posted
Im new to car audio and posted a question on another forum and somebody replied with a link and said to come check this box out.........I have a 2001 Chevy Blazer......I only have a single Fosgte Punch 360.2 amp....and i'm waiting for my Fosgate 12" HX2 2ohm dvc to arrive soon......while i wait, im trying to come up with box ideas that would give me as much SPL as i can get out of it..............alot of people told me to come and check out the boxes and the people that make them......i have a long history with wood working....so it wont be a problem to build the box......its just that im so new to car audio, i have no idea on what dimensions to make the box, or even what kind of box to make for my little system........do you think that my fosgate 360 amp and fosgate hx2 12" will be a good canidate for an ABC box..??? If you can help in anyway, i would really appreciate it... Thanx in advance.
posted
I really would like to read those articles but i just end up banging my head in your firewall, I use Norton internet security can that be an issue.I just bougth the Norton kit so i dont know it to well. any suggestion anyone.
sendt Buzz a pm about this
-------------------- Alpine CDA-7939R HU,2 pcs Alpine PRA-H400 signal prossessors. Rockford Fosgate 200DSM,2 pcs 400X4 and a 500M. Macrom/Morel 8,5" midbass,5" midrange and 1,12" tweeters up front. 6,5" midbass and 4" coax rear. Rockford Fosgate RFR 2215 in sealed box for sub.
posted
I want to build one for a single 12. HOw do I know how big to build it? I will use either a Vega 12 or a stroker 12, does it matter in that box?
-------------------- :::JMANN::: MY GARAGE! Cerwin-Vega! ~ HiFonics~ Pioneer ~ Alpine Posts: 2850 | From: South Euclid, Ohio (just outside of Cleveland) | Registered: Apr 2001
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posted
Alright i'm all set to redo my install (my last setup was robbed). I was going to do a dual reflex bandpass but after all these ABC praises i'm confused. Has anyone tried an the same sub dual reflex as well as ABC?? What were the differences?? I've heard the only thing ABC is better for compared to a ported box of the same size is cone control and one downfall is that there will be three impedance peaks). I'm thinking of going with 3 L7 10's in 6cu. ft. total tuned around 34Hz. Or putting them in a dual reflex bandpass.
One must remember that most subs in a huge ported box will be LOUD compared to a small-medium size ported box, i'm scared that everyone here thinks these things are so damn loud because of the size of the box. I'd really rather go ABC (will look better and will probably sound better). But i want whatever will be loudest.
One must remember that most subs in a huge ported box will be LOUD compared to a small-medium size ported box, i'm scared that everyone here thinks these things are so damn loud because of the size of the box. I'd really rather go ABC (will look better and will probably sound better). But i want whatever will be loudest.
BINGO!! except the smaller chamber of the ABC box really cleans up the sound of the upper bass frequencies....
also, another advantage of an ABC versus a 6th order bandpass, is that the cone of the sub is exposed (which also creates pressure).... where as the 6th order bandpass hides the sub's cone within the box, making just the ports (total area) do all of the work....
an ABC box will be somewhat smaller than a 6th order, with similar response "curves".... dont worry too much about the impedence curves either... things even out pretty well in the end.....
i cant say enough about these boxes.... they are definitely NOT something you'd use to compete in Sound Quality competition with (especially 25Hz @ 140+db), but NOT shabby by any means....
hope this helps,
-later
-------------------- - Wes Sowers - Discount Car Stereo L.L.C. Kent, Wa 98032 (206)824-5875
posted
But are they louder than a 6th order?? Have you ever tried the same sub both ABC and ported for the same net volume. Does it play equally as deep??
What about the same sub dual-reflex and ABC??
I'm even getting thinking of (just for fun) trying a triple reflex bandpass (ie. rather than having the rear chamber being just a simple ported box it will be ABC and the front chamber will be a simple ported box with the sub in the middle). In theory it should work.
quote:Originally posted by Solobaric4life: But are they louder than a 6th order?? Have you ever tried the same sub both ABC and ported for the same net volume. Does it play equally as deep??
What about the same sub dual-reflex and ABC??
I'm even getting thinking of (just for fun) trying a triple reflex bandpass (ie. rather than having the rear chamber being just a simple ported box it will be ABC and the front chamber will be a simple ported box with the sub in the middle). In theory it should work.
i would not be accurate by stating which box is louder than the other....
