I liked my bi-amped Sonos IKEA Symfonisk pair of vintage Klipsch KG4 speakers so much I decided to upgrade the cabinets with damping and a brace, sand and refinish the wood veneer cabinets, paint the front and back, and add a pair of 5 way binding posts. They sound incredible now. Noico 80 mil 10 sqft car Sound deadening mat, Butyl Automotive Sound Deadener, Audio Noise Insulation and dampening https://amzn.to/3FRJkoa Neoprene Foam Tape with 3" Core, 1/16" x 1/2" x 100', Black https://amzn.to/3BXsdAh Woodcrafter 3/4" Thick Baltic Birch Plywood Circle 6 Inch https://amzn.to/3BVgrqb GearIT 12AWG Premium Heavy Duty Braided Speaker Wire (6 Feet) with Dual Gold Plated Banana Plug Tips - Oxygen-Free Copper (OFC) Construction, White https://amzn.to/3BUYDeU Gold Plated Binding Post Banana Jacks Connectors Extra Long Shaft with Solder Tabs (4-Pair) https://amzn.to/3WClAv7 KabelDirekt - Pure Copper Stereo Audio Speaker Wire & Cable - Made in Germany - 14 AWG Gauge - 50 feet https://amzn.to/3hGlYKt Rust-Oleum 327916 American Accents Spray Paint, 12 oz, Satin Canyon Black https://amzn.to/3vc0dW4