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Junior Varsity
Crest Pro-Lite Questions - Two 3.0 bridged or one 7.5 for a pair of Danley TH118?
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<blockquote data-quote="Alan Sledzieski" data-source="post: 132944" data-attributes="member: 1022"><p>Re: Crest Pro-Lite Questions - Two 3.0 bridged or one 7.5 for a pair of Danley TH118</p><p></p><p><a href="http://www.diy.poweraudio.ro/albums/userpics/10001/BENCH_COMPARISON_TEST.pdf" target="_blank">http://www.diy.poweraudio.ro/albums/userpics/10001/BENCH_COMPARISON_TEST.pdf</a></p><p></p><p>Stuff like this,</p><p></p><p>As shown, the fP6400 suffers when trying to follow the</p><p>envelope of the input signal. The distortion value grows</p><p>with the output power. During long-duration use, the</p><p>limitations of the power supply in this amplifier will be</p><p>evident. Their fold-back limiter will turn on and drastically</p><p>reduce the signal.</p><p></p><p>Before clipping, the fP behavior is relatively linear.</p><p>Again, it is very clear to see the limitation of the</p><p>power supply in long duration performances, with a</p><p>typical fall-back limiter drastically reducing the output</p><p>power.</p><p></p><p>Looking at the fP chart you can see that, starting</p><p>from the second cycle, the energy is slightly cut.</p><p>After that it remains more or less at the same level.</p><p>The performance of the IT is good, both for the peak</p><p>level and for the holding time.</p><p>For this specific test and, thanks to its very high rail</p><p>bus voltage, the IT</p><p>performs the best. The K10’s measurements are</p><p>very close in comparison to the IT.</p><p>Take note that the K6 shows a perfect waveform (ie:</p><p>not at all limited) thanks to it’s over sized power</p><p>supply</p><p></p><p>The IT requires 10000W from the mains to provide 7000W of Total Output</p><p>Power while the K Series consumes 8000W to provide 7000W of Total</p><p>Output Power.</p><p></p><p>Power Loss Vs. Continuous Total Output Power</p><p>In the fourth chart, power dissipation is shown using BTU/h</p><p>(British Thermal Unit per hour) as units of heat.</p><p>Looking at the chart, you can see that in order to produce 7000W of</p><p>audio</p><p>power, the IT dissipates 10000 BTU, while the K Series uses only 4000</p><p>BTU (less than half). In other words, with the same amount of heat</p><p>dissipation, you can use more than double the amount of K Series</p><p>amplifiers verses ITs and you get more than double the amount of audio</p><p>power.</p><p>You will notice that, with the same heat dissipation, the fP is providing</p><p>3200W of power verses 7000W from the K Series.</p><p>In conclusion, we can certainly say that fP and IT amplifiers are much</p><p>more expensive to run verses the K Series in terms of power consumption</p><p>and air conditioning requirements.</p><p>These measurements have been performed at 230V. The K Series</p><p>amplifiers’ performance will remain more or less the same (less than 1%</p><p>lower) at 120V mains.</p><p>22</p><p></p><p>Power Vs Time With Both Channels Driven</p><p>These charts show the output power of the amps Vs.</p><p>time at 8-Ohms, 4-Ohms, and 2-Ohms.</p><p>At 8-Ohms, the fP produces a maximum output power</p><p>that holds for a few seconds before the power drops. At</p><p>4-Ohms after 0.1s, it is visible that the output power</p><p>drops due to the power supply’s performance. The</p><p>power continues to drop until around 1 second where it</p><p>holds steady for about 100 seconds before dropping off</p><p>again. At that point, thermal factors begin to reduce the</p><p>output power.</p><p>At 2-Ohms the fP has a much higher peak power</p><p>however, the power supply suffers much sooner. After</p><p>about a second, the behavior is more or less the same</p><p>as it was with a 4-Ohm load</p><p>At 8-Ohms, the IT holds the maximum output power for</p><p>about 90 seconds. After that, a protection circuit</p><p>reduces the output level to roughly 1000W. Soon after,</p><p>thermal factors reduce the output power to 250-300W</p><p>only!</p><p>At 4-Ohms the IT performs well for over 1 second.</p><p>While at 2-Ohms the behavior shows a starting peak</p><p>power of 6000W which is then reduced to 4000 just</p><p>after 0.1s.</p><p>As you can see, the K Series’ performance has been</p><p>tuned to produce a very high peak power and hold it for</p><p>a long time, regardless of the load.</p></blockquote><p></p>
