OB quasar mkII - filter question(s)

oLjud · 29th May 2010, 05:09 PM

Hi all OB-fans!

I'm thinking about building the Quasar mkII, find the speaker very interesting (like the design alot!

) but I have some questions about how to solve the crossover issue I've got.

All configurations so far i've seen/read have used active filter for Alpha 15", but i currently not an owner of a activefilter.
So my question is: is it possible to build a passive filter for the speaker instead? Or will it be as expensive as to buy an active filter?

Any inputs?

Best regards
Mikael

jerome69 · 29th May 2010, 06:00 PM

Hi,

It is possible if you use the alpha 15. See MJK papers : OB Theory

Solid state amplifiers required.

Regards.

oLjud · 29th May 2010, 06:58 PM

Thanks for that link, had totally missed it.

Since he's only using 1 15" and I'm using 2 15" I should only lower the coil from 9mH to 4.5mH for same results, right?

best regards
Mikael

jerome69 · 29th May 2010, 08:09 PM

Yes the coil to 4.5mH and the capacitor to 2x68uF.

Regards.

oLjud · 29th May 2010, 08:12 PM

Thanks for the answer. Just had to double check

29th May 2010, 05:09 PM	#1
oLjud diyAudio Member Join Date: Apr 2010 Location: Örnsköldsvik	OB quasar mkII - filter question(s) Hi all OB-fans! I'm thinking about building the Quasar mkII, find the speaker very interesting (like the design alot! ) but I have some questions about how to solve the crossover issue I've got. All configurations so far i've seen/read have used active filter for Alpha 15", but i currently not an owner of a activefilter. So my question is: is it possible to build a passive filter for the speaker instead? Or will it be as expensive as to buy an active filter? Any inputs? Best regards Mikael

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29th May 2010, 06:00 PM	#2
jerome69 diyAudio Member Join Date: Feb 2008 Location: Lyon	Hi, It is possible if you use the alpha 15. See MJK papers : OB Theory Solid state amplifiers required. Regards.

29th May 2010, 06:58 PM	#3
oLjud diyAudio Member Join Date: Apr 2010 Location: Örnsköldsvik	Thanks for that link, had totally missed it. Since he's only using 1 15" and I'm using 2 15" I should only lower the coil from 9mH to 4.5mH for same results, right? best regards Mikael

29th May 2010, 08:09 PM	#4
jerome69 diyAudio Member Join Date: Feb 2008 Location: Lyon	Yes the coil to 4.5mH and the capacitor to 2x68uF. Regards.

29th May 2010, 08:12 PM	#5
oLjud diyAudio Member Join Date: Apr 2010 Location: Örnsköldsvik	Thanks for the answer. Just had to double check

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