Used these for a few months and upgraded to Stillpoints Ultras 5s. $100 for set of four, price includes shipping and paypal.
Herbie's Iso-Cups are formulated to address vibration problems unique to audio amplifiers, such as transformer vibration, tube sensitivity, and proximity of microphonics-sensitive capacitors to chassis vibrations, to bring out more of the amplifiers' inherent dynamics. Although Iso-Cups are particularly effective with open-chassis tube amplifiers, they provide superb isolation and decoupling for other audio and video components also, both tube and solid-state.
Iso-Cups maintain a linear frequency response with full-bodied dynamics and texture, punctual bass, intricate highs, smooth dynamics with plenty of punch and detail. Isolates amplifier-borne vibrations from penetrating the audio rack to contaminate the sonic integrity of other components, and vice-versa.
Iso-Cup: Firm yet compliant silicone-based formulation holds 1" ball firmly in place; ball will not roll.
SuperSonic Hardball: Compressed composite of metallic powders, carbon microfibers and polymers, this proprietary 1" ball is formulated to achieve the most sonically neutral and linear results possible. With no discernible coloration or "character," SuperSonic Hardball, together with Iso-Cup base, is sonically more natural and lifelike than any of the hundreds of materials we've tested, including exotic ceramics and metal alloys, gemstones, polymers, high-performance plastics, and hardwoods. Provides fast, punctual dynamics with unsurpassed musicality and tonal realism.
Recommended for amplifiers weighing from 20 to 300 pounds (9 kg to 136 kg). For amps weighing less than 20 pounds, use Tenderfoot isolation feet.
Dimensions: Iso-Cup and 1" ball: 1.5" wide by 1.4" tall.. (38.5mm x 35.6mm)
