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View Full Version : Can I use VTF-3 MK2 as MBM?


walletjes
February 4th, 2008, 3:40 PM
I have a H.O w/ turbo in front, and a VTF-3 mk2 behind my couch and I was wondering if I should get a high pass crossover module and run the VTF-3 mk2 from 50-80hz as a mbm? I could then run the H.O. 50hz and below.

I know Dr. Hsu recommends this type of setup, but I am curious why is that better then running both subs 80hz and below?

Should the phase of each be opposite or the same?

Thanks.

bsoko
February 4th, 2008, 3:57 PM
It won't produce the same output as the MBM-12. I have done what you want to do with a 3.3 Turbo and a 15" Dayton sub and it was just barely OK. You have to understand that the MBM-12 was designed to operate from 50hz on up and outputs at the 50hz mark a solid 110 spl to 115. There are not too many subs out there that can match that.

Bill

walletjes
February 4th, 2008, 4:06 PM
How about a STF-1?
It has a smaller, lighter driver. I would guess it would be pretty good from 50-80hz.
If it is right behind me, why would I need high spl?
Also, why is it better to break up the freq. instead running both subs 80hz and below like I have been doing?
I wish I could hear a system with the MBM-12.

bsoko
February 4th, 2008, 7:18 PM
How about a STF-1?
It has a smaller, lighter driver. I would guess it would be pretty good from 50-80hz.
If it is right behind me, why would I need high spl?
Also, why is it better to break up the freq. instead running both subs 80hz and below like I have been doing?
I wish I could hear a system with the MBM-12.

If you live near me in Olympia, WA you can.

Bill

walletjes
February 4th, 2008, 8:13 PM
I live in the Chicago suburbs. Thanks anyway though.

walletjes
February 7th, 2008, 9:07 PM
I have a H.O w/ turbo in front, and a VTF-3 mk2 behind my couch and I was wondering if I should get a high pass crossover module and run the VTF-3 mk2 from 50-80hz as a mbm? I could then run the H.O. 50hz and below.

I know Dr. Hsu recommends this type of setup, but I am curious why is that better then running both subs 80hz and below?

Should the phase of each be opposite or the same?

Thanks.

Anyone?

Pete_Hsu
February 8th, 2008, 10:01 AM
You can certainly try doing that. The advantages in running one unit for mid-bass and one unit for deep bass is lower intermodulation distortion, and less chance for cancellation due to having two different subs handling the same frequencies while in two different locations. At the same time, you could also try using both subs to handle all the bass too in order to see if that sounds better to you. As for phase, you would only need to experiment with inverting the phase on one unit (say, VTF-3 Mk2).

walletjes
February 8th, 2008, 8:11 PM
Thanks Pete.
What do I need to order from you guys to high pass the VTF-3 MK2 at 50hz?

Would a smaller sub like a STF-1 be better for this application? (I have one in my other system).

bsoko
February 9th, 2008, 10:46 AM
Thanks Pete.
What do I need to order from you guys to high pass the VTF-3 MK2 at 50hz?

Would a smaller sub like a STF-1 be better for this application? (I have one in my other system).

Parts Express: FMOD Crossover Pair 50 Hz High Pass at http://www.partsexpress.com/pe/showdetl.cfm?&Partnumber=266-270. I have used this item in the past with another sub before I got my MBM-12.

Bill