Very interesting experiments! Could you explain a bit more the reason to use the golden ratio in distributing the two excitation frequencies? I'm not grasping that part.
Very informative!. Those 2 are at opposite ends of price/ quality spectrum too. In my opinion, Dayton, for very resonable prices, will give you very good quality drivers, in general ( a similar patern to SB Acoustics) Eton is, in my book, stealing money from us, like a few of those other brands ( Morel, Audio Technology, Scan Speak, Seas), etc... I'm GENERALISING HERE...
I disagree on the scanspeak. If you see klippel tests, their drivers have very good performance. The 18WU for example claims 9mm xmax and tests shows 9.1mm 70% Cms limited Xmax. For reference, with other manufacturers you can expect around 5-7mm if they claim 9mm.
Very interesting work. How is this affected by level? Does the IMD amount stay relatively linear? Or are the certain levels where perhaps the Eton might outperform the Dayton?
No, the IM products rise out of the noise floor as level increases. From what I’ve observed these products increase to the square of multi-tone output level. These side bands are sometimes only -12dB down from the fundamental within a normal listening level if the right frequencies are chosen.
I was looking *only* at it’s sound quality at regular listening levels in an effort to identify measurement aspects that can be subjectively correlated to sound quality. Max SPL, although an important metric for home theatre or pro-sound use, should not be the focus for home hifi listening.
I think it would be better to do the test with the same accoustic output .ETON is 7 db(5x power wise) more sensitive so actually it will produce more IMD with the same input.
@@JosephCrowesDIYSpeakerBuilding Thanks, even if this doesn't take off as a standard, I hope you will continue to build your library of measurements. It would be super interesting to compare drivers.
Fantastic explanation of IMD and a great example of how it's not obvious in other testing mods.
Very interested in this type of testing. I hope you continue. Thanks for sharing.
Excellent concept! Thanks for sharing!
Excellent. Thank you!
Very interesting experiments!
Could you explain a bit more the reason to use the golden ratio in distributing the two excitation frequencies?
I'm not grasping that part.
I’ve since updated my testing to 12 bands of test tones per octave. 12 is a non harmonically related number and so it reveals IMD very well.
Excellent. Do speakers have something like 3rd order IMD intercept used in RF circuits? Would that be a useful metric?
Very informative!. Those 2 are at opposite ends of price/ quality spectrum too. In my opinion, Dayton, for very resonable prices, will give you very good quality drivers, in general ( a similar patern to SB Acoustics) Eton is, in my book, stealing money from us, like a few of those other brands ( Morel, Audio Technology, Scan Speak, Seas), etc... I'm GENERALISING HERE...
I disagree on the scanspeak. If you see klippel tests, their drivers have very good performance. The 18WU for example claims 9mm xmax and tests shows 9.1mm 70% Cms limited Xmax. For reference, with other manufacturers you can expect around 5-7mm if they claim 9mm.
"Audio Science Review" would probably happy to collaborate with you on this.
Thank you. I did post my results to Audio Science Review. Amirm complimented me on my IMD chart. 🙂
Clever stuff dude! Love it xx
Very interesting work. How is this affected by level? Does the IMD amount stay relatively linear? Or are the certain levels where perhaps the Eton might outperform the Dayton?
No, the IM products rise out of the noise floor as level increases. From what I’ve observed these products increase to the square of multi-tone output level. These side bands are sometimes only -12dB down from the fundamental within a normal listening level if the right frequencies are chosen.
Is there any chance you have an rss feed? Cannot find it on your website.
Thanks!
This is something I’ll have to look into. Thanks.
The Dayton does almost double the xmax, with a sub you would definitely want that so you don't bottom out the woofer at low FS.
I was looking *only* at it’s sound quality at regular listening levels in an effort to identify measurement aspects that can be subjectively correlated to sound quality. Max SPL, although an important metric for home theatre or pro-sound use, should not be the focus for home hifi listening.
I think it would be better to do the test with the same accoustic output .ETON is 7 db(5x power wise) more sensitive so actually it will produce more IMD with the same input.
They were certainly level matched.
@@JosephCrowesDIYSpeakerBuilding Thanks for your reply
Was the final IMD chart SPL-matched? And, if so, at what SPL? Love the initiative, btw.
Thank you. They were SPL matched at 90dB SPL at 1 meter.
@@JosephCrowesDIYSpeakerBuilding Thanks, even if this doesn't take off as a standard, I hope you will continue to build your library of measurements. It would be super interesting to compare drivers.
Your audio was too low Sir.