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196.3.50.254
In Reply to: RE: It is apples and oranges! posted by KlausR. on February 05, 2008 at 02:29:11
"You are comparing THD to k2 and this at different frequencies!"
Klaus, you are really being silly here. They are showing the whole spectrum with K2 and K3 well below what your speaker achieves. The rest is negligible at below -70db. Also, the frequency of 18Hz is MUCH more difficult to do cleanly than 50Hz. MUCH. So if anything it makes your speaker come off even worse in the comparison as it is clear by 18Hz your speaker will have abotu 100% distortion and the only thing we would hear are K2 and K3 (ie. 36 and 54Hz).
Besides they also show the data for higher frequencies.
For example at 100Hz:
"Over the 86dB-96dB range and up to the highest 106dB loudness, the X-1's third harmonic remained unchanged at around 0.1% (-60dB). Not unexpectedly, the second harmonic progressively lost ground as the spl increased, but this was to a still-state-of-the-art 0.2% (-54dB) at the highest test level (fig.3). "
At 1Khz:
"With a 1kHz tone at 96dB, there was a mild increase in third-harmonic distortion to -50dB, with the second still better than -65dB. Moving into the treble range, to 5kHz, the upper 96dB test level resulted in a truly negligible amount of second harmonic (-66dB, 0.05%), and everything else was down at -70dB or better—another great result (fig.4). "
At 24Hz:
"At 106dB, the X-1 was still kicking hard, the second harmonic of the 24Hz tone lying at -32dB, the third at -27dB. Many big speakers have low-frequency distortion more than 40dB higher at this point; in other words, the distortion power is greater than the fundamental—a phenomenon called "doubling." "
That doubling is what your speakers would be doing at 24Hz, Klaus.
At 18Hz:
"By this time I was fully confident of the X-1's abilities, so drove it with an infrasonic 18Hz fundamental at a nominal 106dB sound-pressure level (fig.5), the latter referenced to the level at 24Hz. I found that genuine high-power output was possible into the ultra-low bass. Even with the punishing 18Hz signal, the second harmonic was quite inaudible at -40dB (1%), with the third very low at -47dB (0.4%)—a quite remarkable performance. Well, the experts always told us that for good bass you needed a big box and big cones; you certainly get them with the X-1!
"
Like I said, your speaker can't touch this.
"Where were the Wilson measured? Anechoic or in Colloms' room, where SPL decreases 2-3 dB when distance doubles. If it is in Colloms's room, again, you can't compare because for the same SPL the loudspeaker has to work less hard.
"
Give me a break Klaus, you are splitting the hairs so fine as to be ridiculous. If you like then the 100db from K&H is quite close to the 106db from Wilson review and your speaker STILL loses by a mile (or kilometer if you prefer).
"The Wilson's side panel is about 1.7 times larger"
And probably 10 times as stiff.
"This excellence extended to the vibration performance of the Grand SLAMM's enclosure. I probed several locations on the three upper-range modules and the bass enclosure with my low-mass B&K accelerometer, but it proved very hard to find anything of significance. The worst part of the largest panel of one of the midrange modules still had a desirably smooth output.
Very little vibrational energy emanated from the bass enclosure over its nominal 20-500Hz working band (fig.16). There was some vibrational output above 900Hz, but this was merely a low-level signal derived from the point contact with the stack of upper modules.—
"
Cabinet vibration from the bass is between -35 to -42db down from the frequency sweep level. This is SOTA just look at the graph, Klaus or did you miss that one?
"Unless you measure the amount of acoustic radiation by the panels you can't know. The drivers in O500C are sealed at the rear, so bass frequencies have no effect.
"
The measurements in the review, Klaus. I don't know what you mean by the statement of the woofers being sealed means. It is a vented speaker system is it not?
"There are no off-axis measurements for the Wilson"
Not true again, Klaus. An in-room measurement is the sum of the on-axis plus ALL the off-axis response. So it is included in that measurement.
Plus: "Fig.8 Wilson X-1/Grand SLAMM, horizontal (top) and vertical (bottom) response families at 45", normalized to response on tweeter axis. Dotted curves are -7.5 degrees vertical and 15 degrees horizontal; dashed curves are ±15 degrees vertical and 30 degrees, 45 degrees, and 60 degrees horizontal. "
What do you call this?
"Impulse response and waterfall are less good than for the O500C"
Well the impulse response is incomplete for the Wilson but what there is isn't bad at all. Yours achieves good impulse response strictly from DSP. THIS is apples to oranges Klaus!
As to the spectral decay, the Wilson has decayed below -20db in about 1.3 ms. The K&H about the same. I see no decisive advantage for your speaker there.
"You seem to be sure that a system selected on the basis of measurements alone must sound bad"
Heard enough of them to know that it isn't all about measurements and if you bought without listening first then well...
"Be assured, it sounds as it is supposed to sound, crystal clear, neutral, controlled"
I have heard enough so called "crystal" so called "clear" so called "neutral" (yes I know the German audiophile idea of neutral and believe me its not) and so called "controlled" to know that most of the time it is unnatural, lacking harmonic content, flat soundstage, overdamped etc. etc. Maybe yours is not but my experience tells me otherwise.
Nevermind though because the whole point of this part of this thread was to debunk your comment about high end loudspeakers not being accurate and I have now presented TWO speakers (the X1 and the Summa), which are measurably quite accurate. Whether or not they are MORE accurate than yours is academic because they both give excellent objective measurements even by your DSP "fixed" speakers standards. Thus your claim of inaccuracy has been debunked.
Hip, hip, hooray, bravo, what an achievement!!! Only, I can’t find that passage in MY book!
Meaningless comparisons are not my piece of cake, so I'm ending the discussion here and now.
Klaus
As long as you stop spreading misconceptions, Klaus, then I have achieved my goal with this debate.
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