Click title to read one, or click date to read all below it.
04-28-12
Smaller bass drivers have gained in popularity for two reaso ... Jmcgrogan2
04-28-12
Boy you are old. listening to music in the 70s. smaller driv ... Sounds_real_audio
04-28-12
Bigger isn't always better. i keep telling myself that. ... Ngjockey
04-28-12
1) size of the driver is related to efficiency in producing ... Davide256
04-28-12
Avs9 writes: but nowdays i am seing 6 inch drivers stated a ... Drew_eckhardt
04-28-12
It turns out the large woofers of the '60s and '70s were cou ... Johnnyb53
04-28-12
Thanks, folks. once again i came to realize to helpful the a ... Avs9
04-28-12
If you are interested in dynamic speaker drivers and technol ... Mapman
04-28-12
more or less true, but bear in mind that a 12" woofer h ... Johnnyb53
04-28-12
04-28-12: johnnyb53 more or less true, but bear in mind that ... Drew_eckhardt
04-29-12
Drew, i agree more than disagree. dispersion can definitely ... Johnnyb53
04-29-12
if 12" drivers were as fast and accurate as 4" dr ... Sounds_real_audio
04-29-12
drew, why are you adding 6db? it's power output, you should ... Bombaywalla
04-29-12
Back in the late 70s when i sold gear at tech hifi, bass dr ... Mapman
04-29-12
Real bass comes from moving a large surface area gently -not ... Tamule1
04-29-12
It is cheaper to make a good small speaker with smallish dri ... Onhwy61
04-29-12
and you base this opinion on what? what then shall we call ... Johnnyb53
04-30-12
04-29-12: sounds_real_audio if 12" drivers were as fast ... Drew_eckhardt
04-30-12
Excellent insights from drew, as usual. on the question tha ... Almarg
04-30-12
Some have argued that larger drivers will have greater energ ... Unsound
04-30-12
04-30-12: unsound some have argued that larger drivers will ... Drew_eckhardt
05-01-12
Oops, i hope the moderators see this and cancel my pending o ... Waj4all
05-01-12
A driver is not characterized just by its size. some 12 and ... Eldartford
05-01-12
04-29-12: johnnyb53 04-29-12: tamule1 real bass comes from m ... Drew_eckhardt
05-01-12
My pmc fb1i signature speakers have a 6.5" driver and g ... Lloydc
05-01-12
I currently own - and will continue to into the forseeable f ... Phusis
05-01-12
"hoffman's iron law". first formulated back in th ... Johnk
05-01-12: Mapman
Probably a topic for a different thread, but I would be really interested in better understanding how the better known Walsh style driver/designs differ from the more conventional approach in terms of these common parameters that help determine speaker performance.
How does a downward oriented, open-back Walsh driver manage to deliver seemingly flat and extended frequency response at very high SPLs horizontally in a largely omnidirectional manner compared to a say a single similar sized conventional driver generally firing more directly at the listener?
The answer seems to lie somewhere in the domain of "wave bending" in the Walsh theory, as opposed to pistonic motion which I believe accounts for most of the output associated with traditional dynamic designs?
I kind of understand the theory based on wave propogation through materials of different density "bending" or diffracting the wave, but would have no clue how to relate it in technical terms comparable to what Drew and others here have so eloquently related, nor how to apply it effectively in practice, other than via trail and error perhaps.
Here's what Wikipedia has to say about it FWIW:
"Bending wave loudspeakers
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The neutrality of this section is disputed. Please see the discussion on the talk page. Please do not remove this message until the dispute is resolved. (October 2010)
Bending wave transducers use a diaphragm that is intentionally flexible. The rigidity of the material increases from the center to the outside. Short wavelengths radiate primarily from the inner area, while longer waves reach the edge of the speaker. To prevent reflections from the outside back into the center, long waves are absorbed by a surrounding damper. Such transducers can cover a wide frequency range (80 Hz to 35,000 Hz) and have been promoted as being close to an ideal point sound source.[49] This uncommon approach is being taken by only a very few manufacturers, in very different arrangements.
The Ohm Walsh loudspeakers use a unique driver designed by Lincoln Walsh, who had been a radar development engineer in WWII. He became interested in audio equipment design and his last project was a unique, one-way speaker using a single driver. The cone faced down into a sealed, airtight enclosure. Rather than move back-and-forth as conventional speakers do, the cone rippled and created sound in a manner known in RF electronics as a "transmission line". The new speaker created a cylindrical sound field. Lincoln Walsh died before his speaker was released to the public. The Ohm Acoustics firm has produced several loudspeaker models using the Walsh driver design since then.
The German firm, Manger, has designed and produced a bending wave driver that at first glance appears conventional. In fact, the round panel attached to the voice coil bends in a carefully controlled way to produce full range sound.[50] Josef W. Manger was awarded with the "Diesel Medal" for extraordinary developments and inventions by the German institute of inventions."
Mapman (Reviews | Threads | Answers | This Thread)
05-01-12
drew, it's pretty obvious i was responding to tamule1 and n ... Johnnyb53
05-01-12
I tend to look at it from the perspective of basi physics. ... Mapman
05-01-12
All you have to do is go to parts express or madisound websi ... Ngjockey
05-01-12
I tend to look at it from the perspective of basi physics. ... Mapman
05-01-12
I wonder as to whether the experts in this thread would have ... Waj4all
05-02-12
The great responses above my prior post actually relate to t ... Waj4all
05-02-12
Low frequency extension depends on spl. if toy woofers (sor ... Eldartford
05-02-12
Eldarford has a very good point. i, for one, never thought o ... Waj4all
05-02-12
05-01-12: waj4all i wonder as to whether the experts in this ... Drew_eckhardt
05-02-12
yes. it comes down to coupling the bass output to the room ... Johnnyb53
05-02-12
Thanks for the responses to my own queries. hopefully these ... Waj4all
05-03-12
"however, for those whose first-priority is realism, se ... Mapman
05-03-12
By the way, if you listen to rock concert music, nothing bea ... Eldartford
05-03-12
"by the way, if you listen to rock concert music, nothi ... Mapman
05-03-12
By the way, continuing from the outline of my experiences ci ... Waj4all
05-03-12
"i really can't think of anything much worse than a lar ... Mapman
05-03-12
My drivers only five feet, i don't no how he sees over the s ... Tmsorosk
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