I need input please. Looking to build a cab.

Rob99s · #1 10-23-2011, 10:27 PM

I have four Eminence speakers as seen here. Avatar added extra xmax.
Speaker Detail | Eminence Speaker
I am looking to bulid a cabinet with all the speakers in their own vented compartment much like this cabinet.
The Mark Percy 4x15 Bass Guitar Cabinet

When I plug the eminence parameters into the design software, it gives me a box that is very wide and shallow and 4.7ish cu. ft. Can anyone reccomend a solution for me? Also I would like some input on the design of the 4 15" cab and whether it will be advantageous over a standard 4 12" cab.

The article suggests that a deeper box is better. Is this correct? My calculations show a box 12"x12"x15 is near minimum volume and 13"x13"x20" is near max volume that eminence recommends. (HxWxD)

dhomer · #2 10-24-2011, 03:17 AM

those dimensions for just one driver, or all 4? Generally I would agree deeper is better for one reason. You will need to make sure any porting is large enough not to make noises, yet small enough to fit correctly inside the box. Ports shouldn't be closer than 3" or so to any inside panel. You will also need to add the port volume back into the cab.. Also want to avoid anything resembling a cube. Results in lumped resonances, and crappy sound. You should be able to take that cubic volume, convert that to cubic inches, and calculate dimensions from there..

I would also consider making four boxes instead of making one big'un..

Rob99s · #3 10-24-2011, 08:05 AM

That dimension is per compartment and i wass hoping for a shelf port. I know the weight will be high but i do have a cart to move it with. Right now the speakers are in a 1970s kustom sro bass cab, and the combination sounds great. The problem is that the box is about to come apart. I was also considering building a very similar box but adding some depth and adding the compartment divider. I am just looking for something to do with these speakers that will work, it doesnt have to be 100% optimized or anything.

VisualShock · #4 10-24-2011, 09:44 AM

how about doing an angled baffle arangement? If you were to look down from above, have two drivers firing forwards and across the face of the cab, a long shelf port vertically down the middle, and then the other two drivers firing across the other way?

Rob99s · #5 10-24-2011, 11:31 PM

Like this but with a central port? http://www.google.com/imgres?q=kusto...:0&tx=66&ty=89

rpsands · #6 10-24-2011, 11:36 PM

Build half an SVT and stick some tube ports in the back. Probably to around 40hz with those OEM Deltalites I'd guess. The original deltalites want a lower tuning frequency than the Kappalite series, mostly.

By half an SVT I mean the right or left half, not the top or bottom half.

Rob99s · #7 10-25-2011, 12:07 AM

Interesting ideas, but I am also looking for a reason why these configurations would be better than a standard design or the cab in the article I mentioned. I am beginning to lean heavily towards replicating something I know works with a couple minor adjustments. It would al be fairly easy to replicate a fridge cab.

T-Bird · #8 10-25-2011, 03:46 AM

Hi.

I must be blind as I can't see the speakers, but assuming it's 10" drivers You're speaking about, then the suggested vertical 410 would be the best, if 2*210 for some reason isn't to Your liking.

If You don't know why, there's plenty of reading in the FAQ.

Regards
Sam

Mr. Foxen · #9 10-25-2011, 04:52 AM

Quote:

Originally Posted by Rob99s

I have four Eminence speakers as seen here. Avatar added extra xmax.
Speaker Detail | Eminence Speaker
I am looking to bulid a cabinet with all the speakers in their own vented compartment much like this cabinet.
The Mark Percy 4x15 Bass Guitar Cabinet

Most of the Mark Percy page stuff about cabinets is plain wrong, in the scientific/engineering reality sense. You can make much better sounding and much less unwieldy cabs than that (mate of mine made one, it is impressive visually). Basically, don't base anything off anything associated with that page.

billfitzmaurice · #10 10-25-2011, 07:39 AM

You seem to have attempted to put links in your original post, but there aren't any there.

Rob99s · #11 10-25-2011, 08:55 AM

I cut and pasted from my other post in the wrong section. I have 4 of these speakers: Speaker Detail | Eminence Speaker I got them through Avatar, I have no idea what the revised specs are but they supposedly have more xmax.
This is the article: The Mark Percy 4x15 Bass Guitar Cabinet

I spent a bunch of money on the speakers and now I need a good box. They sound really good IMO in the Kustom SRO bass cab from the 70s but I am sure it isn't optimal. Just looking for good ideas that I won't be wasting money if I give it a shot.

Mr. Foxen · #12 10-25-2011, 09:35 AM

This is what you need: LinearTeam

will33 · #13 10-25-2011, 10:08 AM

I have the same drivers and liking them. Mine are in about 2.25 cu.ft. tuned ~45hz. That's per driver. You could shrink it to 2 cu.ft., tuning 45-50hz. Configure the box in such a way you can mount the drivers in a vertical line. Can break it up into a pair of 2x's. Make up a series speaker cable if you can't run 2 ohms.

Bredian · #14 10-25-2011, 10:52 AM

Yours looks like a simple project, but I would consider these using 2x15s

Bill Fitzmaurice's site:

OmniTop 15

or the fEARful 151566 or a couple of each, maybe a 156 you could cart around easier and sell one.

fEARful™ enclosures for bass/drums/keys

Or make several and sell something. Lot of expertise here at TB.

billfitzmaurice · #15 10-25-2011, 10:58 AM

Quote:

Originally Posted by Rob99s

I cut and pasted from my other post in the wrong section. I have 4 of these speakers: Speaker Detail | Eminence Speaker I got them through Avatar, I have no idea what the revised specs are but they supposedly have more xmax.

The Avatar driver specs will be different, perhaps by a lot. When you change one spec you change them all.

Quote:

This is the article: The Mark Percy 4x15 Bass Guitar Cabinet
.

As already noted ignore everything there. Well designed cabs don't put drivers in a 4x configuration, and the port area he used is about 1/4 what they need to be to prevent chuffing. He knows not whereof he speaks.

seamonkey · #16 10-25-2011, 11:18 AM

Very good advice above.
Winisd and stack vertical

Now some bad advice, you could do isobarik. Winisd can model it.
You can add a midrange driver and have something you can't buy. Which might be for a reason.
Read the fEarfull threads.
Break in the drivers.
Model in winisd, build prototype, test it, tweak it, repeat as needed.

will33 · #17 10-25-2011, 11:19 AM

If yours are Avatar spec, I have a pair of those as well. IMO, they give up a whole lot in upper response for the wee bit you get down low. Unless you're just looking for a lot of low/lowmid thud without much going on in the upper harmonics, they're helped greatly by biamping to some 6's. If you think the 6's maybe too high or too "clear" something like an alpha8 will roll off the highs a little sooner.

Some specs on the Avatars in post #19 of this thread. deltalite version I vs. II

FWIW, I got ahold of some stock emi. spec DLII2512's and ran them oneway at a gig just to compare with the Avatars and the difference is pretty obvious. I still like biamping to the 6's but the 12's on their own had definition further up and sounded more musical.

Rob99s · #18 01-29-2012, 06:37 AM

This thread is long dead, but just for an update, the other day I found a Peavey TVX 412 cab for $100. The speakers work but make some noise, so I swapped in my Avatar spec 2512's and am waiting to get a chance to crank it up. The Sheffield speakers are going into the Kustom SRO bass cab and it will be sold. Would $150 be too much to ask?