i have been reading about how important tuning your ported box to the right level for your sub is. i am going to go with a sealed box though, what hz level are sealed box and are they more efficient than a ported box tuned to the right amount?
Post Number: 1516 Registered: Jun-04 Posted on Saturday, April 23, 2005 - 02:54 pm:
-------------------------------------------------------------------------------- if it was me for really nice sq ported id do 3.32 cf and drop the sub in and port the box to 26 hz
sean Gold Member Username: Insearchofbass
Post Number: 1517 Registered: Jun-04 Posted on Saturday, April 23, 2005 - 03:33 pm:
-------------------------------------------------------------------------------- 22 deep x 19.5 wide 13.5 high internal with one 8.75 high x 2.5 wide slot port the the depth of your box is the port depth....external measurements are 23.5 x 21 x 15 using 3/4 mdf board....your port will be tuned to 26 hz
wait maybe im not understanding but above you said 3.32 cu.ft. ported which i think is a little big for an Atlas, then in you last post you said 1.46 cf. sealed. i have always heard sealed (esp. for Atlas) sounds better, im afraid if i get a 3.32 cf. ported i will lose the sq.
No this is for personal use everyday driver. Im looking for overall SQ and SPL mix. Just wasnt sure exactly what a good tune whould be ported.. Alot of people say sealed but what is a good port tune that will be more efficant then sealed and hit all the notes just as good with more efficiancy and depth.
HEre what one guy posted. i'd go 4 cubes net tuned to 22hz or so if you want to go ported. My box was 3.5 tuned to 28hz but thats too high of a tune for this sub IMO. From plotting it on many box programs its way too peaky which explains why i had to EQ down 40hz ridiculous amounts lol, and the f3 is like 38hz or something in that box. Slightly larger (4 cubes net) with 22hz tune plots beautifully. But with cabin gain you'll end up with a TON of low end to the point you would need to run some heavy midbass speakers ~60hz hp to blend well. So IMO might as well seal it if you are more interested in music rather than SPL in the deep end. You will get a much better blend into your front stage. And in all honesty 20-35hz in this box (my sealed box) is already REALLY LOUD so for music porting this sub wouldn't do anything for you because you'd have to cut out all your gains in the low end to sound natural.
why don't you plot it in some box building programs and see the nasty peak from 40hz-50hz and an f3 of like 38hz in a 3.5 cube box tuned to 28hz like mine. I had to drop about 18db at 40hz in my car to get it to sound natural. Low low end was non existent without EQ because 45hz was so loud that i couldn't even hear or feel 30-35hz. With sealed my low end below 40hz is MUCH MUCH better that just goes to show that tune is too high All subs are different, some subs, like say an E12a can go in a small box tuned to say 28hz and still have GOBS of low end. Some subs like the Temptest and Avalanche need to be tuned low if you want anything resembling music in your car.
I own the sub so i should know, i really need to discuss the recommended ported enclosure specs with chad because i think he needs to recommend a lower tune at least 24-25hz. And a tad larger box around 4 cubes.
All the box builder programs i've plotted say 4-4.5 cubes tuned to 18-22hz for the avalanche. All of them recommend sealed over ported for it too.
One thing i will say is the this is one of the loudest subs i've had in a sealed box, VERY efficient and VERY loud for being sealed using way less than 1000w. It has so much low end sealed you'd think it was ported already! It models up extremely close to the brahma, and even more low end than the XXX in the recommended boxes. brahma 15" actually needs an even bigger box for .7 QTC but i like low QTC ~.6 for best possible transient response.
we're not talking about box size we are talking about tuning frequency. I think the fs of the avalanche is 15hz if i'm not mistaken which is the main reason low tuning is necessary. I wouldn't just say this if i hadn't heard it for myself. At first i was like eh wtf? And then i plotted it on my programs and sure enough, exactly what i heard a HUUUUUUUUUUUUUUGE lump at 45hz i'm talking like HUGE peak and then an f3 of 38hz or something which is ridiculously high considering its ported. My sealed box has an f3 (without cabin gain) of like 32hz.
I've never even considered tuning any sub i've had below 26hz before, normally i tune around 28-30hz. Its only with this sub that i've found it neccessary. i just don't want to see a bunch of people buying avalanches throwing them in these boxes and then being dissappointed with their SQ. I'm trying to help here, not argue.
Sean, we had this discussion about the Avalanche not too long ago. You're thinking the same thing I did, that low 20s typically aren't needed. After looking at the specs of the sub, you'll see why, though. That sub is designed with a VERY loose suspension and not exactly ideal in a ported box. Funny we thought the same thing
dbbass, sealed boxes aren't exactly "tuned", they have a resonant frequency, though. The system resonant frequency will depends on the box size, but with a typical .707Q, it will resonate in the 50hz region or so, of course this varies by a large amount depending on the subwoofer used.
damn i just got on hotmail and had like 62 messages from this thread. so i think i am just going to go with a sealed box. subfanatic said above (way above) that a sealed box for an Atlas would be tuned to like 15hz, with this will the sub be able to hit almost any note and sound good?
The frequency won't be 15hz, that is the resonant frequency of the subwoofer in free air, the frequency changes when in an enclosure. The resonant frequency of that sub in, say, a 3.5 cu ft enclosure will be around 40hz for that sub. Yes, it will handle the entire sub frequency range very well sealed.
Mo, sealed you will hit closest to the resonant frequency of the cabin due to a flat response above around 40hz. Ported, that will depend on the cabin gain, but you'll likely still hit the loudest higher up due to the low tune of the box. Basically you can expect similar results with both since you'd have a low tuned ported, you'll just get more output down low with a ported box.
ok so just one more question. what do you recommend for a sealed enclosure size. the website has 3 choices and i think im going for the middle size (1.15 cuft). is that a good sealed size or should i go bigger?