I have a pair of JBL LSR305 I use as computer speakers and I'd say they are also outliers. Obviously they lack low end, and the lows sound boxy, but overall they sound better than any active speaker should for $99 each. The measurements are pretty good, too.
Well, the good news is that several of the top audio op-amps are very fast these days, in some cases much faster than AD797.
I'm not sure what player you tested but I'd expect the energy centered higher than 167 kHz for most new stuff, either way, I get your point.
Thanks Bonsai (what BBC knows about speaker building anyway?)
https://web.archive.org/web/20130619234645/http://www.kefamerica.com/july12/LS50 White Paper.pdf
George
Thanks for sharing that George - excellent write -up - I had not seen that
(Your link was unfortunately broken - here it is again)
https://www.kefdirect.com/pub/media/wysiwyg/documents/ls50/ls50_white_paper.pdf
Richard, I have never seen any studies looking at the effect ( if any) of HF harmonics folding down into the audio band - would be interesting.
How about two uncorrelated noise sources passed through a brick wall filter set to c. 22 kHz and then through an amplification chain as a test?
Also of interest is HF content on vinyl possibly.
How about two uncorrelated noise sources passed through a brick wall filter set to c. 22 kHz and then through an amplification chain as a test?
Also of interest is HF content on vinyl possibly.
I know of no others connecting the dots, as well.
This is worse issue than power line AF/HF/RF which also causes audible change in sound in many amps.
Awhile back D.Self did a test by injecting HF into PS and the THD DID increase on signal measured. This is like that and why some of the CD "sound" has been an elusive issue.
THx-RNMarsh
.
This is worse issue than power line AF/HF/RF which also causes audible change in sound in many amps.
Awhile back D.Self did a test by injecting HF into PS and the THD DID increase on signal measured. This is like that and why some of the CD "sound" has been an elusive issue.
THx-RNMarsh
.
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Depends on the power supply. LT3045 has around 60 dB of rejection at 1 MHz. Audio manufacturers also don’t seem to have discovered the giant portfolio of devices designed for post SMPS filtering and EMC. Doug Self uses old standbys like LM317 variants mostly in his books, so I’m not surprised.
How about one with THD that rises with power like this?
Attachments
Based on comments on this forum the LS50 is exceedingly polarising, which in itself is intriguing.
I read Jakobs comment completely differently from the way you did. language is a funny thing!
As HF harmonic distortion produces harmonics upper in the frequency range, which we are not supposed to can hear and that speakers will reject anyway because , usually, they do not produce any sound upper than 40KHz, don't you think it should be better to look at IM distortion in presence of HF components that can produce artifacts in the audible range ?
May i suggest that you read billshurv´s comment to the sentence that you´ve quoted?
Indeed it was about people listening (in person) to the same reproduction (same holds true for original sound events) at the same time and place.
Even in general your view isn´t correct; as i´ve already mentioned the difference between quantitative and qualitative research (and the merrits of these approaches), you might sometime try to get it. If you need some good literature just ask and i´ll cite some.
There was some old saying about horse, water and drinking ....
While your later points about out band stuff are of interest, may be something there - and relatively easy to measure so that's good!, we need to lose the THD meme. No one is categorising stuff by simple THD measurements, it's just one of a suite which show many things... Also - who is actually using CDs as a source these days? No one I know...
About the Kef LS50, a remarquable article that will interest-you, I suppose:
KEF LS50 (David) Versus JBL 4722 Cinema (Goliath) Speaker Comparison with Binaural Recordings - Reviews - Audiophile Style
You will find some very interesting acoustic recordings of this comparison.
The guy is a sound engineer and know at evidence what he is talking about.
No surprise I (And I believe Richard and some others here as well ;-) agree with all his points. Especially the fact that horns can offer a better listening experience, because they excite less the room's resonances, thanks to their directivity.
You will have confirmation that good horns do not necessary provide a colored sound on voices (on the contrary), that they can be more dynamic with transients and can illuminate small details often lost with cones.
The result is amazing for the Kef and show how wonderful can be those tiny speakers for the size/price. A pure miracle that the two systems can sound so close despite their size and technology differences. You will have confirmation too that "blind" test can be lot more difficult when you don't know what source is playing because it is so hard to correlate our feelings on different musical moments .
KEF: Hats off !!!! (And Mitchco as well)
KEF LS50 (David) Versus JBL 4722 Cinema (Goliath) Speaker Comparison with Binaural Recordings - Reviews - Audiophile Style
You will find some very interesting acoustic recordings of this comparison.
The guy is a sound engineer and know at evidence what he is talking about.
No surprise I (And I believe Richard and some others here as well ;-) agree with all his points. Especially the fact that horns can offer a better listening experience, because they excite less the room's resonances, thanks to their directivity.
You will have confirmation that good horns do not necessary provide a colored sound on voices (on the contrary), that they can be more dynamic with transients and can illuminate small details often lost with cones.
The result is amazing for the Kef and show how wonderful can be those tiny speakers for the size/price. A pure miracle that the two systems can sound so close despite their size and technology differences. You will have confirmation too that "blind" test can be lot more difficult when you don't know what source is playing because it is so hard to correlate our feelings on different musical moments .
KEF: Hats off !!!! (And Mitchco as well)
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Kii3 has directivity control down to 40Hz. Whilst not on the fly switchable like B&O it may do the directivity thing better than the horns.
I would also point you at the whole thread on here about discussing preferences in directivity and why some people migrate back to direct radiators from horns. Some very interesting discussions.
I would also point you at the whole thread on here about discussing preferences in directivity and why some people migrate back to direct radiators from horns. Some very interesting discussions.
Surprised by the rare quality of this article about Kef LS50, I went to look for other writings of this author.
I found this article on the comparison between two digital formats (16/44 vs 24/192):
16/44 vs 24/192 Experiment - mitchco's Blog - Audiophile Style
The approach is, from my point of view, irreproachable as much on the method as on its technical aspect and its objectivity.
And the result will surprise more than one.
BTW: I noted this phrase that made me smile with pleasure: "TRUST YOUR EARS".
;-)
I found this article on the comparison between two digital formats (16/44 vs 24/192):
16/44 vs 24/192 Experiment - mitchco's Blog - Audiophile Style
The approach is, from my point of view, irreproachable as much on the method as on its technical aspect and its objectivity.
And the result will surprise more than one.
BTW: I noted this phrase that made me smile with pleasure: "TRUST YOUR EARS".
;-)
The developer of the diffmaker tool is a member of this forum and he could explain it much better, but i remember that the alignement of two files is using huge amounts of memory (subsample shifting) and therefore will not work well on longer/larger files.
Wrt "ABX" we have already discussed the possible side effects in nearly every detail, so no need for repetition. (scottjoplin will be delighted
)@scottjoplin,
Were they sitting on each others laps?
Nice one..
On my point of view, the most important part is to get the same directivity between the two transducers at their crossover frequency. IE, the same emitting surface. I do not know any other easy solution to get this but horns.
What is to avoid is any brutal changes of characteristic at crossover frequencies.
That implies too to reduces the number of ways as much as possible, that is difficult to reach with cones too.
And to set the bass/treble crossover frequency as far in the bass from our earring max sensibility (2-4KHz) as possible. (600-700 seems to be optimal as it is the area where our human listening system changes its ways to analyse the directivity).
I am sure that, if some goes from horns to cones, it is because... they used poor horns+drivers. Not surprising as it is not easy to find good ones.
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It is pitiful that the consumer audio industry has made so much effort over the years to develop the cones and so few the drivers+horns, with the resulting economic and industrial consequences.
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