Agreed! However, once you get to a certain level it doesn't "really" matter. My (2)15's in my 89 Bronco were very tight subs that would reproduce just about anything i threw at 'em. And they were very loud outside of the car!! I think the fiberglass top may have helped a little! I miss those suckers!

 

sry i know a little but not a lot, but my thing was i have the audiobahn subs and they're dual voice coil and if i wire them up in the same coil then what ive understand is i get 4 ohm, if i use say the positive on one coil and negative on the other i go down to 2 ohms, i really dont understand the whole ohm thing and how it works, and what's the point of the ohms.. but does lower ohms mean louder or how does that work? thanks

 

Ok I wasn't thinking of dual voice coils. When you wire 2 resistors(speakers) in series you double the resistance and when you wire them in parrallel you half the resistance. So yes you would be providing the amp half the resistance BUT BUT BUT only if hte amp is 2ohm stable!!! **Note** If it is not you'll fry it!!** Just be aware.

V(volts) = I(current) x R(resistance/speaker)

This website will help.
http://www.grc.nasa.gov/WWW/K-12/Sam...w/ohmslaw.html

 

Guys...

Ported enclosures are not "louder", nor do they produce bass that "carries" farther outside the car. It's all a simple matter of the frequencies you wish to reproduce. A ported alignment will play lower frequencies than a sealed enclosure. The trade off is distortion and large cone movement (POTENTIAL DAMAGE) outside of the tuning range. THe "tuning range" is a rather narrow band of frequencies that the box is designed to play at. The lower you tune the box, the more tradoffs you make. At some point the box will play little more than a few frequencies very loud, but not anything else. Not very musical to say the least. A sealed enclsure is a more natural "roll off" of frequencies. In other words there are no large peaks in it's output. (Not good if you want that "peak" to play your "one note bass" rap tunes)

If you look at most competition (db drag) enclosures, they are band pass designs, engineered to play HIGH SPL over a very small range of frequencies. They don't sound good with most types of music.

NOw lets talk about the "music"...

enclosure choice will depend on your listining tastes. If you a RAP lover (one note bass) then by all means build yourself a ported or bandpass system....that plays low frequencies but not much else.

If you like the rest of the music in the world. Build a sealed enclosure for your vehicle. You will get several db of "cabin gain" anyway. The bass from a sealed box will thump pretty good in the small cabin of a truck. If you really want to play loud hard bass.... look into the brahma series of drivers from adire audio. They absolutely rock harder than anything else you will find.

Whatever the case.... EVERY enclosure has to be tuned (sized) to the speaker you purchase. Otherwise you are wasting your time and money and will potentially damage the driver by running it outside of it's designed parameters. Those guys who buy drivers and stuff em into premade ported or bandpass boxes are flushing money down the drain.

Bean

 

I've been carefully studying every post on this thread because I've recently built a small box that houses 2 6.5" drivers. It's in the testing stages (aka, not carpeted, not yet fully sealed, not properly wired) so it's hooked up to my home Pioneer reciever. I couldn't decide if I should seal the box or port it, but then a song came on the radio that made me decide sealed (it's somewhat sealed already) because the wall I was leaning on rattled at almost every bass rift in the song.

 

I have 3 10' subs (2 Rockford Fosgate, 1 JL Audio), I use 2 sealed wedges, and 1 sealed box in the middle of the floorboard. I just have to say I LOVE sealed boxes, I get very good bass with every type of music, and I can be heard about 1/2 a mile away

 

sealed should be more accurate.

 

You can see this article as to the Pro's and Con's

http://www.caraudiohelp.com/custom_c...udio_boxes.htm

 

The site Muffinman mentions is a very informative site it explains the pros and cons to each design and links to box building plans (although they are limited plans they can be a starting point)

 

Any Encloser design can sound good. I have seen and heared both Sealed, Ported, etc.. These designs did not stop at the box. They included High Cut Out Switchs to control them. The wiring in the systems had both Series and Parrallel they added resistors and coils to control ohms.

These systems are built to customer specs. and taste. One reason Manufactors have so many add-on products. The whole thing is a Art. If you add something to it make sure it matches or you could be reducing what your wanting out of it.

I once asked PM "Popular Machanics" what the best system was, And there reply was a Vacum Tube one built 10 years ago, But required a house to hold it.

 

I think its totally personal preferance, I love ported, have had nothing but good luck with them, build them myself with the rectangular slotted ports, and they sound great! Lots of math and equations to get the Frequency desired and to get the box to the perfect dimensions for the sub. So I think its totally up to the person its going for, the type of music they listen to, and how much bass they can handle!