Luke: Box specs?

[87e30]

Luke, you're the man. That is all.

[StereoInstaller1]

Luke, thanks so much for the info. Please please don't let anything out that you don't want to. I totally respect what you on here and don't want to offend you or anything.
With that said, I totally did not even think about the "cab gain" or whatever the hell the term is for it. You are dead on with the S10 peaking like hell at around 60hz. I HATE HATE peaky bass around 60-80hz, I like LOW, smooth bass which is why I was shooting for 27hz. You said I would want to tune higher in this situation but won't I be forced to set my high pass to appox the tuning of the enclosure and then I'd pretty much lose anything below that? A sub would be no fun if you couldn't hit the low note in "Put On." I'm a real noob to audio but trying hard to learn. Any help would be appreciated. So I don't have a clue as to what I should tune to if E30s are typical for peaking around 40 and 100hz. My driver is an Fi Q10 powered by a Sundown 1000D. Here are the specs of the driver:

DUAL 1 | DUAL 2 Fs: 34.1 Hz | 34.0 Hz Re: 0.70 Ohms/coil | 1.4 Ohms/coil Qms: 7.31 | 7.38 Qes: .37 | .37 Qts: .36 | .36 Mms: 230g | 2235g Cms: .88mm/N | .88mm/N Sd: 310cm^2 | 310cm^2 Vas: 11.8 l | 11.8 l Spl: 83.3dB 1W/1m | 83.2dB 1W/1m Bl: 13.9 N/A | 19.6 N/A Xmax: 28mm Rms: 1000W Sealed box: .2-.6 cuft HQTS Ported box: .5-1.2 cuft @ 28-33Hz Sub OD: 11.000” Cut ID: 9.250” Mounting depth: 6.500” Displacement: 0.12cuft

I don't know 3/4 of the stuff on that list means. What are your suggestions I try and tune to if you don't mind? Thanks!


Mike B.

Actually, I would start right at 35Hz on that woof...the Fs is higher than I would normally want to see, but with .36 Qts, it should work well.

Still, it is only gonna cost you $5 more to make your tuning adjustable, so why not?

[mrbobian]

Actually, I would start right at 35Hz on that woof...the Fs is higher than I would normally want to see, but with .36 Qts, it should work well.

Still, it is only gonna cost you $5 more to make your tuning adjustable, so why not?

Alright. I will deff take your word on this one. I have a few weeks before I actually begin construction (away at college right not) but plan on getting going as soon as finals are done. I'll be sure get pictures and post up everything one here. Thanks for all your help. I'm sure I'll have plenty more questions to come too.

Mike B.

[foglght]

I'm not sure what the box was designed for as far as woofer, but generally I can get decent predictions (minus transfer function/cabin gain) with winisd.

I can't tell what the box is designed for, an 8 or a 10. I have plenty of 10's hangin around. Might try and build one sometime soon for a sealed ED 110v.2, or the Diamond D6.

More interested right now in getting the doors all situated. I REALLY wanted to do kicks, but its tight down there, and I actually use my dead pedal.

[mrbobian]

Spent quite a bit of time drawing things up in NX5 and tweaking here and there. It was quite the process of getting a whole lot into a small space.

I worked it out to be a gross vol. of 1.56ft^3 and with the maximum port length (39in) I get about a 1.08 net volume. Using 4in PVC puts me right around 27.5hz , being the lowest I can go. Im thinking I can build it and play around with port length until I get it sounding exactly how I want it.

I still have some fitment issues to work out with the magnet hitting the bottom of the box but I need to actually get the mag diameter to do that...
Also I need to measure the actual space in the trunk to figure our how big the "faceplate" thing needs to be and where it goes. Tell me what you think:

[SoEm0]

That is pretty beasty. Did you calculate in the sub/port displacement?

[mrbobian]

Yes I did. 0.12ft^3 for the driver and 0.368ft^3 for the port displacement...

It looks a little awkward too because I made the OD of the PVC 5in in the draft because that is the biggest part if I use the bends.

[StereoInstaller1]

That won't fit.

There isn't room to fit a 4" port and a 10" woofer in the opening of the ski pass.

Nice try though! Look at this pic, see how crowded it is already?

[mrbobian]

Humm... How wide is the "faceplate" thing that recesses the driver in that picture?

[StereoInstaller1]

Like a foot or so? Fuck, I dunno. It has to fit my jig precisely, measuring days were long ago.

[mrbobian]

Huh... Well I don't know then. Since I didn't know how wide it has to be yet I used 11.5'' and the rest as well is VERY carefully and precisely drawn to scale. The only sad thing is I don't have the car around yet to do some real measurements...

[StereoInstaller1]

Well, check this out:



Yeah, there is plenty of room on the plate, but none between the woofer and ports, and then again no spare space around the hole of the pass through...getting the ports and the woofer on that panel is a squeeze.

Another thing you might wanna think about is the placement of the end of your port tube inside the box.

The opening being perpendicular to the face of the woofer is like blowing across the top of a bottle.

[NeoMishMoo]

Starting building my crappy adaptation on Luke's design yesterday, but after seeing these pictures I'm really craving the real thing!