Hi all,
I've just put together a 2-way OB speaker with 2xAlpha15a + Fostex FR166En per side with some help from this thread: What fullrange for OB?
I've done a measurement on the woofers, they play up to about 250Hz (12dB/oct filter), when I measured from 1m I got a 3dB resonance between ~200-250Hz. But since I only have iPhone to measure the speakers the response aren't to accurate.
I've tried to burn/play in the woofers with 20Hz sinus tones with the woofer out of phase and I already here some improvements. So now I only has to burn in the FR aswell...
The crossover for the speaker are:
Alpha 15a: 4.7mH and 150uF (12dB/oct)
Fostex: 68uF and 3.9mH with L-pad -2.5dB
Must say it sound awesome! Even thou I going to tweak the crossover, the cabinet and much it looks really promising! My main task now is to lower the frame-vibrations, the FR vibrates to much at the moment. When I placed a "hifi mouse" (to suck up all vibrations) the sound improved alot.
what do you fellas think of the build so far? Any suggestions how to eliminate the vibrations?
Best regards
Mikael Hörnqvist
I've just put together a 2-way OB speaker with 2xAlpha15a + Fostex FR166En per side with some help from this thread: What fullrange for OB?
I've done a measurement on the woofers, they play up to about 250Hz (12dB/oct filter), when I measured from 1m I got a 3dB resonance between ~200-250Hz. But since I only have iPhone to measure the speakers the response aren't to accurate.
I've tried to burn/play in the woofers with 20Hz sinus tones with the woofer out of phase and I already here some improvements. So now I only has to burn in the FR aswell...
The crossover for the speaker are:
Alpha 15a: 4.7mH and 150uF (12dB/oct)
Fostex: 68uF and 3.9mH with L-pad -2.5dB
Must say it sound awesome! Even thou I going to tweak the crossover, the cabinet and much it looks really promising! My main task now is to lower the frame-vibrations, the FR vibrates to much at the moment. When I placed a "hifi mouse" (to suck up all vibrations) the sound improved alot.
what do you fellas think of the build so far? Any suggestions how to eliminate the vibrations?
Best regards
Mikael Hörnqvist
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