A History of Speakers
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- Опубликовано: 6 сен 2024
- David Clark talks about and shows his collection of speakers from a Bell receiver and a Western Electric 555 receiver, through planar magnetics to NXT and carbon nanotubes, with a trip through the Heil AMT by guest Kurt Lyons
I'm watching this again...for about the third time, I love this guy he is brilliant. Please send my thanks to him for the education.
You are never too old to learn something new every day .....Great upload....thanks guys ........
The original piezoelectric material was crystals of Rochelle salt, which were used primarily for microphones, but around 1930 the Brush microphone company patented a 7 inch full range speaker using a large crystal of Rochelle salt. It probably never went into actual production and likely was just a prototype. Anyway, modern ceramic piezo transducers of the type originally developed by Motorola are indeed used as contact mics inside the body of an acoustic guitar or underneath the bridge saddle, as strain guage sensors for building movement during earthquakes and for monitoring stress cracks, and so on.
It's also worth mentioning that Meitner/Musatex had a range of dipole speakers using a stretched Mylar diaphragm driven by a standard voice coil and magnet assembly (they bought the patent from somebody else in Canada); and there was a company back in the 80s who was selling flat panel speakers, perhaps similar to a magnapan, that were the size of a ceiling grid and designed as a drop-in replacement for ceiling tiles, for paging and background music use in commercial buildings.
I also haven't figured out how it was that we ended up with a bunch of small speakers with square woofers back in the 80's!
Very interesting, enjoyed this. I have been in the car audio biz since 1976, on the aftermarket side, retired now. It was very captivating to hear about the technologies being developed in the car manufacturers audio sector. You were mentioning various transducer designs, it made me grab my old Electrophonics Tranducer I have hanging around, never really installed, but held it to a gypsum board wall played some music, results were um, fair, lol, definitely not Hi Fidelity. The Monsoon systems did sound pretty darn good, took some biz away from me, hehe. Another system I remember , kind of a sleeper, quite common, was the 1986 Sunbird/Cavaliar 5 band EQ head unit, with the 3.5' in front, 6x9's in rear, Pontiac had the AMR speakers. That trunk space, with 6x9's, not a bad sound for a stock system, for the buck. I had one, I tapped in a Kenwood EQ into the pre-amp of the stock head unit, that driving a 4 ch Alphasonic amp, and another Alphasonic bass amp with 2 ten inch woofers in trunk, Zeppelin to Bach sounded sweet :) Very cool channel, very informative.
I never had the Heil AMT's, but I worked in a used stereo store for a couple of years and found the AMTs sound was very good. Very smooth. In fact, at the same store, I bought some Sequerra Pyramid 2+2 speakers and they had T-1 ribbon tweeters. They sounded good, but not as good as the AMTs, IMO. But yeah, we had to resurround the woofers like crazy.
Very good speech, except if you'd been British you would have mentioned The Celestion loud speaker which was launched early in 1925 and was favourably reviewed by ‘Popular Wireless’ as “a high-class instrument capable of high-class performances”. It built on the work of loudspeaker pioneer Eric Mackintosh, setting out to improve his invention - one of the earliest cone loudspeakers.
More like this!
Thank you for sharing.
very cool as always,
Nice history, thanks for posting.
Thnkyou sir.
Diaphragms or ribbons radiating directly into the air are not linear, they lack the impedance matching required to keep distortion low. Now I’m not talking about electrical impedance matching but rather air loading impedance matching. It still has a similar distortion effect. A horn can match the acoustical impedance mismatch and lower the distortion, however at the cost of resonant frequency problems within the horn. But all these resonant problems are mechanical and therefore recursive, which they can be perfectly cancelled with IIR digital filters (dsp with power amps), FIR filters can never correctly cancel the problem because they can only cancel poles the of the mechanical resonances but never the zeros. DSP at 32 bits and 96 K is truly transparent, which we can debate later. I hope to join the club and see if we can push the technologies! Thank you!
In addition, I thought it would be correct to add that hi-fidelity means faithful reproduction and sound pressure level is an important part of that. If I close my eyes and hear sound similar but at a much lower volume than I would hear in the 8th row, than I would not say that this is an accurate reproduction of the performance. No ribbon or flat panel can reproduce full concert levels of orchestra or pipe organ.
nice expl.........
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