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Optional Iso-Cup Balls:

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Herbie's Audio Lab has auditioned more than 300 different ball materials for use with Iso-Cups and fine-tweaked the Iso-Cup formulation to synergize optimally with the very best materials. Each material renders unique sonic qualities, affecting frequency response linearity and dynamics. Most materials affect a characteristic "twinge" or other coloration to the music. A rare few lack any particular coloration, though each affects dynamic impact in its own unique way. We have found that nothing works better, overall, than a lampblack/soda-lime glass ball, which is our default Iso-Cup ball recommendation (featured here).

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Every audio system is different, however, each with its own array of interdependent variables. From one system to another, a particular Iso-Cup/ball combination or another might achieve an even more preferable result. The following materials each achieve full-range frequency response and are particularly effective. Differences between one kind of sphere and another are quite subtle, falling within a range of personal preference and system synergies. Sonic differences are equivalent to differences encountered with "tube rolling" among different brands/types of vacuum tubes. Each of the following balls, however, performs very well with virtually any audio or audio/video system: 

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Iso-Cup w/Gabon ebony ball Gabon Ebony: African ebony subtly enhances upper frequency timbre with ethereal sustain and "bloom." Though bass is not particularly powerful, extension is very deep and well-defined. Upper-mids are smooth with plenty of "air" and three-dimensionality. Gabon ebony is perfect for music lovers who enjoy a somewhat laid-back, light and natural presentation. Peen-hardened 1" ball only, $8.49.ea.
Iso-Cup w/Picasso Jasper Ball Picasso Jasper: This gemstone is perfect for audio systems that are a little too bright and harsh. Delivers smooth yet articulate highs, dynamic midrange, rock-solid bottom. 1" ball only, $4.49.ea.
Iso-Cup w/quartz ball Deep Moss Quartz: This gemstone is extremely faithful to tonal character. Although not super-fast, it has adequate microdynamic speed to present all the musical energy and nuance of a live performance. With a powerful and well-rounded bottom end, it's ideal for any system not overly bright but perhaps a bit "thin" at the bottom. 1" ball only, $4.49.ea.
Iso-Cup w/Picture Jasper Ball Picture Jasper: By delivering a sharply-defined and uncluttered mid/lower midrange, this gemstone tends to open up, lighten up, and improve systems that are a bit "dark" or sullen. Deeply extended, linear bass. Beautiful tone/timbre. 1" ball only, $4.49.ea.
Iso-Cup w/Mexican Agate Mexican Agate: This conglomerate gemstone extends and subtly enhances bass deep in the subwoof region, particularly with systems driving 3-way loudspeakers. Bass response seems slightly fuller with a little more "oomph" behind it. Maintains faithful linearity and speed from mid-bottom to the highest frequencies; with well-controlled timbre; big, spacious soundstage. 1" ball only, $6.49.ea.

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Iso-Cup only: Holds any of the above balls. Soft, platinum-cured silicone reduces glare, fuzz, sibilance, caused by micro-vibrations. Isolates and decouples component from shelf or platform. $18.95.ea. (6 or more: $17.19 ea.)

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