Subwoofer locations without losing the spare tire

2fast4thelaw

Without further argument on that subject, I have said this before and I will say it again. Sound quality is very subjective.

Here is a perfect example, some people swear by 10" subs, personally I have never been happy with a 10" sub and always find myself upgrading to a 12 and recently I have been playing with 13's and I think they are the shiznick!

This is off topic big time, but I will say it anyway to reinforce my point.

I have a home theater sub with an 18" driver in it and it hits tighter than any 8, 10, or 12 I have ever heard. In fact its the Home Theater sub that all others are measured by, at least at the time I bought it. Granted it has a 3000watt amp and cost a few grand, but its an example that very large sub drivers can have the SQ that rivals smaller ones.

Be careful when you generalize as there are always exceptions to the rule.

bigaudiofanat

Agree to disagree.

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2fast4thelaw

No problem Matt, i am not trying to put down your opinion in anyway. I just dont like it when people generalize. People who generalize are usually ignorant. You are not ignorant and are clearly an intelligent person who knows a lot about this subject.

bigaudiofanat

Thank you you seem to know a bit yourself as well.

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huff442

Question for 2fast4thelaw. Your subwoofer enclosure design intrigues me. I'm not familiar with the boundary loaded concept in a car sub. Is this similar in design to the super high output PA systems? Regardless, how did you determine the volume of the chamber in front of the speaker? What about the size off the slot opening?

2fast4thelaw

The design is heavily influenced by High Output PA speaker design. The driver is angled slightly to horn load it to disperse bass energy. I will give a little tutorial on Boundary loading and Transfer Function and how they relate.

First off everyone knows that a subwoofer placed in a corner increases its output. This is because it has more boundaries to bounce off from. The more boundaries you can create, the more bass energy can be generated. In my enclosure the sub fires directly into the floor of the vehicle and bass is forces through a small chamber with a large vent at the very rear of the car. In a since this is a bandpass enclosure but the front chamber is not calculated to produce a specific frequency.

Transfer Function is maximizing the length of your bass wave from the subwoofer to you. In my enclosure the bass wave hits the very back of the car and bounces off of the rear window which then reflects it to the windshield which then reflects back to you.

Also Matt (BigAudioFanat) pointed out something I didn’t even think of. The downfireing driver transmits energy through the floor of the car so you get a lot of tactile feel. I feel this sub more than I can hear it. It feels like its right under my seat.

Here is a good link to illustrate what I am talking about.

Measuring Transfer Function, Boundary Loading & Soundwaves

huff442

Very interesting. Do the smaller boxes on either side of the speaker chamber add a significant amount of volume to the total enclosure volume?

How long till we see these enclosures (or at least plans) for sale? This could tempt me to lose the spare and buy run-flats.

kannibul

Sorry, but I find a lot of humor in those two statements

huff442

I have to agree with the statement. But remember, ignorance doesn't mean stupid. It's a lack of information.

ConchZ2

I’m curious about your home theater sub. I’m currently using two SVS PC Ultra Plus subwoofers and looking to upgrade. Any suggestions?

2fast4thelaw

You have (2) of those and you want to upgrade??? Those are awesome subs, just one of them will keep up with my Velodyne FSR1800II if not exceed it.

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ConchZ2

Thanks…….someday I want subs that will sound like Jaco Pastorius, Flea, Getty Lee, John Paul Jones etc. are playing Live in my house!

antennahead

I have one of them and it rocks my large room!

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