On 3/27/14 4:10 PM, Tom Van Baak wrote:
Recently I happened across an eBay listing for an Antelope Audio
Isochrome, a device that apparently packages an SRI-PRS10 rubidium
oscillator and distribution amplifier in a box and sells to
audiophiles for a price in the
True, the PRS10 is a better choice than other cheap telecom
rubidium's but none of these comes close to the performance of a
premium OCXO. For the ultimate audio reference clock you want to
avoid Rb, or GPSDO, or Cs for that matter. Instead pick a 1e-12 or
1e-13 stable OCXO, strap it to a 100 pound block of granite, and
leave it alone.
A precision machined, finely crafted 100 pound block of granite (which
isn't all that big.. 1/3 cubic foot or so?) selected from the most
acoustically perfect granite by trained audiogranite craftsmen. The
relative ratios of feldspar, hornblende and quartz are chosen for each
installation according to the type of music and the vital harmonics of
the listener. If two different people will be listening (obviously not
at the same time, because only one can be at the perfect point between
the loudspeakers), you need a mixture of granites.
More seriously, I'm assuming you're advocating rock for the thermal mass
and/or mechanical. What about a 100 pound box of sand?
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