Honestly, I think the cheapest tweak is to buy a better whatever component you're trying to tweak. Between the power cords, shelves, cones, blocks and other bullshit, you end up spending more than a better "whatever" in the long run. That aside, I really thought the Audience single-outlet power conditioner (ARp1?) made a really positive improvement in my system. About $300 and change used. I guess this is "cheap" in the world of high-end. I plugged it directly into the outlet and attached a $50 Wiremold strip to it.