hatchbacks

[Jay]

does anyone have a technical explination as to why if you have a system, be it two 12"s or whatever.. if your box is made to fire off the backglass in a hatch it seems like it's twice as loud as if it were in say the trunk of another type of vehicle?

[daveb91]

Long time ago someone told me the way the subs load off the hatch gives you like a 3 db gain. Nobody ever told me the reasoning behind it but I could here the same system in a trunk and hatch and the hatch was always louder.

[MnAiXsImMoA]

hatches are an ass load louder for so umknown reason i would like to know the explination for it to

[purehateedge]

i would just imagine something about the sound waves bouncing off of the glass and coming right into the main car compartment whereas on a coupe, theres a seat and stuff blocking the sound waves.

[m pwrd 3]

Imagine a large bandpass box. Then imagine a hatch. Pretty much same thing only bigger.

[m pwrd 3]

Here is somewhat of an explaination as to how bandpass boxes work.

Bandpass Enclosures
This type of enclosure consists of two enclosure sections. The first section is a sealed and the second section is ported. The woofer is loaded into the sealed side and then the front of the cone is firing into the ported side. This design is called "Bandpass" because it will only reproduce certain bass frequencies |within a narrow section of the audio band. The advantages of this type of enclosure are very high efficiency and steeper filtering of unwanted midrange frequencies. Bandpass boxes can produce awesome amounts of bass with very little amplifier power. But there is a price to pay for this efficiency. Bandpass boxes tend to produce "one-note," somewhat "boomy" bass and are large. People who like to listen to Bass CDs tend to like bandpass boxes. They are also a good choice in systems where another woofer handles the mid-bass chores and the bandpass is needed only for reproducing the very lowest bass range. Even though they are ported, bandpass boxes have low Vent Air Velocity and can play very loud without excessive port noise.

[Racerx300zx]

another negative to bandpass boxes are most of them drown out the crackling noise your speaker makes to let you know it's time to turn down the volume, bandpass boxes also need to be made vvvverrrrrrrry precisely.

[Jay]

hmm.. well yes and no
you can fold the rear seat down an have the subs firing off the trunklid an it would be the same thing.. its still loading, but when you load it aginst the glass its just dif.


as far as your car becoming part of the "box" here's a perfect example

i had two 15w4's in the bed of my S10, instead of the whole cab/bed bein cutout there was about a 12" x 24" hole, that was the "port" for the bandpass box.. Scott from Audiocrafters called JL an they worked up specs for the box it would take to make the cab of my S10 act as the front part of the bandpass box. I forget how big the actual box ended up bein.. it took up allmost 1/2 my bed tho. that thing would pound.. it broke welds in the roof, bed, cracked the bondo on my tailgate filler, screwed up all kinds of stuff.. it was great lol. imagine what it was prob doin to my ears

[Jay]

dood it rattled like hell..
i dynamatted like everything, used that spray sound deadening stuf to do the whole underside of the bed too. but it just broke like everything loose.. it got to the point where you didnt wana turn it up unless you were on like the interstate cause it sounded like the truck was gona fall apart when you did

[sweeteffx]

I did something similar in an old Mitsu Mighty Max, I cut a 25x12 hole in the back of hte cab and the front of the bed. I made a box that took up the entire width and all the way back to the front of the fender wells in the bed. I only had 2 10's though. But it it hard! when you shut the doors you didnt hear a thing but boy when you open the doors you could feel your nuts shudder.

[Jay]

yea, but my box and cut-thru size in the bed/cab was all designed by JL
big dif there...

[ramrod]

lol things like that make me wish i had a truck lol. When i had my t-bird i made 2 seperate ported boxes for my kickers. they were modified version of the street bump boxes made to kicker specs, omg i loved it. Listening to a little jon song like throw it up my friends and iwould somtimes sit in my car with it cranked jsut waiting for the bass note to kick in, mmmm sweet bassy goodness. All in all both boxes measure 30.5in deep,16.75in. wide, and 14.75 in. high. The ports measure 14.5in. in depth and 4.375 wide. tuned to 28htz

[RobbieNelson]

pics of "square" speakers... kickers I think

I'm surprised at how many people sucome to this gimmick. The cone shape of a traditional speaker is far superior as far as rigidity is concerned. I don't even like shapes formed into the cone. Anyone wanna take a stab at "square" speaker theory??? :lol:

BTW... I agree with Jay about the box dimensions of bandpass boxes and even ported boxes for that matter. If you wanna get a nice flat curve, you're better off to build a nice big sealed enclosure. Then again some people just like the BASSSSSSS. :dunno:

[ramrod]

Guess my understanding of the square theroy was basically whats been pumped into my head. Cone speaker next to square speaker and u can tell a difference in the amount of air pushed, but then again if this was completly true, every spl competitor would be running square speakers right? So i dunno

[sweeteffx]

My box was built to infinity specs for my speakers actually even the port size.

[C_Note]

dood it rattled like hell..
i dynamatted like everything, used that spray sound deadening stuf to do the whole underside of the bed too. but it just broke like everything loose.. it got to the point where you didnt wana turn it up unless you were on like the interstate cause it sounded like the truck was gona fall apart when you did

There was a truck that ran around Marietta in 93/94 (when we could still hang out at Hills), I think it was maroon'ish, that had one of the floor-to-ceiling setups. Man, I only sat in that thing once, and honestly couldn't breathe due to the pressure building up inside the cab. When that guy would drive up Pike, the windows in BK would start flexing in and out