Faseplugg????

[lark]

Mange høyttalerelementer har en faseplugg. Men hvilken funksjon har egentlig denne?

 

[mteinum]

planet10-hifi lager plugger til bla. fostex for diy modifikasjon

http://www.planet10-hifi.com/pp-info.html

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.

 

[lark]

planet10-hifi lager plugger til bla. fostex for diy modifikasjon

http://www.planet10-hifi.com/pp-info.html

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.

Hæ?

 

[Kabeldragern]

En faseplugg forbedrer strålingsmønstret vs. frekvens for et høyttalerelement.

I all hovedsak for å unngå peaker (økning i output ved en viss frekvens) og dipper (minking av output ved en viss frekvens), men også for å kunne ende opp med et enklere delefilter.

 

[oyvine]

Hei,
jeg har et nummer av AudioXpress liggende hvor Dr. Mark MCKenzie kjører en ganske vill modifikasjon av et lite tangband-element (audioXpress 12/04: Remaking Tang Band's W3-881S). Her er hans forklaring på hva en faseplugg er/gjør:

"The second modification is to replace the dust cap with a custom "phase" plug. I place "phase" in quotation marks because the operation of the plug has nothing to do with phase. You are not bouncing sound off of it and phasing it with sound coming from the diaphragm. Instead, there is a mass of air sitting against the diaphragm. Some of this air actually molecularly adheres to the diaphragm. When the diaphragm moves, the air mass moves with it as well as being compressed or rarified. The plug sitting in the center of the diaphragm changes the volume of this air mass and also changes the volume shape of the air adhered within the cone area. This plug is actually controlling the air mass loading on the diaphragm. Change the diaphragm loading and you will change the response. Although long and truly a mouthful, I suppose that "diaphragm air mass loading regulator" is a more accurate descriptor of what this device does than phase plug."

så... Var det noen som ble noe klokere nå?
ØE