I used Shure SE535 since 2013 for years. Got SE846 in 2020 and liked them so much for a quad driver that I ordered some UE 11 CSX. Sound quality matters. It's so cool to hear the differences like this in these videos. Excellent stuff, Dave.
also, if the 'back-pressure' (the energy of the driver pulling back the opposite direction) is routed/tuned somehow thru a channel/tube/waveguide to be timed to sum with the forward moving wave/pressure you're introducing modulation problems, because the positive pressure wave that's channeled to positively sum with the forward moving wave is from a different TIME... You're summing sound from a half-cycle ago, with current sound, you're going to change the character of the sound and smear it in the time domain... this would be like adding a single delay to the sound that's as a single frequency and adding it back into the signal with 100% wet, and 100% dry signals and it WILL sound terrible.
Getting the back pressure to be in phase with the forward pressure is pretty simple to do as long as the distances involved are relevant in relation to the wavelengths involved. That said, the distances involved with in ears are so small that they're not very irrelevant for frequencies below the kHz range. Alternately setting up a hemholtz resonator can delay the back pressure in time a bit but again the size of the resonator increases with the wavelength of the frequencies involved, you'd have to have some mighty big ears to do anything involving low frequencies Fortunately, unlike subwoofers, for in ears and headphones, we can typically discard the rear radiated sound and focus on optimizing the forward pressures. But you there sealing off the rear sound or directing it away from the ears such that it's not interactive with the forward pressure
the louder and quieter sound created by cupping one's hand around the speaker is NOT from PHASE... it's because BEFORE cupping the hands around the driver, the sound is radiating in 180 degrees.. i.e. the energy from the FRONT side it spreading out forward, and at angles... all the 'power' of the waves is spreading out... but when you form a CONE around it with your hands, all of the pressure waves are being forced to propagate at reduced reduced angle of dispersion... so, instead of the soundwaves being allowed to just spread out thinner and thinner in all directions, you're basically corralling ALL of the energy and focusing it in a narrower more coherent beam of energy forward toward a point or area of focus... it has nothing significant to do with the inverse phase on the other side in earphones...
Cupping hands or forming a horn or wave guide is not a phase related adventure. If you want to look at it from an electronic perspective, it would be more akin to it and impedance matching transformer. Wherein The voice of the human or the compression driver or the speaker has a very low impedance acoustic output and does not have a lot of displacement but has a significant amount of force or current equivalent. Open air on the other hand is more like a high impedance input where large surfaces moving very little will connect much more efficiently to the air and a small surface moving a whole lot. A horn or cupping of hands is like an impedance matching transformer that allows the low impedance acoustic source to couple to the high impedance air. But you never get something for nothing so the sacrifice is directivity is reduced and frequency range tends to be more band limited. Horns will be very efficient over a narrow range and less efficient above and below that. This is why cupping your hand sounds honky or mid-rangey compared to a voice which has a more full range sound when there's no cupped hands or horn
Hmmm, not really, the servo drive had a rotary motor that rotated a fraction of a turn back and forth and had two belts attached to the rotor. One end of each belt was attached to the center of two opposing cones such that when the motor turned one way the cones moved toward each other and when it moved the other way, the cones moved away. A balance armature is more similar to a phonograph needle where a magnet is suspended between two coils or a coil is suspended between twom magnets. For a phonograph needle, motion creates voltage, for a balanced armature , voltage on the coil creates motion
Can a voicecoil driver in reverse be used as a microphone ? And (maybe even more interesting) can a BA driver in reverse be used as a microphone (and if yes, how does it sound) ?
Voice coil driver can definitely be used as a mic, not sure about BA. The little headphone driver may not necessarily sound good, but it would work (that’s what a dynamic mic is).
I have done a BA as mic vid. May be on the member side of my TH-cam channel. Also, just found an old telephone handset with a BA type mic, may do a vid in it
wow, i would take this video as a university lesson
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Best explanation I have come across. Well done, thanks for the info!
ABC lesson for beginners. Good work! Thank you.
I used Shure SE535 since 2013 for years. Got SE846 in 2020 and liked them so much for a quad driver that I ordered some UE 11 CSX. Sound quality matters.
It's so cool to hear the differences like this in these videos. Excellent stuff, Dave.
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also, if the 'back-pressure' (the energy of the driver pulling back the opposite direction) is routed/tuned somehow thru a channel/tube/waveguide to be timed to sum with the forward moving wave/pressure you're introducing modulation problems, because the positive pressure wave that's channeled to positively sum with the forward moving wave is from a different TIME... You're summing sound from a half-cycle ago, with current sound, you're going to change the character of the sound and smear it in the time domain... this would be like adding a single delay to the sound that's as a single frequency and adding it back into the signal with 100% wet, and 100% dry signals and it WILL sound terrible.
