Hemi-Demon
Senior Member
- Joined
- Jan 17, 2019
- Messages
- 440
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- 517
For a while I thought this is not North Korea where dictator decides what data people need to see and what is important or just interesting for them. But of course you have every right to keep others deaf, idiots or minors under your guardianship. I can't tolerate such arrogance so hopefully someone with moderator rights is able to erase me if you can't.
You are talking about single wide band systems such as amplifiers. That kind of simplified assumption is not whole truth with multiway loudspeakers having both mechanical and acoustical links between different ways/bands. Already mentioned few mechanisms such as cone of conventional hifi coaxial (Kef, Seas etc) which acts like wave guide vibrator causing IMD products at HF. That is completely different than result of non-linearities of individual radiators, and can be higher and more audible than harmonics - especially in 2-way applications. PA coaxials usually have some kind of wave guide for tweeter which isolates wavefront of tweeter from vibrating cone so sound clarity could be significantöy better than with hifi coaxial. Another already mentioned mechanism is pressure leak to rear side of the radiator. Leak biases operating point of the motor causing intermodulation products. This happens if designer assumes that tweeter is sealed while it's actually not (enough). This is not all.
Measurement as harmonics is also limited to bandwidth of output port/stage so you cannot measure non-linearities as harmonics in acoustical domain above ca. cone break-up freq. / 2 without multi-tone.
Ok. Your turn to demonstrate that you know at least something about this topic. No problem to accept that you can't make too much noise in the house with multi-tone measurements. Just be honest.
North Korea references, talk about reaching. Why not take one speaker Amir has reviewed, like say a Kef design (since you keep referencing them), and perform a comparative complete review based upon you technical acumen and post it to your blog, forum or just post it here on ASR. If Amir is doing it wrong, show him how to improve. Just stating that he is wrong is no better than all the various youtube subjective reviews Or better yet produce one of your designs, or at least show some of the data that you are alluding to, over and over. It is not fair to take shots left and right, then flip like you are persecuted, and then scream erase me, without any proof from your vantage point. We are all trying to learn, prove you side.