Free Air

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illmattix

Member - Posts: 31

Joined: May 02, 2002

Location: United States

Posted: May 02, 2002 at 4:26 PM / IP Logged

I've noticed in a lot of magazines recently that people are starting to mount their subs in what looks to be a free air arrangement. Everything I've ever learned said that this doesn't work to well. Is the sub firing into a sealed enclosure or some other type of enclosure? How does this work?

Thanks

Matt James

NyxBass

Silver - Posts: 226

Joined: March 14, 2002

Location: United States

Posted: May 02, 2002 at 4:56 PM / IP Logged

You'd have to give us specific examples. Sometimes, a woffer will be mounted with the basket out, instead of in. I sounds the same, just makes mounting easier sometimes. That may be what you're seeing.

/NyxBass

the12volt

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Joined: March 07, 2002

Location: Louisiana, United States

Posted: May 02, 2002 at 5:00 PM / IP Logged

Hi Matt, what you might have seen are woofers mounted with the magnet structure facing out rather than the cone facing out. These could be in sealed or vented enclosures. The advantage is the ability to mount more woofers in a smaller or shallow enclosure where mounting depth is at a minimum. While they may look as if they are in a "free air arrangement", they aren't.

the12volt

illmattix

Member - Posts: 31

Joined: May 02, 2002

Location: United States

Posted: May 02, 2002 at 10:51 PM / IP Logged

Thanks for the replies. So if the magnet is mounted out, is the woofer firing into a sealed enclosure that's the same size that is recommended? Also, if this is the case, how does the sound get out? Is the speaker wired with reverse polarity?

Thanks

Matt James

NyxBass

Silver - Posts: 226

Joined: March 14, 2002

Location: United States

Posted: May 03, 2002 at 2:03 AM / IP Logged

The speaker is firing into a sealed, ported, bandpass, transmission line, etc. The sound gets out the same way it does from a normal box - If sealed, from the back of the cone mostly. From ported, from the back of the cone and the port. Bass is so omni-directional, it doesn't matter that the magnet structure is ion the way. The speaker is wired in normal polarity usually, but if it's in a multi woofer arrangement, it may be out of phase so it hits in the same phase as the rest. Phase should be determined by sound and which polarity you like better, not only instructions and labels.

/NyxBass

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Free Air

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