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Golden ratio bass horn
Golden ratio bass horn
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Old 31st December 2017, 01:34 AM   #31
planet10 is offline planet10  Canada
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Golden ratio bass horn
GM,

If you remind me of hoe you plot the length around a corner i can develop a map of the points shown into a straight approximation.

dave
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Old 31st December 2017, 02:01 AM   #32
GM is offline GM  United States
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Sweet! Soho's way is the current one [71.4 cm]: http://www.avsforum.com/forum/155-di...l#post23714966

GM
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Old 31st December 2017, 09:00 PM   #33
planet10 is offline planet10  Canada
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1st detail translates to the 2nd with length in mm/in and area in cm2

dave
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File Type: png GR-Horn-Area.png (14.9 KB, 174 views)
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Old 5th January 2018, 02:31 AM   #34
freddi is offline freddi  United States
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Golden ratio bass horn
with the offset driver - hornresp could use another section to put the driver where it belongs - can't quite fudge it with the last part having length but essentially no expansion. Is there a good fudge with hornresp?

this may be off in expansion - have to look closer at P10's CAD sketch

has anyone simmed this yet?

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Old 5th January 2018, 07:47 AM   #35
foreveryoung is offline foreveryoung  Viet Nam
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Quote:
Originally Posted by planet10 View Post
Phase plugs for the drivers, basket damping and/or more radical mods.

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dave
Thanks for the tip!

I've seen a guy modded this plug as well. Does it make any audible difference? Why the speaker driver manufacturer does not use this plug in their products?
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Old 5th January 2018, 07:38 PM   #36
planet10 is offline planet10  Canada
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The plugs make a positive difference IMO. And hundreds of diyers have installed the plugs in their FE20x and i have only gotten positive comments back. Many were “i don’t know why these don’t come factory installed".

I can only guess on that — cost and momentum perhaps — i have not seen any Fostex drivers with phase plugs. Drivers with whizzers seem to universally benefit from phase plugs. But the driver thou that seems to benefit most is the Visaton B200.

dave
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Old 5th January 2018, 08:38 PM   #37
Walloffound is offline Walloffound  United States
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What effect does the phase plug have on the sound? Is there one available for the Visaton bg20?
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Old 5th January 2018, 09:36 PM   #38
planet10 is offline planet10  Canada
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I have my theories. From my web-page:

Quote:
The phase plugs work primarily 2 fronts. 1st they fill the hole left when the dust cap removed. The air trapped in the cylinder inside the voice coil and above the pole piece causes what is called an "oil-can resonance". This invariably causes some midrange distress. Removal of the dustcap and filling the hole pretty much eliminates this source of coloration. The 2nd thing the phase plug does is to effectively halve the diameter of the cone. Any side-to-side standing waves, reflections, etc are pushed up about an octave. Related to this is an improvement in high frequency dispersion, widening the sweet-spot, and reducing the laser-like hot spot some full-range drivers suffer from. The smaller effective cone diameter means that the point at which beaming starts is pushed up and due to the shaped nature & the hardness of the plugs some HF energy is redirected.
Quote:
Visaton BG20
Same specification of voice coil as B200 so B200 plugs likely will fit, but you need to remove dustcaps and measure. The FE16x plug is slightly less diameter (and shorter). If the available plug is a bit too large they can be sanded down (which i had to do to use FE10x plugs in the Coral holey basket version of the FE103A).

dave
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Old 6th January 2018, 02:33 PM   #39
foreveryoung is offline foreveryoung  Viet Nam
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Thanks man, must try then, have a pair of Visaton collecting dust
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