For REL setup experts
Buck - not all McIntosh amps have the same output configuration. Your 402 like my 602 has fully floating transformer outputs that aren’t referenced to chassis ground anywhere.
So the REL speaker level hookup just doesn’t work in this case. It’s a REL design defect.
REL needs to use balanced differential inputs for their speaker level connections which would solve the problem completely and simplify user hookup. Other sub manufacturers do exactly this.
You’ve found a pretty high class way around the problem! 
Tom
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Main System:
Amati Futura Mains
Amati Homage VOX Center,
Proac Response 1sc Rears,
Three MC2301's for L,C,R
MC 602 for the rears
C 1100, MX 151, MCD 1100, MR 80
Nottingham Dais with Wave Mechanic
Sumiko Palo Santos Presentation
SurfacePro 3, RPi 4, ROON, WW Starlight Platinum USB, Schiit Yggdrasil, Benchmark DAC3 HGC
MX 151, OppO BDP-95, JVC RS-500 DILA projector, 106" diagonal Stewart Luxus Screenwall Deluxe with Studiotek 130 G3 material.
Lake House:
Ohm F, MC 275V, C2300, MR 77, Rega P3
OnDeck:
McIntosh MAC 4300v
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