Cab Volume of 5.124 (which speaker to use)

BassGreaser · #1 04-25-2011, 04:15 PM

So I will be getting a Showman 15 cab which measures 36"W x 24" H x 12" D and has a inside volume of 5.124. I'm looking for the best (hopefully 4ohm) 15" speaker that will work with my GK 400RB head. What I would like it a lot of XMax and a a pretty flat response. I dont need a ton of low end.. what do you guys say...

Oh I'm not looking for a vintage JBL E140 or the like (unless I find one for a steal of a deal)

rpsands · #2 04-25-2011, 04:25 PM

Basslite C2515.

dhsierra1 · #3 04-25-2011, 04:35 PM

Eminence CA154 is 4 ohms and has a cab plan for a ported box very close to what you have (maybe 5.4 cu ft?), but from what I've read on TB some people have said that it's boomy in anything under 9 cu ft. I'd check the strings here for more info/insight on that.

Eminence Legend CB15 might be worth looking at as well, it too has a plan for a ported cab around 5 or so cu ft, but it's 8 ohms.

Neither of these are neo's, btw.

Having said that here's the Eminence C2515 that's a neo and 4 ohms but you'd have to model it in WinISD or some other box design program, unless of course someone who's much hipper to this stuff (and they are legion here) and has experience w/it chimes in, and no doubt they will. Hope this is of some help.

dhomer · #4 04-25-2011, 05:49 PM

Interesting scenario, but I'm not too familiar w/your amp/cab. How much power you pushing? Is the cab set up for just the single 15? Vented or sealed? If its vented, what's the port dimensions? Answers to these ?'s will go a long way to coming up w/an answer..

BassGreaser · #5 04-25-2011, 05:52 PM

i will be puching 125watts @ 8 ohms and 200watts @ 4ohm. the cab is sealed and its a 1x15 cab

dhomer · #6 04-25-2011, 06:26 PM

Just done a couple of quick and dirty models. The Basslite C2515 will model "ok" in this box, but the lower octaves will be kinda weak.. It'll start rolling off 6dB/octave at about 100Hz.. Power displacement should be marginally ok as well.. It's better than the CA154 in a sealed box. The CA154 will do better in here if the box was ported. Tune it to about 46 Hz. There will be a degree of "fullness" to the bottom end, it won't be real clean, but the bottom octave will respond a bit better. Not many options available unless you went 8 ohms or took off the baffle and went 2-12..

dhsierra1 · #7 04-25-2011, 06:42 PM

Quote:

Originally Posted by dhomer

Just done a couple of quick and dirty models. The Basslite C2515 will model "ok" in this box, but the lower octaves will be kinda weak.. It'll start rolling off 6dB/octave at about 100Hz.. Power displacement should be marginally ok as well.. It's better than the CA154 in a sealed box. The CA154 will do better in here if the box was ported. Tune it to about 46 Hz. There will be a degree of "fullness" to the bottom end, it won't be real clean, but the bottom octave will respond a bit better. Not many options available unless you went 8 ohms or took off the baffle and went 2-12..

that's a very good idea going 2-12

. You can port as well. For starters look at the Eminence S2012, two of those'll get you 4 ohms and 300 watts thermal limit. Need to model it, of course. Those seem to have good efficiency (on paper, anyway) too, esp w/the 200 watts out of that 400RB (a fine amp, use one for my rock rig). Oh, and those are neo's. Your next jump up from there would be the 3012HOs, but those are pricier, so depends on your budget.

will33 · #8 04-25-2011, 07:08 PM

Yeah, the 400rb doesn't really have the power to make use of a long excursion driver and that is a good size for a ported 212. Most aftermarket drivers will want to be ported anyway though some "will work" without. It's easy to do using pipe and you won't see it behind the grillcloth. That'll give you a single, 4ohm cab and most 12's that would fit the bill will end up being a bit louder than a single 15 so a little more sound coming out per watt going in, a plus with a smaller amp.

will33 · #9 04-25-2011, 07:19 PM

A pair of Beta12's would work fine in there. At a ~50hz tuning.

Little more info. That'd make a 100ish db cab. Shouldn't have to "struggle to be heard". f3 of 57-58hz means it'll sound full like a bass should but you wouldn't be wasting power trying to go really deep. Displacement limit would be 150-160 watts but they have an xlim of 11mm each. That means your 400rb would be able to push them into a little bit of distortion if you cranked it but it'd be virtually impossible for that amp to kill them. Worth looking at if money is a concern considering what neo prices are doing. Again, there's not enough power available there to make use of a single, long excursion 15.

More info here: http://www.eminence.com/pdf/Beta_12A.pdf