Subwooofer with Monoblocks set up question

One coveat (you might have already been aware) is, by doing so, the Rel sub hears (sees) the spare amp while your main speakers hears (sees) the Gato MBs.  Since the sub / main speakers do not hear (see) the same amp, is the high level connection advantage that the Rel sub is designed for is still there?

Yes. That question seems to cut to the heart of this, assuming i can mechanically get it to work. The alternative — going out of the Raven directly to low level —-will clearly work if i don’t use the Arrow, but that limits my placement flexibility. But the sonic difference between high level and low level in this case, as @lanx0003 crystalizes the point, may not exist at all, given that the REL will not be seeing the same amp as the speakers.

Further research tells me what i feared: the line level outs of the RCA cannot drive the high level input on the Arrow ; there is a serious voltage output problem and also likely a grounding issue and might actually damage the Raven’s output buffers.  (Unlike the Airship II, which has a low level input option, the Arrow accepts only the Speakon high level input or LFE/.1 input (designed for 5.1 systems the manual says). 

So i think I better find a longer RCA tipped interconnect (ideally a Y summing one)   to get from the Raven to the REL directly. Then i can compare the 2d amp jerry rigged approach to what now seems like a more sensible direct, low level approach.

Thank you all.

I am confused a bit.  HT-Air Mk2 is exactly designed for RCA.  Maybe you have different transmitter.  But two of these for $149 seems a steal.

@lanx0003 Alas, the Rel T/9x is not compatible with that wireless unit; it only works with the Arrow.

I am now wondering if i can fit 2 Class 98s in that room instead of the T/9x.  Then i could just connect them in the normal, 1 per channel/monoblock way.  I’ve never heard the Classic series though.  I created a new post-thread on that option hoping to hear impressions from those who have.

thanks again for all the advice and guidance!

Very interesting.  Only Arrow does not have low-level option.  Ha!  Wonder why Mr. Hunter did that.

I only tried two locations for my T/9x, including corner and inner side of the left speaker, recessed about a foot with another foot away from the front wall.  And I luckily found the 2nd position work the best after crawling over several other possible locations. (speakon cable is long enough to support that)  I never thought of wireless connection.

Learn something everyday.  Thank you, Kirk, and good luck again.

Really helpful, @lanx0003 .  I am home now and remeasureing things. I do have room for a 2d T/9x. So maybe that is the better approach.  

I also might have room to stack 2 S/550s, but that is a step up in cost.  I am going to ask REL if there is anyway to stack the T/9xs, because that would the very best solution for this room.