REL and a few others recommend speaker level connections. The problem with this method is that(especially in HT setups) your mains then handle the entire frequency range. You have to handle any overlap between the mains and sub and there is no way to correctly time align the subs with the mains.
This works ok for 2 channel systems but falls short in HT applications.
The big advantage here is the easy hookup and it works with all but a few McIntosh amps.
An external crossover with variable time delay is the best technical approach. Most good HT pre-pros use this technique. Properly implemented the results can be stunning.
Some subs have an output for the mains - this is usually just a capacitor high pass filter and the results here will be very unpredictable and totally dependent on the impedance curve of your mains. Not recommended.
I prefer the technically correct time aligned method, but many people are very satisfied with the REL speaker level connection method.
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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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