Powersoft X4 real power |
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DjLeco
Young Croc Joined: 21 April 2009 Location: Bucharest Status: Offline Points: 817 |
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Back emf energy cannot be included into a perpetuum mobile amplifier. Switching amplifiers does not dissipate this energy as heat like conventional AB class amplifier does it. But that's it, the back emf energy, cannot feed back the amplifier to use as power supply, because developed reversed energy of voice coil, cannot be higher than absorbed energy to efectuate mechanical work of loudspeaker. Don't eat all doghnuts they "serve to us"... Physical theories cannot be exceeded as perpetuum mobile, especially on power amplifier section...
Edited by DjLeco - 19 June 2017 at 12:24pm |
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I'm A Stupid SMART Romanian...
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DjLeco
Young Croc Joined: 21 April 2009 Location: Bucharest Status: Offline Points: 817 |
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I'm A Stupid SMART Romanian...
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gen0me
Young Croc Joined: 20 February 2016 Location: UK Status: Offline Points: 999 |
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Thats efficiency of large group of huge horns(9*1000dm3) not concerning power compression. Sorry but the best tunes I know have sinus from the very beginning to the end. And dont you feel cheated when someone sold you 100W amp as 1kW? 20ms is hardly 1 cycle... Edited by gen0me - 18 June 2017 at 2:58pm |
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toastyghost
The 10,000 Points Club Joined: 09 January 2007 Location: Manchester Status: Offline Points: 10919 |
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It's quite easy to measure the voltage and current on the amp in real use you know - they provide nice meters for all of it. You can do the maths yourself.
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DjLeco
Young Croc Joined: 21 April 2009 Location: Bucharest Status: Offline Points: 817 |
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I saw in one test that I do to the K10, showing 67-70 volts Rms and 50 amps on 2 ohms resistive load.
70 volts on 2 ohms means a maximum of 35 Arms on that dummy load, presuming the resistor value is not degrading with temperature (positive coedicient as loudspeaker voicecoil thermal compression). The powersoft measured 50 amps... That amperage value of 50 amps rms matched to 100 volts rms on 2 ohms dummy load. So, who I must believe? Ohm's law or Powersoft "software"? That test wasn't even burst mode done.
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I'm A Stupid SMART Romanian...
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snowflake
Old Croc Joined: 29 December 2004 Location: Bristol Status: Offline Points: 3121 |
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power factor? |
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fatfreddiescat
Young Croc Joined: 15 October 2010 Location: N.E.Wales Status: Offline Points: 1082 |
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Would equal 1 with a resistive load. |
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U.Viktor
Young Croc Joined: 04 May 2010 Status: Offline Points: 716 |
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It is not new that Powersoft is cheating with real power figures. These large amplifiers are always stated by burst ratings, such 8:32 1KHz standard. For example the K10 can pretty close deliver their peaks with 8:32 1KHz test signal.
Continuous power levels , for example for 5 straight seconds are just a fraction of the peak ~35-40% of the peak in case of 4 Ohms load with the K10. However the X4 (and likely the X8 too, but we did not measure that) can not deliver its specs even with 1:32 1KHz signal as well as 8:32 1KHz burst would pull down the whole amp, since its power supply can not deliver the required average power. So the difference lies in the peak to average ratios, if you have requirement of very narrow duty cycle jobs the X4 could be OK but as soon as you start to push it will collapses and loose dynamics/headroom. The X4 is NOT the amp what I would put to front stage , even for mids (rock music usually..) |
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gen0me
Young Croc Joined: 20 February 2016 Location: UK Status: Offline Points: 999 |
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Why such expensive amp has cuts on psu? Would bigger psu make it sound worse? How is it related to the sound?
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Sabbelbacke
Registered User Joined: 02 February 2010 Location: Germany Status: Offline Points: 48 |
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It is cheaper to build
people buy it anyways Most people won´t notice -> it sells. Goal reached (from powersofts point of view) |
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toastyghost
The 10,000 Points Club Joined: 09 January 2007 Location: Manchester Status: Offline Points: 10919 |
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It takes 415v or more. Or anything in between. Seems a pretty poky PSU to me. Odd thing is, we have 14. They run all sorts. And they play plenty loud for all our jobs, which are not exactly 'vanilla' shows. Hell, one X4 ran 8 scoops in Berlin on multiple shows no hassle and outplayed the JTS monoblocks no questions. |
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Hvedstrup
Registered User Joined: 30 October 2009 Status: Offline Points: 413 |
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Yes, but numbers on paper tells another story so your real world experience counts for nothing. I own 2 x K6 that I use to runs both Turbo TSW-718's and Tannoy VS218DR's. I have AB'ed them with Lab FP6400, 5000vz, Ram Bux 3.4, Crest 9001, Diqam 7000 and none of the others play sub like the Powersoft K. Im getting a step up card this week to make one of them a K8 since the Tannoys needs more juice.
Edited by Hvedstrup - 21 June 2017 at 8:37am |
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