Maybe you should study up on beaming
I am totally familar with beaming. It affects directivity, not ability to reproduce a signal.
Maybe you should study up on beaming
Maybe you should study up on beaming. It was my post and I said NOTHING about resonance. Put your words in your own mouth. Don't mis-interpret what I say, thank you.
Ok forget about what I said before. I just tried it again. This time with the Focal Clear, which has a smaller and stiffer 40 mm driver, compared to the 80 mm of the lcd2c (which means more excursion for the same spl, I suppose). this time I tried a combination of 80 hz (because the clear doesn't like frequencies well below 50 hz), and 6k. I played the 6k tone, and as soon as I added the 80 hz I could hear a lot of very clear sidebands to the higher frequency. I also tried combination of other very low and very high frequencies and they also were clearly audible. The same combination of tones on the lcd2c results in a much cleaner upper frequency.
I don't know if this is in fact Doppler distortion, or some other kind of IMD that's unrelated (I made sure I'm not crossing 0 Dbfs with the combining waves, obviously).
OK, Had a late night and I'm rather tired and probably being completely dumb, but what is the difference to FM where you would get sidebands?Intermod shows as bands at f1-f2, f1+f2, and combinations of nf1+/-mf2, where n and m are integers.
Doppler will show frequency shift that's velocity dependent. So if the the bands don't broaden and the broadening isn't a function of the lower frequency amplitude, it's not Doppler.
FM must be demodulated and is not the audible result ?
When one would record a stereo signal with just 2 mics (or dummy head) and one reproduces that would there not be any doppler effect ?
There would be IM due to non-linearties but the reproduced signal is what the mic produced and not multiple electrically summed signals.
but what is the difference to FM where you would get sidebands?
When one would record a stereo signal with just 2 mics (or dummy head) and one reproduces that would there not be any doppler effect ?
FM must be demodulated and is not the audible result ?
OK, Had a late night
Think of the voice coil. The fastest rate of change and physical displacement is at the steepest part of the waveform. Doppler distortion would be greatest when a higher frequency is attempting to be reproduced over a lower one as opposed to the peaks of the waveform where rate of change (and physical movement) is less.
Doppler requires movement of either the source or the mic or both. (Or in this case the dummy head with respect to the source). No movement- no Doppler.
but you can FM modulated an audio signal.
Im not specifically referring to audibility, but no it doesnt have to be demodulated, well it does if the carrier is a radio wave, but you can FM modulate an audio signal.
so with the speaker the higher frequency wave is being compressed and rarefied by the lower frequency signal. Its frequency is going up and down.
Doppler requires movement of either the source or the mic or both. (Or in this case the dummy head with respect to the source). No movement- no Doppler.
with the speaker the higher frequency wave is being compressed and rarefied by the lower frequency signal. Its frequency is going up and down.
and think of any signal being frequency modulated by a sine wave. does it not do the same thing?