Spectrascan 650 Manual

When I got to about 10 watts per channel, I noted that something strange was happening. Distortion, as read on my THD analyzer, was beginning to rise while I watched a steady-state signal at a fixed level! Examining the distortion components on the 'scope. I noticed, to my amazement, that "spikes" were showing up (and growing) at the points corresponding to the zero-axis crossings of the sinusoidal test signal. After a few seconds of this, I was convinced that there was some thing wrong with the amplifier, perhaps some sort of thermal runaway. Had I had a complete owner's manual and some of the literature which Spectrascan's president and chief designer, Jan C. Hoigaard, sent me later. I might not have jumped to that conclusion so quickly. I quote from that literature:

The following circuit information was condensed from the owner's manual supplied with the BPA-100B. There are essentially two important and novel de sign techniques used in this amplifier: Nested, multiple-loop feedback net works and an electronically regulated power supply. Using nested, multiple feedback loops makes it possible to employ poles and zeroes positioned so that open-loop phase shift remains less than 90 beyond the loop gain crossover frequency, even though overall gain roll-off may exceed 12 dB per octave. This would seem, at first, to fail the Bode criteria for stability, which state that each 6 dB of roll-off adds 90 of phase shift to the feedback loop's desired 180, that more than 90 (or 6 dB) leads to marginal stability, and that 180 (12 dB) turns the circuit into an oscillator. However, it can be shown that it is the relative roll-off closure rate between adjacent loops that deter mines stability and not the absolute roll-off rate. Expressed somewhat differently, each successive pole is can celled by a zero in the next nested loop, so the accumulated loop phase shift remains less than 90.

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In your guide you use a PR655 spectrascan that is directly supported by Psychopy for automatic calibration. If I use a device that is not supported (somehow manage to get a Spyder or similar give me luminance data), can I feed that in that data and have monitor center work with it instead? be457b7860