a Cadillac. The Stadium lll provides solidity and air and the G2 adds speed and definition.

Hope that helps
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!
My rule of thumb is ten years makes for a significant improvement in sound from a line or company or a technology (high-end stuff).
I read through this thread because I have a somewhat similar question .  But as often happens on this site no one actually answered the question that was asked in the op.