DIY cab for a Dayton PA380-8?

1.5 cu.ft. is going to neuter ANY 15, unless it's for a sealed box and meant to be run that way.

Sure that box design wasn't for a midbass, meant to be run with a sub?

 

I totally dig "embiggenating".

I'd have to dig deeper to have any more input worth a damn.

 

That Dayton PA380 really would run nicely ina 3cu ft cab tuned to 45-50hz like you said. 1.5cu ft (ported) is really to small and that drivers isn't designed for closed cabs (Qes is only 0.24).

 

IMO, -3db @ 50hz already makes for a pretty deep sounding speaker, plenty of typical 410's, etc. roll off higher than that.

I'd compare max power handling charts and see how much your excursion limit goes down with each larger box size. That's going to be your fartout limits.

 

The versions of Win Isd on the Linearteam website has been superseded. The one to use is on their http://www.facebook.com/l.php?u=htt...bf3KsGuOnO4eqB-_aLVYkG6J_ns0kWYv42jEllbZT&s=1

This one has cone excursion as one of the plots. Be sure to read the tutorial on how to enter data first though .

 

If you're using WinISD Alpha Pro, it's in the dropdown menu above the graph where all the other choices are, like spl, transfer function, port air velocity, etc. I don't remember from the old Beta version but I think it at least has a cone excursion chart. There you'd just try higher and higher input signals until the graph reaches the line of the drivers xmax spec.

Alpha Pro is also free download. If you don't have it, I'd get it. It's more detailed...more charts, etc. Don't know if it's been mentioned, but I'd use a minimum of two 4" ID ports if you're using pipes. Or at least the equivelent amount of area if using another style of port. More is OK. Less can lead to problems with drivers that have any good amount of xmax...say 3-3.5mm or more.

Re: your stereo speaker designs......yes, you'd want deeper like that for full reproduction of recorded music without a sub. For a live bass rig...not so much. Some like it. It isn't really "needed". More of a subjective taste thing.


FWIW, a lot of live concert subs are highpassed @ 40hz and the bass is usually slotted just above the kick drum (but still below everything else (obviously). IMO, 50hz is plenty deep. Could reach deeper if it doesn't give up too much excursion limited power handling. Some all-in-one bass amps have the very bottom filtered down, some don't. Many good sounding bass cabs start to roll off higher than that. The SVT 810 rolls off higher still, up around 80-100 hz, but at a more gradual rate being a sealed design.

If it's difficult to make the choice...it's easier to shrink a box than it is to expand one.

 

whoah. 70 bucks for one of these???? Really gets a man to thinking...

 

thanx wull..
looks like these daytons require bigger ports than (for example) a cb158?
do you'allz think these freq specs are real.. 4k seems a little exaggerated for a 3" voice coil 15..
has anyone tested the freq. resp of these?

 

You can also plug the driver's parameters into Francis Deck's free online speaker modeling program, which puts out some useful charts:

http://personalpages.tds.net/~fdeck/bass/speakerjs/speaker.html

 

IDK how your discount works, but I'd look at some other 15's near that price as well. Go +/- a few cheese burgers worth of pesos and there are quite a few. Many of the eminence give drawings for several different cab sized and sealed or ported. First cab, sealed is a lot simpler and there is a lot more room for error as far as getting the volume right. @basscooker has done well with very inexpensive MCM drivers. This one will be more since you get a discount at PE, but it sounds great in a 3 cu ft sealed cab. Heavy old school sucka. MCM Audio Select 500W Rms 4 Ohm Paper Cone Woofer 15 Inch Die Cast | 55-3243 (553243) | MCM Audio Select would not fart out on one channel of my BX1600 until I dimed all the knobs and hit it hard. I moved on to an Eminence 3015 modified with an aluminum cone, but the MCM PA driver had more low end.

 

thanx bad example
cool, but it's a 500 watt speaker with 100oz magnet, and costs more than a cb154 for a 4 ohm, and the specs say it goes only to 2.5k, was kinda thinking a full range speaker for this ampeg 15e cab i got.
but i will ck out bass cookers page too!
p

 

good info..
Sounds like this dayton may be good for this empty 115 ampeg (w 3 little ports on bottom) that i have (is around 2.7 cf i think)
i got it use with a gummed up bw 15 (4ohm) pretty sure that 2.7 was too small for the peavey BW anyways?