BUT, i can tell you that a 6 total cubic foot ABC box will have higher peaks in frequency response than a 6 total cubic foot 6th order bandpass...
its all because the ABC uses both chambers simultaneously, where the 6th order can only opperate out of 1 or the other.... generally speaking the ABC hits lower and deeper, when compared to a similar sized 6th order design....
i suppose a tripple box design might be possible, if you dont loose too much in the "Sound Quality" department.... i think in this type of box you might experience very slow transients between notes (too many obstacles).... you get mad propps if you pull that one off.
also, i feel that because the subs cone is exposed (not the case with other bandpass designs), the addition of the sub cone moving air inside the cabin/room, will naturally be more efficient.
-later
-------------------- - Wes Sowers - Discount Car Stereo L.L.C. Kent, Wa 98032 (206)824-5875
posted
I would like to build one for two rf 10's how would I use a box program like winisd or box pro,term pak or scex box builder? would i put in the total of let's say the 15" that dukk talked about would be 4.5 cf in the program? them set it for two ports and get the port sizes. then just devide the box 2to1 with a port the same size in the devider?
Posts: 17 | From: crowley,L.A. | Registered: Oct 2001
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quote:Originally posted by earthquake2020: them set it for two ports and get the port sizes. then just devide the box 2to1 with a port the same size in the devider?
exactly
-------------------- - Wes Sowers - Discount Car Stereo L.L.C. Kent, Wa 98032 (206)824-5875
posted
I'm curious as to what would happen if you played with the volume ratios and ports a bit to get narrower bandwiths/more SPL or wider bandwiths/less SPL. I've heard that ABC's work alot like a 6th order bandpass (dual-reflex bandpass) and since you can play with them i'd think you could play with these.
Also is the out put at the lower tuning identical to a large ported box?? I don't see how it would be since there would be equal output from the port in the large chamber and the port joining the two chambers. Ie. for the sound to get out of the smaller chamber the air would have to travel through twice as much port as the air escaping from the first chamber.
quote:Originally posted by Solobaric4life: I'm curious as to what would happen if you played with the volume ratios and ports a bit to get narrower bandwiths/more SPL or wider bandwiths/less SPL. I've heard that ABC's work alot like a 6th order bandpass (dual-reflex bandpass) and since you can play with them i'd think you could play with these.
yes im sure you could change it slightly, just like a 6th order. although i've never really tried to mess with different volumes in each chamber.... however i've found that going just by the rules usually yields a very good mix.... i feel that total box size has more importance, than individual chamber size... u follow? (i.e. how does your sub perform/behave in different size boxes?)
quote:Also is the out put at the lower tuning identical to a large ported box?? I don't see how it would be since there would be equal output from the port in the large chamber and the port joining the two chambers. Ie. for the sound to get out of the smaller chamber the air would have to travel through twice as much port as the air escaping from the first chamber.
keep in mind that the sub is actually mounted in one of the chambers, which also happens to have one of the ports already in it. so, on the low notes, the pressure has to go through the middle port, then out the port in the smaller chamber (not 'double pressure' through the middle port).
on the low notes, output is absolutely OBSCENE! the upper notes can be quite crisp, and can also be very loud...
hope this helps,
-Later
-------------------- - Wes Sowers - Discount Car Stereo L.L.C. Kent, Wa 98032 (206)824-5875
posted
So would you say that for a given sub the output around tuning of that sub in a large ported box would not be as loud as in an ABC box of that same size. In other words at low freq. (ie. below or close to tuning) the sub would not act as if it's in a big ported box but instead a box that will make your windows flex?? I don't think I was very clear, let me know if you know what i'm saying.
Posts: 164 | From: USA/Canada | Registered: Feb 2001
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posted
yeah, it acts just like a HUGE ported box, because it is a big ported box
if you were to take the divider board out, and play just low frequencies, it would be about the same as with the divider board in.... the divider board simply allows the sub to use the smaller chamber on the upper bass notes....
where as that large ported box would not have have the luxury of the smaller chamber, and would sound like @$$ on the upper bass notes....
if you go TOO big of a box, there will be an excursion "gap" between the 2 tuned frequencies, and you will experience bottoming between the 2 tuned frequencies.... if the ABC box is too small, it wont function properly, and wont get very loud (this is when you'll want to do regular ported)....
hope this clears it up a little,
-later
[ 01-14-2002: Message edited by: MrFlamboyant ]
-------------------- - Wes Sowers - Discount Car Stereo L.L.C. Kent, Wa 98032 (206)824-5875
posted
Will you lose output over a regular ported box if the enclosure is too small?? At what point is the enclousure too small??
Posts: 164 | From: USA/Canada | Registered: Feb 2001
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