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Old 13th July 2018, 04:53 PM   #4291
tomchr is offline tomchr  Canada
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It's a common feature on the various amplifier modules intended for OEM use. ICEpower, Hypex, Pascal, et al. all have clip/overload detectors.

Tom
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Old 13th July 2018, 05:55 PM   #4292
BrianL is offline BrianL  United States
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True, though Crown or whomever advertised it as a linearity indicator rather than a clip indicator.
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Old 13th July 2018, 07:50 PM   #4293
tomchr is offline tomchr  Canada
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Put an inverter on the CLIP output and you have a LINEAR indicator...

Somehow I'm not surprised that someone used clever marketing to highlight that their box had a CLIP indicator. That sounds like something out of the late 1970ies or 1980ies.

Tom
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Old 13th July 2018, 08:00 PM   #4294
tomchr is offline tomchr  Canada
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Dang! I love when we're both right. From Ben Duncan, "High Performance Audio Power Amplifiers": "Crown's patented IOC (Input-Output Comparator) scheme first appeared in 1977 on their DC300A-II. In this and the subsequent related schemes used by other makers, the input and output are compared with the transfer function subtracted. If input differs substantially from the output (less the normal gain and phase differences), the amplifier must be clipping, shorted, slew limiting or otherwise sick, due to RF oscillation or a 'DC fault'. If so a (sic) LED marked 'IOC' or 'Clip' or 'Error' lights."

Tom
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Modulus-686: 240W/8Ω @ <0.00025% THD. Modulus-86: 40W/8Ω @ 0.000054% THD. DG300B & Other Tube Circuits.
Neurochrome : : Audio - www.neurochrome.com - Engineering : : Done : : Right
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Old 13th July 2018, 08:06 PM   #4295
tomchr is offline tomchr  Canada
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More from Samsung-owned Harman Kardon-owned Crown: https://www.google.com/url?sa=t&rct=...67JZLMKlSdumVe

In case the link doesn't work, I've attached the linked .pdf here.

Tom
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File Type: pdf iocpaper_original.pdf (30.1 KB, 19 views)
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Old 13th July 2018, 10:34 PM   #4296
BrianL is offline BrianL  United States
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Interesting that in their own literature they'd refer to one of their most famous products as "300 Watts and a Cloud of Smoke".

Surely a lot of hype for a relatively simple function. The trick is to incorporate into your amps, which have less distortion by several orders of magnitude, and not mess up distortion and/or stability. I expect it can be done without too much trouble.
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