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Multi-Way Conventional loudspeakers with crossovers

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Old 25th February 2010, 08:50 AM   #1
el`Ol is offline el`Ol  Germany
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Join Date: May 2005
Location: Bavarian Forest
Default M-dipoles

Hello all!

In the latest Klang+Ton, a German DIY magazine, there is dipole speaker with an M-dipole. This is how something like this looks like:
Dipol-Bass mit Visaton W 250 für FAST Systeme, Lautsprecher - HIFI-FORUM
It is 38x38x76 cm, drivers are two Peerless SLS 12. It runs from 30 Hz to 200 Hz without correction, just a 12 dB lowpass filter and without sensitivity loss.

My question:
Why is the usual dipole bass two pro drivers on a flat baffle with EQ and a 1000 W amp?
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Old 25th February 2010, 09:12 AM   #2
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That Visaton thing does have dipole correction and EQ:
"Erkennbar ist die Anpassung der Filterkurve an den Resonanzbuckel bis 400 Hz. Bei einer steilflankigen Trennung bei 300 Hz oder niedriger wird der Resonanzbuckel ausreichend kompensiert. Ab 200 Hz setzt zu niedrigeren Frequenzen ein 6 dB/Oktave-Tiefpass ein, der den Dipolabfall im Fernfeld kompensiert."

It says there is dipole EQ compensation below 200 Hz and EQ to kill the peak at 400 Hz, in addition to a 300 Hz low-pass.

I haven't read that Klang+Ton article though, but it will be a surprise to see a dipole sub without any EQ!
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