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Junior Varsity
Crown Xti front panel messages
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<blockquote data-quote="Tim Duffin" data-source="post: 83680" data-attributes="member: 400"><p>Re: Crown Xti front panel messages</p><p></p><p></p><p></p><p>It is not a theory, and yes. I do. I tested 4 of my 12 xti4000 amps by loading fw1.000 (factory firmware from the very first hardware revision of amplifiers) and saved that fw file on my computer. Then, I got out my fluke 199c 003s meter which was calibrated by fluke at the time and measured the output voltage of the amplifier using the internal pink noise generator with the amplifier connected to a 2ohm purely resistive dummy load in stereo. So, one channel driven at 2 ohms at maximum output from the internal pink noise generator and I measured the voltage. then, I took the same amp and loaded a later version of firmware 1.4 and repeated the measurement, then loaded the most recent firmware and repeated the measurement. The results did not surprise me. For every firmware update, the amplifier "loses" 6% of its total max output voltage into a 2 ohm load. When I stopped updating firmware, the same xti4000 went from 1988watts per channel into a 2 ohm load to 1426 into a 2 ohm load. The interesting thing about this experiment i did (way back when I thought the xti was a good amp) was that one could blow the circuit breaker in the amp by doing my experiment with the factory firmware, with subsequent firmware updates, it was impossible to blow the breaker. This whole experiment was repeated with 4 xti4000 amps manufactured on different dates with the exact same results. I called crown on it, but they simply replied that "xti amplifiers remained within specifications regardless of firmware revision." You decide for yourself what that means. Shortly thereafter, I sold all my xti amps.</p><p> </p><p>For anyone who is interested, I actually still have my purely resistive 2000w dummy load--which was the most impossible thing to find I have ever looked for.</p></blockquote><p></p>
[QUOTE="Tim Duffin, post: 83680, member: 400"] Re: Crown Xti front panel messages It is not a theory, and yes. I do. I tested 4 of my 12 xti4000 amps by loading fw1.000 (factory firmware from the very first hardware revision of amplifiers) and saved that fw file on my computer. Then, I got out my fluke 199c 003s meter which was calibrated by fluke at the time and measured the output voltage of the amplifier using the internal pink noise generator with the amplifier connected to a 2ohm purely resistive dummy load in stereo. So, one channel driven at 2 ohms at maximum output from the internal pink noise generator and I measured the voltage. then, I took the same amp and loaded a later version of firmware 1.4 and repeated the measurement, then loaded the most recent firmware and repeated the measurement. The results did not surprise me. For every firmware update, the amplifier "loses" 6% of its total max output voltage into a 2 ohm load. When I stopped updating firmware, the same xti4000 went from 1988watts per channel into a 2 ohm load to 1426 into a 2 ohm load. The interesting thing about this experiment i did (way back when I thought the xti was a good amp) was that one could blow the circuit breaker in the amp by doing my experiment with the factory firmware, with subsequent firmware updates, it was impossible to blow the breaker. This whole experiment was repeated with 4 xti4000 amps manufactured on different dates with the exact same results. I called crown on it, but they simply replied that "xti amplifiers remained within specifications regardless of firmware revision." You decide for yourself what that means. Shortly thereafter, I sold all my xti amps. For anyone who is interested, I actually still have my purely resistive 2000w dummy load--which was the most impossible thing to find I have ever looked for. [/QUOTE]
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