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All items written by Dennis Colin
Frequency Delay Dispersion
March 21, 2017 by Dennis Colin

Frequency Delay Dispersion

The phase nonlinearity of most second- and higher-order speaker crossovers is illustrated with the step response of cascaded all-pass networks. Audibility issues are discussed. The audibility threshold depends on many factors; reports vary from about 100μS to 2mS. A sufficient amount, though, is certainly audible. This article was originally published in audioXpress, November 2007.
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A 6-Channel Volume/Balance Control
December 19, 2016 by Dennis Colin

A 6-Channel Volume/Balance Control

This versatile control circuit is pure Class A analog, allowing control over the ultra-high transparency SACD (Direct Stream Digital) or DVD-A multichannel surround formats with up to six power amp channels. As the author wrote when he experienced multichannel music in SACD, “With a good recording, this transparent naturalness extends to an enveloping soundfield that - at its best - can make you think you’ve been listening from just outside the concert hall doorway, and now you’ve walked inside!”
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