Speaker side. More details:

- At the bottom left of this photo you see a small connector for the TV's four speaker wires.

- Using some spare parts, I fashioned a plug that connected to that connector and had four speaker wire outs which run outside the TV. (TV's speakers are now disconnected.)

- Outside the TV, the four speaker wires connect to the speaker input terminals on this Russound ADP 1.2 device.

- If you look at the photos of the Russound device, you can clearly see its simple traces, and can see that it's a simple voltage divider, but the left and right channels assume a common ground.

Using it in that configuration didn't produce satisfactory results, so I scraped off parts of the ground trace, making it be two independent left and right channels with no ground connection between them. That, plus changing the resistors to 10k ohm and 47 ohm, seemed to get me the results I wanted.

Since I did those two things at the same time, I'm not sure which of those two modifications was the more beneficial one.