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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@kren0006 I think the R328 was a more expensive model at the time and so it's at the same level, perhaps, as the S5, now? If so, that's at least a rough analogy.

I'm not in the market to buy two $2500 subs to replace a single older $2k sub; I would entertain two newer $1500 subs, however. 
"I'm considering the T7x and T9x lines."

"But as often happens on this site no one actually answered the question that was asked in the op."

Unless you can get that 8 year old technology for a killer deal(at least 1/2 original retail), a pair current Tx is the way to go. The current Tx series is probably closer to the S series now than your current sub, which is still a capable sub. It also has a nice modern look.

My R.E.L B3 is stone age compared to even the "value" T series of REL. 2  completely different companies. Your sub is from the Sumiko years, and since then to present is its own company with even nicer offerings.

Why not a pair of Salk Sound Rythmik 12’s in the same finish as your Salks...

The PEQ will come in handy now that you are taking measurements.  The cabinets look wicked rigid too.

As far as Rel, I’ve had a T9i, an S3 SHO, and a T5i.  The T9i is pretty sweet and I imagine the new version is even better.  I’d imagine that you’d be pretty stoked with a pair of T9x’s.  
I do like the idea of newer subs. A Salk sub would be nice but 75lbs each? Probably harder to resell, no?
Yes, probably slightly (maybe moderately?) harder to resell the Salk but who knows.  Hopefully you wouldn’t want to sell them!  
And yes, 75lbs sucks to move around so theres that too.  Also, how long would you have to wait? And then there's size.  Quite a bit bigger than the T9x too.

I don’t bro, your call.  I do think a pair of T9x’s would be pretty sweet though.