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How to appropriately add sub to integrated amp + preamp setup?

Eruditarian

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Sep 28, 2021
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Hello All!

I recently got a setup with the SMSL VMV A2 integrated amp and KEF LS50 Metas. I have a MartinLogan Unison on the way to use as a preamp for the ARC as pure digital in-and-out to the VMV A2. I also have the KC62 sub on the way, and was having a hard time getting a good grasp on how to physically integrate the sub into the setup.

The VMV A2 has a single coax in/sub out, and the Unison has RCA L/R outputs. My questions are:
1. Does it make a difference if I use the A2 amp sub out, or the preamp RCA outputs to the sub? Would this change whether or not I use ARC? The manual for the Unison says something about using LFE if I want to use ARC, but I'm not sure if it makes a difference whether the connection is directly from the Unison or from a downstream amp.
2a. I'm not sure if I fully understand how to wire to the sub regardless :facepalm: ... if going from an Amp, is this saying I have the option of using a single Coax to RCA cable if I want to use LFE, or Coax to Y-split RCA if I don't do LFE?
2b. But, if I did the connection from the unison, it would be a Y-cable for the RCA L/R outputs to a single RCA for LFE input? o_O
1635826132776.png

Sorry if I'm overthinking this, and thank you for any guidance!
 

buzwork

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Sep 22, 2021
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I have my Unison optical output connected to Hegel H95 and the L/R analog outputs on the Unison connected to an SVS 3000 Micro.

I never use LFE for stereo listening.
 
OP
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Eruditarian

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Sep 28, 2021
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I have my Unison optical output connected to Hegel H95 and the L/R analog outputs on the Unison connected to an SVS 3000 Micro.

I never use LFE for stereo listening.
Hey thanks for the insight @buzwork on connecting the sub directly to the Unison in your setup! Do you use ARC on the Unison?

I was thinking we were supposed to use LFE for that based on their instructions:
1635891693058.png
 
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