Vifa, extra lines in response curve graph?

Layberinthius · 31st March 2004, 10:31 AM

This is the MG10SD09-04 from Vifa

Could anyone tell me what the extra lines are for?

Different ohmage? I need an answer so I can make a good descision on purchasing..

If anyone would like to tell me the best Vifa bass/mid/tweeter drivers out there for a 3-way I'd be much appreciated

JensRasmussen · 31st March 2004, 10:38 AM

Hello,

My guess is (From the top down):

Blue: On axis response
Green: 30 degrees off axis
Red: 60 degrees off axis

Blue: impedanse magnitude free air

Hope it helps

\Jens

Frank Berry · 31st March 2004, 10:39 AM

This is a short description of the measuring methods used at vifa/scan-speak.

FREQUENCY RESPONSE
The frequency response curves are measured in one of vifa/scan-speaks anechoic chambers.
The chambers are 6x7x8 meters which gives a lower cut-off frequency at 100 Hz.
The curves are measured in 0°, 30° and 60° with microphones in a distance of 1 meter. The input voltage is 2.83 V.
One of the walls in the anechoic chamber is without damping material and acts like an infinite baffle (2-pi room) for the driver. Behind the driver is a closed box - typically at 320 litres.

Layberinthius · 31st March 2004, 10:48 AM

Thank you!

Is there a 'king' crossover design which works well with a midrange efficient cabinet???

I /can/ buy the components for crossovers and make it myself, however buying outright /is/ easier and if I was to buy components myself I will still need a design to follow :\

I've heared vented designs are mostly for High Fidelity.

Is there any tried and true method with Vifa drivers and vented 3-Way designs????

31st March 2004, 10:38 AM	#2
JensRasmussen diyAudio Member Join Date: Jul 2002 Location: Denmark - Jutland	Lines Hello, My guess is (From the top down): Blue: On axis response Green: 30 degrees off axis Red: 60 degrees off axis Blue: impedanse magnitude free air Hope it helps \Jens

31st March 2004, 10:39 AM	#3
Frank Berry diyAudio Member Join Date: Sep 2003 Location: Midland, Michigan	This is a short description of the measuring methods used at vifa/scan-speak. FREQUENCY RESPONSE The frequency response curves are measured in one of vifa/scan-speaks anechoic chambers. The chambers are 6x7x8 meters which gives a lower cut-off frequency at 100 Hz. The curves are measured in 0°, 30° and 60° with microphones in a distance of 1 meter. The input voltage is 2.83 V. One of the walls in the anechoic chamber is without damping material and acts like an infinite baffle (2-pi room) for the driver. Behind the driver is a closed box - typically at 320 litres. __________________ Frank

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31st March 2004, 10:48 AM	#4
Layberinthius diyAudio Member Join Date: Jan 2004 Location: nowhere	Thank you! Is there a 'king' crossover design which works well with a midrange efficient cabinet??? I /can/ buy the components for crossovers and make it myself, however buying outright /is/ easier and if I was to buy components myself I will still need a design to follow :\ I've heared vented designs are mostly for High Fidelity. Is there any tried and true method with Vifa drivers and vented 3-Way designs????

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