New to Turntables

@chakster

I suppose I could strip out an individual conductor, but I am not sure if spray foam Polyethylene is a sufficient shield against interference from other cables.

My understanding with ground wires, is that it offloads excess electrical signal from the main audio signal. Is this correct or am I over simplifying it?

My thought is using the geometry and multiple conductors in the Type-4 cable to offload that electrical signal faster than a 24 gauge multi-strand cable.

Turntable grounding is somewhat unique, and should go to that labeled screw at your phono input on the Yamaha. It doesn't have a thing to do with anything else.

@builder3  

Yes, but the option exists for two different connecting methods:

Option 1: Turn off Denon's built-in pre-amp. Connect RCA to RCA to Yamaha's Phono section. Connect GND from Denon player to GND on Yamaha.

Option 2: Turn on Denon's built-in pre-amp.  Connect RCA to RCA to the Yamaha on any available section.

I sort of get this feeling, after reading the Denon's manual online that the built in pre-amp is sort of a last resort method and that they prefer you connect to an external pre-amp.

Last resort? Yes, by and large. In your case though Yamaha, by and large means try and see. Same for ground. By and large just don't cut it. Good example, just got a new Origin Live Enterprise arm. Terrific arm. Hum in one channel. Hate hum, because you just never know where or what until you luck out and find it. In this case I decided to try and disconnect the ground. By and large that would yield horrible hum. In this case though I lucked out- hum eliminated. Why one channel not the other? Who knows? Why ungrounded dead quiet when it should be ruinously loud hum? Who cares? Not me!  

In your case for all we know the built in stage being built to eliminate such problems may well wind up being the better or at least more quiet way to go. Or not. Point being you can ask and ask and take polls and ask some more- and never ever know.  Until you try. 

I’d start with Option 1. Either way, the turntable is still designed to be grounded in the original manner, (I believe). Don’t reinvent the wheel unless it’s absolutely necessary.