LaZyLuke

iTrader: (2)

Hi. I have made a custom box for the sw8200... its about 2-2.5 cuft... after the displacement... I am not sure if I did something wrong but the sub pounds on low frequencies... shakes everything... but on higher Fq it doesnt put up much- I can set the settings on the amps so it will push the sub harder on the higher fq but im not sure if its good for it... I read that this driver needs big boxes and so 3 cu ft was recommended... My understanding of size is - bigger lower fq , smaller higher fq... now I know the box is definitely not too big so whats wrong? ... basically I need some theoretical and maybe practical help with tuning this driver... im located in Guelph and visiting Brantford every 2nd weekend... If anyone can meet up and tell me what I should do to improve it please let me know.... or even msg me here... or reply to this post... anything really...

jalat

iTrader: (6)

To start, what did you tune the enclosure to? Any blueprints of the enclosure you made? You also have to rememeber that a subwoofer is made to take care of low frequencies, so dont expect that a 50+hz note is gonna rumble like a 35hz note will

LaZyLuke

iTrader: (2)

ok well... enclosure is sealed... so the only tuning i did was made it as big as possible.. I used fiberglass for custom shape of the front of the box that's why i know the rough volume (I know its bigger then 2cuft cuz that was the rectangular part of the box(2.0cu ft)... the curvy part can have up to .7 cu ft.... I was aware of the sub is for low fq's but its seems to be mostly subsonic... (I am planing on putting 8 inch inside the cabin to take care of the 100-50hz next summer).... but the driver plays 30 and lower right now so i think i messed something up.... also I am using a jl 500/1 currently, which seems to be more then enough for it (driver rated at 670rms- i was surprised that 500/1 pushed it to the limit), and that's why i'm selling the 1000/1 now that ive been saving for good few months...

jalat

iTrader: (6)

correctly if i'm wrong but is this a 12" driver? if so, thats wayyyy to large for a sealed enclosure. you should go no larger than 1.5 cubic feet sealed. Due to its larger cubic footage, you allow the driver to reach such low frequencies, but yeild its power handling

LaZyLuke

iTrader: (2)

Ok... yes it is a 12inch... then why the hell people recommended 3cu ft + last time I asked on here.... grrr... well better too big then too small.... I can't find specs for sealed enclosure for this guy anywhere, do you happen to know how I can get them? the sub only came with a warranty card and no specs sheet so I have no clue what im working with ;/... again its a SW8200 Eclipse driver.... and thank you jalat for quick responses...

jalat

iTrader: (6)

Fs 22.792E+00 Hz Free air resonance
Qms 4.262E+00 Q mechanical
Vas 81.385E-03 m^3 Suspension compliance
Cms 223.135E-06 m/N 1/(suspension stiffness)
Mms 218.523E-03 kg Moving mass
Rms 7.343E+00 kg/s Mechanical resistance
Xmax ** 0.000E+00 m Maximum acoustic linear motion
Xmech** 0.000E+00 m Mechanical displacement
Dia 254.000E-03 m Piston diameter
Sd 50.671E-03 m^2 Piston area
Vd ** 0.000E+00 m^3 Displacement volume
--- electrical ---
Qes 770.670E-03 Q electrical
Re 2.855E+00 ohms Voice coil DC resistance
Le 1.062E-03 Henries Inductance @1 kHz
Z 8.971E+00 ohms Impedance @1 kHz
BL 10.766E+00 Tm Motor force - Newtons/Amp
Pe ** 0.000E+00 W Max Electrical Power


So in english, this sub is more suited for a home theatre use. You were correct in making an enclosure as large as you did. Your deffinatly not going to get much more out of you "higher freq." region with specs like that.

My suggestion is to possibly try a bit smaller of a sealed enclosure, maybe around the 1.5 cubic foot sealed region, and sell whether it helps.

LaZyLuke

iTrader: (2)

ok... I may try that....I was also thinking about filling the box with polly fill... I did it before but it just made the driver more "crisp" and it could handle much more power... you think that may help here?... I dont want it to hurl at 50+ but at least hit 40-50 so i can work with the 8 inch( or 3 of them lol) inside the cabin (that was the original plan)

p.s./ I have two of the guys- and my plan was using one indoors... what will be a good enclosure for it at home? I am not sure if the formulas will work here for "normal" sub woofers...

Lord Huggington

iTrader: (1)

I had 3 of these beast subs (still have 1), and I know what you mean, it's like the only thing you hear is "rattle-bass", not exactly a warm sound, and it's because it's in a sealed box and designed for one, wait for the loooows. They are made for the lowest octave reproduction (15-30hz) like you said, and they do it better than any other driver I've heard (not that many). In any box I used, 20hz was always louder than 30-40hz (1, 1.2, 1.5 cubes). I emailed Eclipse tech and was told that 1.75 cubes gives a tune of 30hz for the 12" and the displacement of the sub is .12 cubes, I'm still wondering about the 10". If your box is around 2.4 cubes after displacement than you've tuned into the low 20's, so anything after 35hz is minimal, play some tones in a smaller box and you'll notice 50hz trails off, while it gets pretty loud at 30-40hz, than it completely destroys your car at 25hz. These subs don't have much high end, I was unhappy with their **** at 45hz in 1.2 cubes, but it's flat for the most part. In my sunfire I used a 2.2 cube slot port box with 750W and it wasn't much quieter than my XXX 12 on 1500W, and it was fine. The only reason they don't reccommend a ported box is because the cone is easily controlled by other factors (light cone = 38mm xmax, I reckon) but I really didn't notice over excursion, you wouldn't hear it with low distortion anyways. After hearing it in a ported box you'll see how warm sounding it is, it sounded better (warmer, XXX sounds neutral) than my XXX although that wasn't in the best box possible. I think what the designers wanted was to produce amazing low end response in a SMALL 1 cubic foot box, that way it's "tuned" to around 40hz, and you don't lose the bottom end like you would in a 35-40hz ported box. I had 2 SW8200's in 1.2 cubes each on maybe 750w and when the lows hit, it shook the car more at that lower frequency than my XXX did at it's peak, it's a low end monster, so, you CAN use it in a 1 cube box and have great low end, OR, you can give it even more space and let that low end shine, it's too bad they don't recommend a box that'll show you it's full output potential. If you are unhappy with it than double the cone area, use around 1.5 cubes/sealed each with 750W, you'll have low end that can't be touched!

LaZyLuke

iTrader: (2)

hmmm ... ok I will have to experiment with it during some breaks... I have a 1.19cu ft box at home so I can just put it in there and see what happens I guess... and I do enjoy the lows it throws... I only have one in the car but shakes the siding on houses I park my car at lol.... cant imagine what it will do inside the house .... anyhow... thanks for the responses... I will have to experiment with it some more using the information i got here from you guys...

as during the winter time (not much time to play around as of school) can I safely play the sub at higher freq in the box I currently have? (I can set the cd deck to "loud" with minimum bass, and the jl center freq to 40 and it actually puts out somewhat of an audible freq :], I just dont want to wreck the sub.....

Lord Huggington

iTrader: (1)

I've also used 2 SW82's for HT with a plate amp that has a switch to change it's output at 14hz, 25?hz, 33hz?. Straightforeward, 33hz is loudest, 14hz is useless for music. I'd use 1.75 cubes for HT if you listen to music, if you only watch movies, than closer to 2 cubes/25hz tune. You should know that even on that 500/1 it probably wasn't pushed, even on 250W it looks like it's using all of it's excursion, what'll happen with more power is it'll move faster and get louder without more excursion. It should handle 750-1000W all day in 1.5 cubes with your gains up 1/2-3/4.