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<blockquote data-quote="Bob Lee" data-source="post: 123376" data-attributes="member: 4707">Re: Clip limiting: qsc ex4000 vs qsc Rmx 5050The EX4000 clip limiter is a little primitive, being based on an optocoupler shunt in the input stage with the LED being driven from the same line that lights up the front panel clip LED.The RMX5050 clip limiter is based on an OTA in the negative feedback loop of the input op amp. The OTA acts like a variable resistance: normally very high, but decreasing when IABC from the loss-of-feedback detection circuitry increases. The attack and release are are little slower.Regarding clipping and distortion: any clipping is distortion. A clip limiter does not prevent clipping but will reduce audible distortion when clipping occurs. If you rely too heavily on clip limiting to make up for inadequate headroom, you&#039;re liable to inhibit dynamics by squashing the peaks. Very brief and infrequent clips tend to be inaudible. And keep in mind that some amps&#039; clip LEDs are very sensitive to brightly indicating even the shortest and most insignificant little bits of clipping, and well, some aren&#039;t. :?~:-?~:???:</blockquote>

[QUOTE="Bob Lee, post: 123376, member: 4707"] Re: Clip limiting: qsc ex4000 vs qsc Rmx 5050 The EX4000 clip limiter is a little primitive, being based on an optocoupler shunt in the input stage with the LED being driven from the same line that lights up the front panel clip LED. The RMX5050 clip limiter is based on an OTA in the negative feedback loop of the input op amp. The OTA acts like a variable resistance: normally very high, but decreasing when I[SIZE=1]ABC[/SIZE] from the loss-of-feedback detection circuitry increases. The attack and release are are little slower. Regarding clipping and distortion: any clipping is distortion. A clip limiter does not prevent clipping but will reduce audible distortion when clipping occurs. If you rely too heavily on clip limiting to make up for inadequate headroom, you're liable to inhibit dynamics by squashing the peaks. Very brief and infrequent clips tend to be inaudible. And keep in mind that some amps' clip LEDs are very sensitive to brightly indicating even the shortest and most insignificant little bits of clipping, and well, some aren't. :?~:-?~:???: [/QUOTE]

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