box building help

[expo5.0]

hey that would be good news to me it would simplify my life to be able to make my box a little smaller. what size box did you have with your hx2?

according to my manual (they got here today) the same size box is recommended for both the hx2 and the he2. just fyi- my last drawings have the overall size per sub at about 2.78 cubic feet and i would have added a little fill from there.

it comes down to this- i want these to pound and i know they have the inherent propensity to pound pretty damn hard. do i want to optimize the 'aggressiveness' of their bass (like a 2.5 cubc foot each: q>1) or do i want to sort of temper it for easier listening and a more linear response because even tempered they will still pound more than enough (q<.9).


as for the rear door speakers- i'm thinking about leaving them in the doors, or moving them to a small enclosure built for them facing forward in my amp rack or a combination of both run off of the same channels of my amp.

my box design (the amp rack actually) has a nice slope that would allow speakers to be mounted 18 inches behind the heads of the rear passengers facing forward.

 

[davesexplorer]

^^^ how you want them to hit is up to you.... although if you mainly listen to rap, why do ya need "easier listening"....

I had my 15 in a 2.4 ft3 box for a while for SQL and it hit and sounded pretty good.

 

[brendan]

just remember, saying my 15" was in a 2.4cuft box and trying to compare this to another 15" in a 2.4cuft box is like comparing apples and oranges if they're a different brand, or even model subwoofer. Unless they happen to have the same T/S params, they're gonna behave differently.

 

[expo5.0]

can i also add these in kickpanel and run them off of my 500a2- it makes 125 watts by 2 at 4 ohms, would these sound as awesome as i think?


mb quart
6.5" 2-Way REFERENCE Coaxial Speakers
Impedance
4 Ohms

Frequency Response
40-32k

Sensitivity
86dB

Power Range
60-130Watts

Crossover Frequency
3700Hz

 

[davesexplorer]

I think those Quarts will sound awesome....

 

[Beastb15]

Why exactly do you want a sealed box for rap? That makes no sense. The box type you want all depends on the output desired. It is so easy to make a ported box sound extremely good. A small vented box tuned anywhere from 24-30hz will sound extremely good...not to mention your low bass notes will be much better. I would not recommend tuning to 35-40 hz(to whoever said that) unless you basically just want it to be loud and not so much SQ. My box is tuned to 34hz...and its fairly sloppy, but i just like it loud...and I still do fairly well in comps. I am building a new box for comps though tuned to 43 hz, but thats besides the point.

Yes its true that you *theoretically* get 3 db by adding a sub or doubling the power...but that doesn't always necessarily occur, all depends on vehicle and install. Even though you get "3db" with another sub...you can get upwards of 5db just by adding a ported box.

Once again...I have a ported box, used to have sealed, and will never again have anything other than vented. Its sounds great and makes it louder.

 

[expo5.0]

well the specifics of the woofer have a lot to do with whether a vented or sealed enclosure will perform better. i'll admit that i'm sort of a newbie on the fine tuning design of sub boxes etc., but what i've found time and time again (using different calculators such as blaubox, and win whatever as well as asking other people with experience) is that these subs won't hit that much harder with a vented enclosure. most likely they would only be a couple of dbs louder so thats why i decided to just go with sealed.

of course i like to listen to rap and thats primarily what i'm building it for. my conclusion has just been that the little output i lose won't matter since it will still be plenty loud and the benefits will be nice. it will be easier to build, and the overall sound quality will be nicer. i know someone will come back and say "well a vented enclosure can sound great if you build it right"- but a vented enclosure that is built for sound quality won't have as much spl as one built for spl and essentially will be the same as a sealed box output wise.


at this point here is the plan- sealed 2.68 cubic feet per woofer. 500a2 powering mbquart 6.5s and audiobahns in the front. four channel powering 5 by 7s in the rear doors and the other two channels of the 4 channel powering an 8 inch woofer in a custom center console (later in the summer).

now i just need to get started and start taking some pictures so ya'll believe me.

 

[Beastb15]

Originally posted by expo5.0
is that these subs won't hit that much harder with a vented enclosure. most likely they would only be a couple of dbs louder so thats why i decided to just go with sealed.

no matter how much advice you get, learning by doing is usually the best method. Do you realize what a "couple dbs" is? 3 dbs is mathematically twice as loud. so by making your box ported, you have done the same as doubling the power, or the subs.

of course i like to listen to rap and thats primarily what i'm building it for. my conclusion has just been that the little output i lose won't matter since it will still be plenty loud and the benefits will be nice. it will be easier to build, and the overall sound quality will be nicer. i know someone will come back and say "well a vented enclosure can sound great if you build it right"- but a vented enclosure that is built for sound quality won't have as much spl as one built for spl and essentially will be the same as a sealed box output wise.

your theory sounds nice, but isn't true. Obviously an SQ box will have a considerable less amount of output than an SPL box, anyone could tell that. But...regardless, adding that little power still gives you more output, and a noticeable output at that. So saying that it would be the same as a sealed box output wise is incredible off base.

Just thought I would clear those two things up.