(Elector) New speaker material increases 'back [enclosure] volume'

[counter culture]

Miracle Material Doubles Speaker Volume For Better Bass Response - ELEKTOR.com | Electronics: Microcontrollers Embedded Audio Digital Analogue Test Measurement

 

[lduarte1973]

pictures ?

 

[Don Hills]

Pictures at the link. Its main target market appears to be cellphones. (There's a lot of work being done on improving the performance of transducers for use in cellphones, tablets etc.)

 

[lduarte1973]

would be good to have that material for hifi speakers

 

[picowallspeaker]

I was listening today at one of the latest android cell phones , and the ringing tone - the classic 'DRIIIIIIIN !' - was very powerful , fine and detailed
Indeed , I was using a 3/4" multimedia speaker - found in a LCD monitor - with a waveguide as a tweeter .It's rated at 2W/4Ω .
If someone's looking for cheap & powerful tweeters , this is it

 

[tvi]

EP2424270 seems to be the patent and is similar to US2010074463 that uses carbon instead of zeolite.

 

[tvrgeek]

High tech wool. Whoopee.

 

[Wavebourn]

I use memory foam since 2006 when I first saw mattresses. They were pretty expensive, but I found factory rejects on epay. I don't know how this fancy patented materials are better, though...

 

[Elvee]

I use memory foam since 2006 when I first saw mattresses. They were pretty expensive, but I found factory rejects on epay. I don't know how this fancy patented materials are better, though...

Does it actually lower the resonance frequency of the assembly?

 

[tvrgeek]

I use memory foam since 2006 when I first saw mattresses. They were pretty expensive, but I found factory rejects on epay. I don't know how this fancy patented materials are better, though...

To suppress reflections or as friction filler?

 

[jneutron]

I use memory foam since 2006 when I first saw mattresses. They were pretty expensive, but I found factory rejects on epay. I don't know how this fancy patented materials are better, though...

The description of operation on the site is useless.

If one wished to increase the apparent size of the enclosure, slow down the propagation velocity of the sound. That appears to be what they did.

jn

 

[DF96]

Frictional losses would help too, by turning sound into heat. At the lowest frequencies any packing will help 'expand' the enclosure volume by making things nearer to isothermal rather than adiabatic.

 

[jneutron]

Frictional losses would help too, by turning sound into heat. At the lowest frequencies any packing will help 'expand' the enclosure volume by making things nearer to isothermal rather than adiabatic.

Agreed. Unfortunately at bass frequencies it becomes very difficult.

IIRC, Abraham B Cohen spoke about it at length.

As I also recall, the old JBL cabs used a lens assembly on the mid/tweeter horn assembly to force a wider horizontal dispersion. It used multiple metal vanes corrugated, with the smaller depth at the center of the horn, moreso on the sides. The result was claimed by JBL to slow down the prop velocity on the sides more than the middle, which resulted in a more spherical waveform.

Microwave engs did the exact same thing for lensing as well, I recall larnin that back in '74.

Cheers, jn

 

[Chris Hornbeck]

Fibrous tangles as used in "transmission line" cabinets reduce the speed of propagation by a factor of 2 to 3. Seems to work by PFM, but measurably true.

Thanks,
Chris

 

[Wavebourn]

To suppress reflections or as friction filler?

It suppresses reflections turning mechanical energy into heat.