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building a cab for 1- WGS BG-15C

F

firemedic925

Guest
Mar 6, 2012
31
0
#1
That's what I'm doing and I could use a little advice:

I bought the speaker a couple of years ago and it's all right in the generic MDF cab I have it in, but I want to build something better & lighter.

Problem: the T/S parameters I got from WGS does not include Xmax.

Has anyone built a ported cab for this speaker? If not, any suggestions on how to proceed without this spec?

Thanks
 
#4
Oh. I guess you even mentioned you need that, too.
What details can you give about the cab? Maybe just go through some trial and error with port length in the box its in? If you find something that "works" you could reverse engineer it (internally) with thinner wood and add bracing inside it.
I know that doesn't really help you with modeling it, but you may find performance you like better than you're getting now just by tinkering with the vent. Was it built by a "stuffer"? What cab is it?
 
#5
I don't know who built the cab, it was a homemade job, originally sealed and had a horn which I promptly disposed of. I calculated that it has @ 2.75 cu ft. I'd just like to build something a little better for this speaker which gets good reviews. Is there a "generic" (read, conservative) Xmax value I can plug in to make this cab? winISD has calculated a 46" tall cab which is larger than I really wanted.
 
#6
You can throw any number you want in there, it just won't matter. Shoot low, maybe 2-3mm? The most beautiful frequency plot in the world is useless if the excursion limits you to bedroom volumes. Does the speaker get good reviews from guitarists? Honestly with no xmax available, anyone getting good results with it is lucking out. Do any of them mention anything about the box they're using it in? Maybe see if you can get some direction from the people posting these great reviews...?
 
#7
I can't seem to find any cab info. WGS doesn't have any. Nobody seems to. I will say that it sounds awesome with a guitar. Here's my uneducated solution: if I can't get an Xmax rating, I'll go with 4mm. Make the cab & cross my fingers.
 
#8
I'd bet it's just a "token" bass speaker designed to add a "bass" speaker to their lineup. WGS is s popular brand among guitarists, and do get great reviews for their GUITAR speakers. I didn't even know they had any bass speakers. Are you sure this 15 is actually a bass speaker and not just a 15" guitar speaker?
 
#9
I would actually say to go with 2 or 3 mm to give yourself a less optimistic model. If it turns out that it has better xmax, no problem. If you go with 4mm and it turns out the xmax is actually 2.5 or something, you may have just wasted your time and $$. I still think just tinkering with the cab it's in now is a good idea. If you end up making something good happen, you can start a new build knowing what results you're going to get.
 
#10
No, it's really a bass speaker. The G15C is for guitar, this is a BG15C. I'm actually thinking of making a big sealed cab for it (W1, H1.618, D0.618) because it will be more forgiving, and making a ported cab for my Peavy Black Widow, for which I have all the specs I need. Nothing could possibly go wrong...
 
#11
Well so much for the sealed cab idea. Even at @170 liters, it sounds freaking awful. Good at low volume but turned up past 5, no way.

Since I built the amp there's that unknown too; I don't really know how powerful it can get. It idles at 92W w/ 4-6550s. 2 preamps based on an Ampeg B-25B
and a 5F6a bassman (option to parallel them), with a B-25B concertina PI.

The good news is that WGS finally sent me the Xmax (0.375) so that I can get a good idea how best to port it. I think this is gonna turn out ok. Stay tuned.
 

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