[QUOTE="Alan Sledzieski, post: 132944, member: 1022"] Re: Crest Pro-Lite Questions - Two 3.0 bridged or one 7.5 for a pair of Danley TH118 [url]http://www.diy.poweraudio.ro/albums/userpics/10001/BENCH_COMPARISON_TEST.pdf[/url] Stuff like this, As shown, the fP6400 suffers when trying to follow the envelope of the input signal. The distortion value grows with the output power. During long-duration use, the limitations of the power supply in this amplifier will be evident. Their fold-back limiter will turn on and drastically reduce the signal. Before clipping, the fP behavior is relatively linear. Again, it is very clear to see the limitation of the power supply in long duration performances, with a typical fall-back limiter drastically reducing the output power. Looking at the fP chart you can see that, starting from the second cycle, the energy is slightly cut. After that it remains more or less at the same level. The performance of the IT is good, both for the peak level and for the holding time. For this specific test and, thanks to its very high rail bus voltage, the IT performs the best. The K10’s measurements are very close in comparison to the IT. Take note that the K6 shows a perfect waveform (ie: not at all limited) thanks to it’s over sized power supply The IT requires 10000W from the mains to provide 7000W of Total Output Power while the K Series consumes 8000W to provide 7000W of Total Output Power. Power Loss Vs. Continuous Total Output Power In the fourth chart, power dissipation is shown using BTU/h (British Thermal Unit per hour) as units of heat. Looking at the chart, you can see that in order to produce 7000W of audio power, the IT dissipates 10000 BTU, while the K Series uses only 4000 BTU (less than half). In other words, with the same amount of heat dissipation, you can use more than double the amount of K Series amplifiers verses ITs and you get more than double the amount of audio power. You will notice that, with the same heat dissipation, the fP is providing 3200W of power verses 7000W from the K Series. In conclusion, we can certainly say that fP and IT amplifiers are much more expensive to run verses the K Series in terms of power consumption and air conditioning requirements. These measurements have been performed at 230V. The K Series amplifiers’ performance will remain more or less the same (less than 1% lower) at 120V mains. 22 Power Vs Time With Both Channels Driven These charts show the output power of the amps Vs. time at 8-Ohms, 4-Ohms, and 2-Ohms. At 8-Ohms, the fP produces a maximum output power that holds for a few seconds before the power drops. At 4-Ohms after 0.1s, it is visible that the output power drops due to the power supply’s performance. The power continues to drop until around 1 second where it holds steady for about 100 seconds before dropping off again. At that point, thermal factors begin to reduce the output power. At 2-Ohms the fP has a much higher peak power however, the power supply suffers much sooner. After about a second, the behavior is more or less the same as it was with a 4-Ohm load At 8-Ohms, the IT holds the maximum output power for about 90 seconds. After that, a protection circuit reduces the output level to roughly 1000W. Soon after, thermal factors reduce the output power to 250-300W only! At 4-Ohms the IT performs well for over 1 second. While at 2-Ohms the behavior shows a starting peak power of 6000W which is then reduced to 4000 just after 0.1s. As you can see, the K Series’ performance has been tuned to produce a very high peak power and hold it for a long time, regardless of the load. [/QUOTE]
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Crest Pro-Lite Questions - Two 3.0 bridged or one 7.5 for a pair of Danley TH118?
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