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Image: Herbie's Audio Lab Iso-Cup with 1" Aluminum Balls (shown with Lampblack Ball).
I find the essential sonic signature of a generic 1" solid aluminum ball placed in a Herbie's Audio Lab Iso-cup to fall somewhere midway between a Herbie's Audio Lab Frosted Acrylic Ball and a Herbie's Audio Lab Lampblack Ball. With my particular configuration (under a vibration control platform for an outboard PSU), the impression of the aluminum ball is a bit laid back like the Frosted Acrylic Ball but more assertive, not as aggressive as the Lampblack Ball, and essentially more analytical in nature than the Herbie's Audio Lab Gabon Ebony Ball. It would seem to be a happy medium, to my ear. That said, the Herbie's Audio Lab Iso-Cup with SuperSonic Hardball is still the best sounding option for a power amplifier application, IME.
1" solid aluminum balls sourced from SuperMagnetMan (see link):
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You might also try wooden balls. I bought mine from a craft store
You can also mix -1:2, 2:1
The specific energy transfer function of a ball material is crucial in how the non-compliant coupling action of the ball interacts with:
1. The bottom of a component it supports. A rigid enclosure panel/platform is vital in this regard.
2. The compliant decoupling of the Iso-Cup and shelf/platform. Again, a rigid platform surface is vital in this regard.
The ball and cup function as a coupling/decoupling "team". The nature of the design approach seems to be that of a compliant/non-compliant hybrid methodology. It's a layered approach rather than the brute force of one type of design or the other.
Lots of DIY experimentation possibilities...
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