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Old 25th August 2017, 10:49 AM   #81
nuconz is offline nuconz  United States
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well that killed the dialogue...
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Old 25th August 2017, 06:35 PM   #82
KaffiMann is offline KaffiMann  Norway
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Originally Posted by nuconz View Post
well that killed the dialogue...
I do not know, but adding something to the cone will make it heavier. It may also be that some of the benefits of removing the dust cap is not related to the shape or size of the dust cap, but maybe you are reducing the "air spring" effect of the driver right at the center where most high frequencies originate from, maybe the small chamber inside the voice coil has resonances in high frequencies and simply removing this chamber helps. This is just me thinking though, so don't read it as anything else.

It has been documented a few times the effects of cutting away the dust cap and putting in a phase plug, there are threads containing info about this stuff. But they focus more on the phase plugs, and maybe not the effect of the chamber in the vc and its possible resonances reverberating back through the dustcap.
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Old 25th August 2017, 06:55 PM   #83
nuconz is offline nuconz  United States
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Originally Posted by KaffiMann View Post
I do not know, but adding something to the cone will make it heavier. It may also be that some of the benefits of removing the dust cap is not related to the shape or size of the dust cap, but maybe you are reducing the "air spring" effect of the driver right at the center where most high frequencies originate from, maybe the small chamber inside the voice coil has resonances in high frequencies and simply removing this chamber helps. This is just me thinking though, so don't read it as anything else.

It has been documented a few times the effects of cutting away the dust cap and putting in a phase plug, there are threads containing info about this stuff. But they focus more on the phase plugs, and maybe not the effect of the chamber in the vc and its possible resonances reverberating back through the dustcap.
a dust cap can be made of paper, felt, aluminum and a mixture. the 12lta is probably made of paper. i wonder if replacing it w/ a felt one might improve the response?
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Old 25th August 2017, 09:34 PM   #84
planet10 is offline planet10  Canada
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8" Hall of Fame
Quote:
Originally Posted by nuconz View Post
if 2 screws are put in the base of the phase plug & the plug width is as wide as possible, but not touching the coil, then the proper fitment is achieved by trial & error?
We use 3 screws on the FE20x plugs, 4 of the 12LTA plugs.

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this sounds kind of hokey to me. it seems that a phase plug might slip off center & scrape the coil.
It does happen, but once set rarely happens in use. If one wants to have them unremovable, you could glue them in with epoxy, but care must be nade to not have any slip out and glue the voice coil down.

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what about omitting the plug altogether or use a different more linear dust cap?
Then you have not solved the problem of the oil can resonance you are trying to get rid of.

dave
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Old 27th August 2017, 12:06 AM   #85
jacozz is offline jacozz  Sweden
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The best 8 inch driver in a system I've heard was this: SonicFlare - Hi-Fi reviews, audio events, show coverage, photos and more Review: Earo Eight Loudspeakers

Active amp and EQ built in the cabinet. Looks like a modified fostex 206 driver I think.
I also listen to the Voxativ Horn (Ampeggio), with a high end tube amp, but the Earo 8 was much better to my ears in fact, by a large margin.
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