Nearfield "truly" fullrange speaker with Dayton RS100-4

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#41
Booger weldz said:
can a dolphin ‘see’ around corners ?
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I don't think so. I think we can be pretty sure of this, based on what we know about the way waves travel through a medium, diffract, and reflect.

I think if the sonar waves were long enough wavelength to "go around" the corner, they would also be too long to provide any good image resolution.

And if the waves were short enough to provide a good image, they would be too short to go around the corner.

Catch 22!

-Gnobuddy
 
#43
Gnobuddy said:
For fun, I entered the Dayton RS100-4s parameters into Qspeakers, and played with it a little.

Qspeakers thinks a 2.3 litre ported enclosure, with the port tuned to 67 Hz, produces a pretty flat response, with a relatively gentle bass roll-off, and still gets down to 66 Hz (-3 dB).

I like White Dragon's suggestion (post #37). A pair of Dayton RS100-4 in 2.3 litre enclosures with the above tuning could cross over to a sub at 70 Hz or so, which is low enough to have no problems with directionality or "phantom bass" appearing to come from somewhere else.

I know the original intention was to avoid a subwoofer. But 4" speakers are tiny little things. IMO it's hard to get them to go much below 70 Hz with any reasonable sensitivity or SPL capability.

-Gnobuddy
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Thank you. But a sub-woofer is out of discussion, I need these speakers to be compact and easily moved around. Same reasoning goes for a 8" woofer.

What do you mean with a "gentle bass roll-off"? You mean with a shallow almost 3rd order slope?
If I enter that data into WinISD it still looks like a 4th order (@60Hz it's down 3dB and @30 Hz is down 30dB so it's a 27dB difference). Just like the bigger 4L box tuned to 60Hz (in black). Also it starts rolling off way earlier, at around 100Hz.
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#44
It seems that you then run into the hoffman iron law. Such a small driver will never go real low on high volume, that is physical impossible. Your tuning is probally the best you can get with it.

In any way, the driver was ment to be used with a subwoofer, not to be used alone.
 
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