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In Reply to: RE: High end audio = musical accuracy, you must be kidding! posted by KlausR. on January 31, 2008 at 07:38:59
"geschalteten Versorgungsspannung"
Doesn't this mean Switched supply voltage?
"geringen Verlustleistung"
Doesn't this mean small energy dissipation? As in LOW bias??
Sounds like a switched mode power supply with a low bias Class B stage or Class D to me.
"This spec is averaged over the range 100 Hz - 6 kHz.
"
The spec is RUBBISH!! Look at the measurement, the speaker can only reach over 120db from 200Hz to 1Khz. Above 5Khz and below 100Hz it cannot even get to 110db.
"The S'phile measurements don't indicate at which distance it was measured, so I presume it was at 1 m. The measurements for the O500C were done at 2.1 m"
The point is the SPL level vs. distortion level. Its relative and distance is not really an issue so why bring it up? The change in level for both the distortion and the main signal will be the same with distance. Your speaker loses here big time.
" The figures in detail: given the fact that Wilson is measured at 96 dB/1m and mine at 100 dB/2.1m a meaningful comparison is not possible"
Look again Klaus, the numbers I gave you were for 106db! Yes they did 106db also in that review as I said read it again.
"Given the fact that the O500C do NOT deliver 20 Hz, let alone 18, no data are available for frequencies below 30 Hz."
Completely irrelevant! Given the high distortion at 30Hz or even 50Hz do you really think it will be better at 18Hz? For sure your speaker will try to reproduce 18Hz if you feed it 18Hz but it will probably ONLY make distortion. Probably you will get a LOT of 36Hz and 54Hz instead LOL!
"At 18 Hz and 106 dB/1m the Wilson produce -40 k2, mine at 60 Hz and 100 dB/2.1 m (which is roughly the same under anechoic conditions) produce - 48 k2.
"
BIG difference, Klaus, huge in fact. First it is MUCH lower in frequency (and the X1 is about -70db at your frequencies) and it is 6 db higher in level, also a big difference. Also, the measurements on K&H website show about -28 db not -48 db, learn to read a graph Klaus. Notice also that below 30Hz the distortion shoots off the top of the graph!! Now that's distortion (and not unusual for a vented design).
Clearly you should simply concede this point that your speaker is NOT at all lower in distortion than the X1 in bass or anywhere else for that matter.
"How much do the Wilson cost, $100K?"
It was about $85,000 not $100,000
"Further, how do these figure relate to thresholds of detection?"
Well clearly at 100db your speaker will be audibly distorting the bass and the X1 not. Simple as that.
"The graph on the linked page says, "anechoic response on tweeter axis at 45" (solid curve)" and the curve is flat ± 3.5 dB as compared to ± 1.5 dB for mine.
"
Look at the bottom graphs, Klaus. The ones that say in-room response. See them? Now look closely at the y-axis and you will see it is +-2.5db over the range I am talking about IN-ROOM. No one cares about the anechoic response and only on-axis. Meaningless specsmanship.
Even the quasi-anechoic measurements in Stereophile are averaged over a 30 degree window and so they too are not purely "on-axis" measurements but already somthing more useful. You should learn to read these things better Klaus.
"I'm not teaching you how to read such graphs. The central question is NOT wide or narrow dispersion, but how even/smooth the off-axis curves are"
No, I should be teaching you because of all the things you have either on purpose or on accident overlooked. Wide dispersion in a room IS an issue, mandating room treatment in most cases.
I have shown you that your speaker is not significantly superior in frequency response and inferior to a top of the line High end speaker in distortion (also in dynamic capabilities I am sure). So stop with the BS that high end speakers are all inaccurate!
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