I believe that REL's HQ is located in Wales, UK. There is a division in Berkeley CA/USA for some R&D and servicing of older models, or so I was told a few years ago when I had one serviced there.
On the website they have a speaker pairing page to help determine which model is the best fit.
https://rel.net/speaker-pairing/
The Neutrik High Level Connector is definitely the way to go.
There are cable company's that build a better connector cable than the stock or REL Bass-line Blue cables. Source them on the used market.
https://www.analysis-plus.com/product/home-audio/interconnects/rel-subwoofer-cable/
https://www.synergisticresearch.com/
I fell into a pair of REL B2s - (10 inch drivers / 300W amp) two days apart on the used market, same color. Six months later took a pair of Tesla Le REL from Synergistic Research, also on the used market. Brought the experience to a another level.
Good Luck
On the website they have a speaker pairing page to help determine which model is the best fit.
https://rel.net/speaker-pairing/
The Neutrik High Level Connector is definitely the way to go.
There are cable company's that build a better connector cable than the stock or REL Bass-line Blue cables. Source them on the used market.
https://www.analysis-plus.com/product/home-audio/interconnects/rel-subwoofer-cable/
https://www.synergisticresearch.com/
I fell into a pair of REL B2s - (10 inch drivers / 300W amp) two days apart on the used market, same color. Six months later took a pair of Tesla Le REL from Synergistic Research, also on the used market. Brought the experience to a another level.
Good Luck