12" & 15" Earthquake Sub. Build for bbeljefe

[bbeljefe]

Oh wow man, that's one nasty lookin little beast! You did an awesome job on both of them, Trent. The workmanship is top notch and I can't imagine how you could have been more helpful from a customer service perspective.

Can't wait to get these things in some boxes to see how they slam. I'm thinking Fs is gonna come down 3-4 Hz on each one, so I'm gonna tune the line for the 12 at 35 Hz and let it ride. The one for my Zv3s is tuned 5 Hz below Sundown's published Fs and that thing is a LOW note beast, so I bet this one will be too.

I just hope the 12 doesn't laugh (too hard) at the paltry 1400 watts it's gonna get. :-)

[Purplehaze]

Thanks man, I'm glad you like 'em. I just hope they perform well for you. And I'd hold off and see what #'s you get from them cause I just don't think my numbers are accurate at all. It could be something to do with my sound card, or many other things. Plus my HD is full, and the whole lap top has been acting funny. So i'd wait and see what you get. And I'll bet that the 15 drops more than 4hz after break-in. (I'm thinkin more like 10, we will see) In the end I just hope you are happy with them. I am glad for the experience.

[knowledge]

dope!

[bbeljefe]

Why do you think Fs will drop so much? Do you mean -10 from your (possibly wrong) numbers or -10 in reality?

We'll know for sure if your numbers are correct when I get them but unless I'm missing something, I don't see that much of a drop. And who cares if there isn't... high Fs isn't a bad thing on a low compliance sub... it's the norm.

Oh and, what did you get for Qes? I'm interested in the EPB for these beasts. With that high an FS, it should be pretty high as well.

[Purplehaze]

Oh and, what did you get for Qes? I'm interested in the EPB for these beasts. With that high an FS, it should be pretty high as well.

Yes sir, it is. Here are the #'s for the 12

* This data was exported from DATS the Dayton Audio Test System

*

* Manufacturer: Trent Stover - Purplehaze

* Model: 12" Earthquake

* Piston Diameter = 247.7 mm

* f(s)= 39.12 Hz

* R(e)= 3.78 Ohms

* Z(max)= 16.87 Ohms

* Q(ms)= 5.819

* Q(es)= 1.682

* Q(ts)= 1.305

* V(as)= 14.720 liters (0.520 cubic feet)

* L(e)= 3.88 mH

* n(0)= 0.10 %

* SPL= 85.02 1W/1m

* M(ms)= 210.00 grams

* C(ms)= 0.05 mm/N

* BL= 22.07 (N/A)

And here is the 15

* This data was exported from DATS the Dayton Audio Test System

*

* Manufacturer: Trent Stover - Purplehaze

* Model: 15" Earthquake

* Piston Diameter = 308.0 mm

* f(s)= 49.22 Hz

* R(e)= 2.88 Ohms

* Z(max)= 16.68 Ohms

* Q(ms)= 7.186

* Q(es)= 1.497

* Q(ts)= 1.239

* V(as)= 14.840 liters (0.524 cubic feet)

* L(e)= 2.39 mH

* n(0)= 0.20 %

* SPL= 85.03 1W/1m

* M(ms)= 361.10 grams

* C(ms)= 0.02 mm/N

* BL= 26.06 (N/A)

Oh and the reason I think that way is how much these spiders and surround will loosen up after break-in.

I may be wrong though, just my guess.

[420c]

this is a great thread, you made a perfect guide to recones. cant wait to see them in action.

[bbeljefe]

Wow... EBP is super low on those subs. I'm thinking there is something wrong with your DATS calibration or your computer.

Ah well, I'll check em and see where we are with it.

[Purplehaze]

Wow... EBP is super low on those subs. I'm thinking there is something wrong with your DATS calibration or your computer.

Ah well, I'll check em and see where we are with it.

Yeah I've been saying that all along. I have yet to get a proper reading with this, on any sub. And I believe the problem is my computer.

Trust me, I spent hours making sure it is properly set-up, and I'm doing exactly what I'm supposed to.

I think there is something wrong with my sound card. It's just the factory setup on a 4 yr old HP G60. Never was all that, even when it was new.

I just need to get myself a new computer... or build one.

Anyway let me know what kind of #'s you get. And hopefully they are what you want.