New Rel T5i. Anyone heard them?

@murphythecat

A question here on the T5i and its ability to blend with speakers. I read your comments on SH forum with the T5i not being able to use with a Harbeth speaker because the crossover on the T5i would not roll off enough below 55Hz. I am not versed in using subwoofers, so I am rather confused about this. And I may not be understanding what you said.
What I am considering is to pick up a T5i to augment a center channel speaker in a home theater system. I would be using the Speakon high level connection cable. This would not be for the LFE track. The center speaker is a Polk LSiM706, which is rated down to 50Hz, -3dB. Basically, the goal would be to turn the Polk into a full range speaker. The sub would sit on the floor directly below the Polk speaker.

https://www.polkaudio.com/products/lsim706c

Could you comment on whether or not this T5i would or would not work with the Polk speaker for my purpose? The frequency response would not have to be perfect. It would just need to extend the bass reach of the Polk speaker.

@murphythecat
Thanks, well that's not good, since I wanted to use the REL's Speakon connection.  I wonder if I could keep the volume on the sub low enough to extend the center speaker's bass just enough.

Because the center channel, just like the front L/R and surround channels, is a full range channel, and it is independent from the LFE channel.  I like to hear the full frequency range of that channel.
The problem comes in particularly with deep male voice, a good example of which occurs with Russell Crow's voice in Mummy.  If you saw the movie at a theater, you know his voice in some scenes should be positively subterranean.  I don't think the LFE channel carries the lower frequencies of his voice.  And I have tried in vain to set crossovers on both subs and AV receivers to get that vocal quality in deep male voice.  The only way to get it is with a true full range center speaker.
I have seen a store demo of a HT setup in which they used the REL Ti series of subs to augment and extend the bass of the front L/R channels, and the improvement was great.  They employed a separate sub for the LFE channel.