I have some spare drivers and I need better center coverage so I'm designing a fairly simple cabinet for use in front of a DJ booth. 2 - 15" woofers. I could just do a simple bass reflex design but I wanted to run a design by you folks.
Ported rear chamber opening up into a horn with the HF mounted at the mouth of the horn. It will be bi-amped with active processing.
Woofer - Selenium 15W10P-Nd 15" Neodymium Woofer
Horn - Selenium HC23-25 1" Exponential Horn 100x40 1-3/8"-18 TPI
This is a VERY rough concept [Image sketched in top view]
Any thoughts, critiques, suggestions, tip are certainly appreciated!
See attachment for my idea.
Thanks guys!
Ported rear chamber opening up into a horn with the HF mounted at the mouth of the horn. It will be bi-amped with active processing.
Woofer - Selenium 15W10P-Nd 15" Neodymium Woofer
Horn - Selenium HC23-25 1" Exponential Horn 100x40 1-3/8"-18 TPI
This is a VERY rough concept [Image sketched in top view]
Any thoughts, critiques, suggestions, tip are certainly appreciated!
See attachment for my idea.
Thanks guys!
Attachments
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I'm mostly interested in the co-planar effects and dispersion of having the woofers canted inward instead of a bass reflex design where both woofers would be mounted on the same flat plane. They will receive about 50-2k Hz.
Thanks!
Thanks!
Hmmm...
I think you're gonna struggle to get a 1" compression driver down low enough to avoid lobing on the 15"s. Remember the 15"s will start beaming (individually) in the hundreds of Hz.
Even a chunky 2" driver will have a hard life here.
IMHO, if you need the SPL from a double-15", you're going to need something of the other of a horn-loaded 6-8" mid plus your compression driver.
Chris
I think you're gonna struggle to get a 1" compression driver down low enough to avoid lobing on the 15"s. Remember the 15"s will start beaming (individually) in the hundreds of Hz.
Even a chunky 2" driver will have a hard life here.
IMHO, if you need the SPL from a double-15", you're going to need something of the other of a horn-loaded 6-8" mid plus your compression driver.
Chris
I think your right. I was realizing that I'm going to have beaming issues like you said... I'm not married to the design... they are tricky woofers that want over 4 cubic feet each in a sealed chamber. Back to Sketchup!
This should address the beaming and I can time align with processing. My only reservation is the back chamber being nowhere near the 8+ cubic feet required for two of the drivers in a sealed chamber.
Obviously low end response will suffer but if I can maintain "punch" around 80Hz I'll be happy. It's going to sitting on top of a dual 15" sub cabinet anyway.
Obviously low end response will suffer but if I can maintain "punch" around 80Hz I'll be happy. It's going to sitting on top of a dual 15" sub cabinet anyway.
Attachments
From your initial design, it looked as if there might be a height restriction. Is that not so?
Are you absolutely set on those 15"s?
If you've got subs, a 2x12" would end up smaller and lighter, but still provide a lot of output if 80Hz is your cutoff. The smaller drivers would also mean a higher crossover point is possible, giving the compression driver an easier time.
Which compression driver will you be using here?
Chris
Edit - just re-read your OP, and it looks like you already own those drivers. There's a chance you could sell/swap for something a little more suitable, though its fair enough if you'd rather stick with them.
Are you absolutely set on those 15"s?
If you've got subs, a 2x12" would end up smaller and lighter, but still provide a lot of output if 80Hz is your cutoff. The smaller drivers would also mean a higher crossover point is possible, giving the compression driver an easier time.
Which compression driver will you be using here?
Chris
Edit - just re-read your OP, and it looks like you already own those drivers. There's a chance you could sell/swap for something a little more suitable, though its fair enough if you'd rather stick with them.
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Thanks for the reply. I'm trying to put the 15s to use so it's a comprise between buying parts for an ideal application and using what I already have. I would go with the 12s for a more ideal build but I'd really like to use what I have for this project.
The compression driver is from an old theatre I worked in. They are impossible to get specs for... Zomax with a hand written model number! I'm at work so I don't have it with me at the moment [JBL copy I can only presume] This looks like a close match but who knows! JBL 2426H 1" Titanium Horn Driver 8 Ohm 3-Bolt
Woofer Specs: http://www.parts-express.com/pedocs/specs/264-443-selenium-specifications-45776.pdf
The 15's should handle up to 2k with a 24 or 48 dB slope. Looks like a 5 dB drop 30 degrees off axis at 2k [desired xover point]
This project is a gamble for sure. I just want to get things as spot on as possible [realizing that there will be certain deficiencies].
The compression driver is from an old theatre I worked in. They are impossible to get specs for... Zomax with a hand written model number! I'm at work so I don't have it with me at the moment [JBL copy I can only presume] This looks like a close match but who knows! JBL 2426H 1" Titanium Horn Driver 8 Ohm 3-Bolt
Woofer Specs: http://www.parts-express.com/pedocs/specs/264-443-selenium-specifications-45776.pdf
The 15's should handle up to 2k with a 24 or 48 dB slope. Looks like a 5 dB drop 30 degrees off axis at 2k [desired xover point]
This project is a gamble for sure. I just want to get things as spot on as possible [realizing that there will be certain deficiencies].
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