Thanks for your previous input and recommendations. I'm on a roll, so I'm going to keep going with the balance of questions so I can place an order.
I have 3 more pieces to ask recommendations for;
1) Anthem 5 channel HT amp - basic chassis of steel / sheetmetal with two large transformers behind front faceplate. I assume the weight bias is 70/30 toward the front of chassis. It weighs 60 pounds and has 4 generic oem dense rubber feet. I'm wondering if Big Tall Tenderfoot Extra-firm or Iso-Cups with SuperSonic hardballs?
2) SimAudio W-7 solid state amp. It has a rigid chassis with aluminum pillars at each corner with small (3/4 inch high) screw in pointed cones. It weighs 85 pounds. I was originally thinking just get the Hush Puckies to put under the oem points, then after reading more about the Iso-Cups, it occured to me why not unscrew the small points and place an Iso-Cup and Ball directly under the threaded opening for the pointed cone? The ball could kind of rest in that threaded opening.
3) SimAudio P-7 preamp. Same basic chassis design as the amp, with pointed cones at each corner. It weighs 40 pounds. Same suspension question - Hush Puckies under the oem points, Iso-Cups or possibly Big Tall Tenderfeet?