Getting the back pressure to be in phase with the forward pressure is pretty simple to do as long as the distances involved are relevant in relation to the wavelengths involved.
That said, the distances involved with in ears are so small that they're not very irrelevant for frequencies below the kHz range.
Alternately setting up a hemholtz resonator can delay the back pressure in time a bit but again the size of the resonator increases with the wavelength of the frequencies involved, you'd have to have some mighty big ears to do anything involving low frequencies
Fortunately, unlike subwoofers, for in ears and headphones, we can typically discard the rear radiated sound and focus on optimizing the forward pressures. But you there sealing off the rear sound or directing it away from the ears such that it's not interactive with the forward pressure
I will buy some in ears in the future. Thanks for the info
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Interesting, I had no idea. Thanks for the info brother!
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i just got a set of armature iems, not expensive. there the kx as10s from amazon. couldnt believe how good they soundedand the low end was nice.
They are not bright in the 3k range? Do they have a thin plastic shelll that makes a boxy plastic sound when the cable is touched?
I got those, and they are in fact also bright as bassy, mid-range feels very soft and not forced, such a good sounding and very fun IEM's@@DaveRat
Great video . I was wondering the difference too. I have to 1more quads & p50
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the louder and quieter sound created by cupping one's hand around the speaker is NOT from PHASE... it's because BEFORE cupping the hands around the driver, the sound is radiating in 180 degrees.. i.e. the energy from the FRONT side it spreading out forward, and at angles... all the 'power' of the waves is spreading out... but when you form a CONE around it with your hands, all of the pressure waves are being forced to propagate at reduced reduced angle of dispersion...
so, instead of the soundwaves being allowed to just spread out thinner and thinner in all directions, you're basically corralling ALL of the energy and focusing it in a narrower more coherent beam of energy forward toward a point or area of focus... it has nothing significant to do with the inverse phase on the other side in earphones...
Cupping hands or forming a horn or wave guide is not a phase related adventure.
If you want to look at it from an electronic perspective, it would be more akin to it and impedance matching transformer.
Wherein The voice of the human or the compression driver or the speaker has a very low impedance acoustic output and does not have a lot of displacement but has a significant amount of force or current equivalent. Open air on the other hand is more like a high impedance input where large surfaces moving very little will connect much more efficiently to the air and a small surface moving a whole lot.
A horn or cupping of hands is like an impedance matching transformer that allows the low impedance acoustic source to couple to the high impedance air.
But you never get something for nothing so the sacrifice is directivity is reduced and frequency range tends to be more band limited.
Horns will be very efficient over a narrow range and less efficient above and below that.
This is why cupping your hand sounds honky or mid-rangey compared to a voice which has a more full range sound when there's no cupped hands or horn
Thanks Rat... As Always Very Informative.
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Thanks 😊 interesting as always
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So balanced armatures are micro versions of the old servo drive subs tours used to use, but full range reproduction.
Hmmm, not really, the servo drive had a rotary motor that rotated a fraction of a turn back and forth and had two belts attached to the rotor. One end of each belt was attached to the center of two opposing cones such that when the motor turned one way the cones moved toward each other and when it moved the other way, the cones moved away.
A balance armature is more similar to a phonograph needle where a magnet is suspended between two coils or a coil is suspended between twom magnets.
For a phonograph needle, motion creates voltage, for a balanced armature , voltage on the coil creates motion
@@DaveRat ah! Thank you, yes…that is better. And makes better sense to me. 🫶🏻
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Grate. Got a better ida of both technology now.
Cool cool!
I have expensive BA iems and i can hear it fluttering/crackling in mid frequencies
Thanks dude
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cheers
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❤️ love from India ❤️
Thank you and looking forward to visiting majestic India someday!
@@DaveRat 🙏🏻 hearty welcome, will be waiting 💖
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Can a voicecoil driver in reverse be used as a microphone ? And (maybe even more interesting) can a BA driver in reverse be used as a microphone (and if yes, how does it sound) ?
Voice coil driver can definitely be used as a mic, not sure about BA. The little headphone driver may not necessarily sound good, but it would work (that’s what a dynamic mic is).
@@mrufino1 Since Dave already killed his inear chassis, maybe he could try it with these BA drivers
I have done a BA as mic vid. May be on the member side of my TH-cam channel.
Also, just found an old telephone handset with a BA type mic, may do a vid in it
Cool Bones Brigade shitt☠
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1st :p
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