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View Full Version : Subs FS same as my car's peak.



hispls
06-29-2012, 10:38 PM
Made some new 12's today I'm very happy with, but they have FS of 55hz. They sound quite good in a large, somewhat low tuned box, but thinking of SPL box application I see high impedence being an issue though I think there must be some opportunity for efficiency here somewhere.

Anyone have any experience with this?

RangerDangerV2
06-29-2012, 10:39 PM
smaller box with more port?? might do the trick...

Buck
06-29-2012, 10:41 PM
What's the Qts?

---------- Post added at 09:41 PM ---------- Previous post was at 09:41 PM ----------

And Vas while we're at it?

groundpound4200
06-29-2012, 10:45 PM
.5 cubes sealed should do the trick for max spl :fyi:

Falcons
06-29-2012, 10:47 PM
.5 cubes sealed should do the trick for max spl :fyi:

This brought the lulz. I needed that thanks haha

CAT MAN
06-29-2012, 10:51 PM
TaylorFade

hispls
06-29-2012, 10:53 PM
What's the Qts?

---------- Post added at 09:41 PM ---------- Previous post was at 09:41 PM ----------

And Vas while we're at it?

* f(s)= 55.18 Hz
* R(e)= 6.10 Ohms
* Z(max)= 29.10 Ohms
* Q(ms)= 2.649
* Q(es)= 0.703
* Q(ts)= 0.555
* V(as)= 20.580 liters (0.727 cubic feet)
* L(e)= 3.47 mH
* n(0)= 0.47 %
* SPL= 88.81 1W/1m
* M(ms)= 213.40 grams
* C(ms)= 0.04 mm/N
* BL= 25.35

I expect Fs, Qms and Qts to shift a little bit as the suspension loosens up, but in theory I can change compliance with different softparts

Buck
06-29-2012, 10:59 PM
What woofer is this?

ciaonzo
06-29-2012, 11:53 PM
Surprised to see Qes sitting at .7 while BL is at a pretty respectable 25ish.

hispls
06-29-2012, 11:53 PM
What woofer is this?

Shocker Sig Neo using new dual 3 ohm copper Sig coil, Hawley cone and 3 spiders

hispls
06-29-2012, 11:58 PM
Surprised to see Qes sitting at .7 while BL is at a pretty respectable 25ish.

Something about this neo motor... this was an 18" I did with the dual 2.8 ohm Aluminum and very stiff suspension:

Fs 45.09 [Hz]
Zm 21.64 [Ohms]
BL 22.81 [N/A]
Qms 2.897
Qes 0.984
Qts 0.735
Vas 113.900 [liters]
L10k 2.86 [mH]
n0 1.01 [%]
dBSPL 92.15 [1W/1m]
Ms 329.30 [grams]
Cms 0.04 [mm/N]


Qes and Qts are generally very low with ceramic sig.

ciaonzo
06-30-2012, 12:07 AM
Interesting. Yeah, Qes/Qts should be insanely low, all things being equal. Seems like either you could fit more layers in the gap or the motor needs a chargin'.

Or maybe that's jes how it is, lol.

hispls
06-30-2012, 07:05 PM
Interesting. Yeah, Qes/Qts should be insanely low, all things being equal. Seems like either you could fit more layers in the gap or the motor needs a chargin'.

Or maybe that's jes how it is, lol.

Gap is tighter than a 12 year old's shoelaces and if you ever tried to remove something ferrous that was stuck to these motors you wouldn't question the integrity of the neo....really even assuming the neo lost 80% of it's strength it would still have as much magnetic force as the ceramic sig.

Just how it is I think, these motors give some wild specs with aluminum coils as well.

05trailblazer
06-30-2012, 07:56 PM
pics of sub!

ciaonzo
07-01-2012, 01:06 PM
Gap is tighter than a 12 year old's shoelaces and if you ever tried to remove something ferrous that was stuck to these motors you wouldn't question the integrity of the neo....really even assuming the neo lost 80% of it's strength it would still have as much magnetic force as the ceramic sig.

Just how it is I think, these motors give some wild specs with aluminum coils as well.Crazy.

Well, either way, keep doin' it. And I hope you didn't take my suggestions as me underestimating your abilities, wasn't aiming at that.

Buck
07-01-2012, 02:07 PM
What you need to do is get some aeros and do some testing.

hispls
07-01-2012, 06:04 PM
Crazy.

Well, either way, keep doin' it. And I hope you didn't take my suggestions as me underestimating your abilities, wasn't aiming at that.
I didn't get that impression, just saying the neo isn't "worn out". Nor do I really believe that that is an issue to worry about whatsoever.

Super busy getting ready to take a week's vacation. Will have pics next week assuming they survive that long.

keep_hope_alive
07-02-2012, 12:41 AM
hand-building subs is freakin' cool. my hats off to you both.

TaylorFade
07-02-2012, 06:45 PM
What vehicle is this again? You run outlaw or sealed?

hispls
07-03-2012, 12:25 PM
What vehicle is this again? You run outlaw or sealed?

97 Jeep Grand Cherokee. I drive over 40K miles a year so I mostly need music, but when I compete everything is sealed at the dash.


Also pics:

http://i53.photobucket.com/albums/g69/hispls/2-12%20shocker%20builds/DSC02793.jpg
http://i53.photobucket.com/albums/g69/hispls/2-12%20shocker%20builds/DSC02792.jpg


New carbon fiber/kevlar dustcaps are coming out pretty nice IMO. Each batch I make comes out a little better than the last.

DoesDad
07-03-2012, 12:34 PM
They look good! I'd like to learn how to do that...

Kangaroux
07-03-2012, 12:47 PM
Yo Jon throw me a PM on the price for an 8" CF dustcap