I think it's a big box which was IIRC designed for exceptionally high efficiency.
You need to understand that you're up against Hoffman's Irow Law - Small, Low, Efficient - pick any two.
For my subs, I picked 40Hz as my "low", and then played around with the other two to see what I can get.
We can't pick your compromises for you. Your first post says you want a punch in the chest in large venues and outdoors. I don't think two of any of those cabinets will do what you're after. For reference, my PA system will do that, but it's a total of 8x 15"s in ported boxes, loaded with some really good drivers.
Chris
You need to understand that you're up against Hoffman's Irow Law - Small, Low, Efficient - pick any two.
For my subs, I picked 40Hz as my "low", and then played around with the other two to see what I can get.
We can't pick your compromises for you. Your first post says you want a punch in the chest in large venues and outdoors. I don't think two of any of those cabinets will do what you're after. For reference, my PA system will do that, but it's a total of 8x 15"s in ported boxes, loaded with some really good drivers.
Chris
out of my toys (I'm ~immobile and never done real PA work) this one had a little kick for a cheap 18" driver
You mean like the THAM18 😉 although it may be slight larger (312dm3 external volume instead of 260dm3 as in your example).
Martinsson's Blog -
Can you spare an inch? 🙂
20" x 25" x 30" dual-expansion THAM-style layout, using a B&C 15TBW100. This is without any semi-inductance or lossy Le modelling though. If I can get hold of a ZMA impedance file for the B&C 15TBW100, I'll be able to calculate the semi-inductance parameters and include those in the model.
I think the Dayton Audio PA380 might work in the same box. It has a much lower Xmax, but it's also a lot cheaper.
20" x 25" x 30" dual-expansion THAM-style layout, using a B&C 15TBW100. This is without any semi-inductance or lossy Le modelling though. If I can get hold of a ZMA impedance file for the B&C 15TBW100, I'll be able to calculate the semi-inductance parameters and include those in the model.
I think the Dayton Audio PA380 might work in the same box. It has a much lower Xmax, but it's also a lot cheaper.
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Thanks brain Steele. Looks ok, definitely a possibility... the one that’s keeps coming up on top in my sims in the SS15 with a 18tbx100... just trying to find a slightly lighter Driver. And cheaper if I can.
Im only just scratching the the top layer with this program and I don’t really understand It fully, and I’m not going to pretend like I do. But I think I get the basics, But this is the best looking result I’ve had so far.
Im only just scratching the the top layer with this program and I don’t really understand It fully, and I’m not going to pretend like I do. But I think I get the basics, But this is the best looking result I’ve had so far.
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From that graph, it looks like the semi-inductance option wasn't enabled for that sim.
If you are set on using an 18" driver in your build, going with a BVR or OSTL alignment might be better, given the restricted dimensions that you have to work with.
If you are set on using an 18" driver in your build, going with a BVR or OSTL alignment might be better, given the restricted dimensions that you have to work with.
Well I had a pair of Yamaha 15” reflex sub years ago, and they were pretty pathetic, you hardly knew they were on.. so I’m slightly reluctant to go back to 15”s even though I know they will be very different. And I don’t want to build 15s and wish afterwards I’d build 18s. So my general thinking is to cut out the middle man and go straight to 18s if I can.
At the risk of sounding very dull, I don’t know what that means ?? What is a BVR or OSTL alignment? I’ve never come across that term before
At the risk of sounding very dull, I don’t know what that means ?? What is a BVR or OSTL alignment? I’ve never come across that term before
BVR = Big Vent Reflex
OSTL = OffSet Transmission Line
The OSTL should have a wider usable frequency response than the BVR, at the expense of some efficiency.
hmm I need to make one tham15, just to see which one is better overall cubo15 or tham15.
I have one cubo15, just finished some measurements @ outdoors / ground plane.
Orange: cerwinvega 12", reflex (just for comparsion), 2.8V @ 1m
Red: cubo15, 2.8V @ 1m
Blue: cubo15, 20V @ 2m
Green: cubo15, 20V @ 1m
Calbrated mic, umik-1 was used.
I have one cubo15, just finished some measurements @ outdoors / ground plane.
Orange: cerwinvega 12", reflex (just for comparsion), 2.8V @ 1m
Red: cubo15, 2.8V @ 1m
Blue: cubo15, 20V @ 2m
Green: cubo15, 20V @ 1m
Calbrated mic, umik-1 was used.
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