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Herbie's Audio Lab has
auditioned more than 300 different ball materials for use
with Iso-Cups. Each
material renders unique sonic qualities, affecting
frequency response linearity and dynamics. Most materials, including very hard exotic metals and ceramics,
affect a characteristic "twinge" or other
coloration to the music. Very few materials are sonically friendly to home audio. We have fine-tweaked our Iso-Cup formulations specifically to synergistically complement the most affordable of the most sonically neutral materials.
Every audio
system is different though. From one system to another, a
particular Iso-Cup/ball combination or another might
achieve an even more preferable result. The following
materials
are particularly effective. Differences between one kind
of ball and another are 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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