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Powersoft K3, K20, M50Q (Part II)
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<blockquote data-quote="Langston Holland" data-source="post: 49311" data-attributes="member: 171"><p>Re: Powersoft Digam K3, K20, M50Q (Part 2e)</p><p></p><p>Hi Brian - I knew you'd be interested in this. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p></p><p></p><p>All maximum long term and short term power tests were into 4 ohms.</p><p></p><p></p><p></p><p>Into 4 ohms, yes.</p><p></p><p></p><p></p><p>Yes, but:</p><p></p><p>1. The short term test was 44.2779dBu or 4,021 watts into 4 ohms.</p><p></p><p>2. The amp's clip limiter was engaged during testing. It would have certainly shown more voltage swing with it off. The amp is rated at 5,200 watts per channel into 4 ohms or about 1dBu more than I measured.</p><p></p><p></p><p></p><p>A little more than 42dBu, but it outperformed every other amp in this testing and did so with an ease (fan speeds less than full) that made it obvious that it would have done very well into 2 ohms. This is the best LF amp I'm aware of.</p><p></p><p></p><p></p><p>Not exactly of course, some voltage drop occurs but not much. The K20 is rated at 9,000 watts per channel into 2 ohms. With the clip limiters off, I wouldn't be surprised if it achieved that. Both the FP14000 and K20 seemed quite comfortable in both the short term and long term max tests into 4 ohms. It was obvious that both had quite a bit more cooling capacity remaining for full tilt 2 ohm operation. In contrast, the M50Q, IT8000 and PL380 fans seemed to be at full throttle during the 4 ohm long term testing.</p><p></p><p>One observation on the cooling design of the Powersoft vs. Lab Gruppen amps is that to achieve a given thermal transfer rate, the former takes a more active (fan based) solution, whereas the latter uses high quantities of thin copper fins (much higher heat transfer than aluminum) in a more passive approach. Passive cooling has always been the more expensive path but generally allows quieter operation for a given efficiency. Powersoft has wisely chosen squirrel cage type fans that can achieve very high air flow with reduced fan tip speeds (tip speed is proportional to noise output). I noticed that the Powersoft fans are very carefully regulated as well, they immediately adjust for the load involved - very little lag time. I'd guess that it senses the current the amp is delivering, thus anticipating heating instead of simply reacting to it.</p></blockquote><p></p>
[QUOTE="Langston Holland, post: 49311, member: 171"] Re: Powersoft Digam K3, K20, M50Q (Part 2e) Hi Brian - I knew you'd be interested in this. :) All maximum long term and short term power tests were into 4 ohms. Into 4 ohms, yes. Yes, but: 1. The short term test was 44.2779dBu or 4,021 watts into 4 ohms. 2. The amp's clip limiter was engaged during testing. It would have certainly shown more voltage swing with it off. The amp is rated at 5,200 watts per channel into 4 ohms or about 1dBu more than I measured. A little more than 42dBu, but it outperformed every other amp in this testing and did so with an ease (fan speeds less than full) that made it obvious that it would have done very well into 2 ohms. This is the best LF amp I'm aware of. Not exactly of course, some voltage drop occurs but not much. The K20 is rated at 9,000 watts per channel into 2 ohms. With the clip limiters off, I wouldn't be surprised if it achieved that. Both the FP14000 and K20 seemed quite comfortable in both the short term and long term max tests into 4 ohms. It was obvious that both had quite a bit more cooling capacity remaining for full tilt 2 ohm operation. In contrast, the M50Q, IT8000 and PL380 fans seemed to be at full throttle during the 4 ohm long term testing. One observation on the cooling design of the Powersoft vs. Lab Gruppen amps is that to achieve a given thermal transfer rate, the former takes a more active (fan based) solution, whereas the latter uses high quantities of thin copper fins (much higher heat transfer than aluminum) in a more passive approach. Passive cooling has always been the more expensive path but generally allows quieter operation for a given efficiency. Powersoft has wisely chosen squirrel cage type fans that can achieve very high air flow with reduced fan tip speeds (tip speed is proportional to noise output). I noticed that the Powersoft fans are very carefully regulated as well, they immediately adjust for the load involved - very little lag time. I'd guess that it senses the current the amp is delivering, thus anticipating heating instead of simply reacting to it. [/QUOTE]
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