ralphpnj wrote: > I'm a bit lost here, could you please put the db/w/m measurement in > context? > > Your comment about using equalization to overcome physical laws makes me > think of smartphone, tablet, laptop and many bluetooth speakers which > use DSP, like the Devialet, to make their tiny speakers sound halfway > decent.
> Your comment about using equalization to overcome physical laws makes me > think of smartphone, tablet, laptop and many bluetooth speakers which > use DSP, like the Devialet, to make their tiny speakers sound halfway > decent. I don't think I've ever heard any of the above sound "halfway decent" With the specs, Where to start ! The specs they have produced are odd, contradictory and point to the problem. "Uncover the richness of songs you have heard a thousand times in all their amplitude, from sub bass at 16hz to ultra sharp sound at 25kHz with no background noise, no saturation, no distortion, all that up to 3000 Watts and 105 Decibels of power." "no background noise, no saturation, no distortion" thats the rules of physics out of the window for a start ! They then state "ADH amplification Distortion: 0.001% | Saturation : 0 | Background Noise : < 0,5dB SPL at 3m " so contradicting their first statement I'm dubious about "Background Noise : < 0,5dB SPL at 3m" cant be bothered to do the calc but this would mean an incredibly quiet signal path No saturation, this means no limit to speaker excursion or amplifier power, again this can be faked by automatic gain control but who really wants a frequency and amplitude dependent compression in their speakers ? With particular respect to LF output All speakers produce distortion and saturate dsp (or any other eq) cannot correct for distortion if the drivers have run out of excursion if the cone is on its end stop no more compensation can work. "16Hz to 25kHz ± 2dB at 82dB SPL" this says the LF speaker only has enough excursion to produce 82db @ 16hz The specs at higher spl's and the fact that the LF units will be hitting the end stops mean that the bandwidth must be reduced at higher spl's In fact an exploration of the white paper reveals this as "the drive unit model" and "acoustic level tracking" oh and of course "The magic wire " !! There's far to much in the data that the engineer would raise and eyebrow to "A new engineering that outperfoms all existing systems" is my favourite, what is OUTPERFOMS ? :) As to context of 80db/w/m my speakers are 93 db/w/m 49hz-20khz ie nearly 20 times more efficient (and speakers are really inefficient to start with (especially hifi ones) ) I'd really like to see an audio distortion plot at various spl's I seem to be turning this into a rant so I will stop, but this sort of fluffery annoys me In reality they may sound OK but an active speaker done right ? No *Players:* SliMP3,Squeezebox3 x3,Receiver,SqueezePlayer,PiCorePlayer x3,Wandboard *Server:* LMS Version: 7.9.0 - 1453293926 on Centos 7 VM on ESXi 6 on HP N54L *Plugins:* AutoRescan/BBCiPlayer/PowerSave/PowerSwitchIII/Squeezecloud *Remotes:* iPeng8/Orangesqueeze/PC/Jivelite *Music:* 383GB,1269 albums 17756 songs 4381 artists mostly FLACs *Want a webapp ?* See http://forums.slimdevices.com/showthread.php?104305-Webapp-for-LMS ------------------------------------------------------------------------ Jeff07971's Profile: http://forums.slimdevices.com/member.php?userid=49290 View this thread: http://forums.slimdevices.com/showthread.php?t=105563
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