ReL Subs: High Level or Low Level connection

I run pairs of RELs in 4 out of my 6 systems. All connected via high level. Some with the upgraded bassline blue cables, others with the stock speakon cables.

I also run RCA’s for LFE to a pair of S510’s in my home theatre. I agree with other commenters above that it is worth a shot to try it both ways and see which you like better.

mijostyn   Your's was an informative ah-ha post for me.

Hacks that we are, despite the systems star grounding we assumed a grounding issue but were very hesitant to lift the amplifier ground.

The three of us could hear a noticeable issue when those high level cables were connected to the JC-1 amplifiers that were powering the system. It wasn't a huge issue but once we identified it became one of those things you couldn't help but hear.  

Mijostyn

Thank you for all that info.

Some a bit over my head.

Does what you say apply to SUBS with an amp in them ?

For instance my Rel S/510's?

Or just to passive subs?

Thank you

@oddiofyle

I like to run my mains full range, never with any type of high pass going to my Amp.  With a low crossover the REL will never call attention to itself. 

Does that mean you are running 'low level"'?

No, running mains full range and driving sub via speakon cn.   I have a Velodyne SMS 1 that I used to use with the REL but I took it out and went speaker level off the same binding posts as speakers.   I ran that RCA and single cable out of that to sub.   I set the crossover low, at around 40 Hz.  Never calls attention to itself 

The 40 step  X - over knob on a REL  that is marked 25 Hz to 100 Hz is about 1.8 dB per step.