Advice for a big room FR speaker build - diyAudio
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Old 27th July 2012, 05:33 AM   #1
ParsonL is offline ParsonL  United States
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Default Advice for a big room FR speaker build

I have a large room that I would like to build a full range speaker. Most of the projects I've seen seem to be for smaller listening room (relatively speaking). Here is some data on my listening room I am trying to accommodate.
1) My room is 40' wide x 60' long x 10' ceiling (though 2 rooms cut into this footprint making the total sq. footage more like 2000.
2) The room is fairly live
3) Due to layout, I will not be able put the speakers in the corners of the room. They will go up (flat) against the end wall and be approx 16-17 apart from each other.
4) My listening distance from the speakers will be approximately 18' or so from the speakers

I'm considering the Audio Nirvana 15" in their recommended 5.6 cabinet, but would like some recommendations for other drivers and cabinets that might be well suited for this larger environment.

Anyone have experience with the AN 15" in a 5.6 cabinet in a large room?
Any ideas on another cabinet design that might utilize more height and less footprint? Metronome?

I want to build something that will fill and match the room size.

Any suggestions would be most appreciated.
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Old 27th July 2012, 06:11 AM   #2
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Parson,

5.6 ft^3 is an awefully tiny box for the AN15.

I modeled my miniOnken alignment for these (miniOnkens tend towards small for a specific driver) and i ended up with 600 litres ~ 21 ft^3 for a minimum volume.

Even for a small as possible aperiodic box 5.6 ft^3 is a bit too small.

dave
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Old 27th July 2012, 06:18 AM   #3
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600L... he could just partiton off part of the room as a cab...
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Old 27th July 2012, 06:36 AM   #4
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Well, you don't have corners but perhaps something like the big fun horn with a panel next to it masquerading as a side wall may do the trick?

Otherwise, in a room that size I would be tempted more by a professional 15" coaxial driver.
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Old 27th July 2012, 02:51 PM   #5
ParsonL is offline ParsonL  United States
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Thanks for the insight on box size. If I can accommodate that size (21 cu.ft), could I utilize a design that takes advantage of my ceiling height, keep the footprint small, and keep the cabinets from sticking out too far from the wall - without suffering acoustical degradation? Perhaps dimensions like 8' tall x 2' wide x 1.5' deep with driver mounted near the middle???
Would going with a smaller driver like AN 12" be better?
How would the metronomes work with the 12" drivers in my room?
Any of the Spawn Family of horns recommended for this application?
Any other quick thoughts?
Thanks much for the help?
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Old 27th July 2012, 03:10 PM   #6
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You'd run into standing waves with those dimensions. Not necessarily a problem, just needs to be taken into account.

The 5.6 IMO is too small a cabinet for the AN 15, except in a handful of particular circumstances.

Depends what you want. I suppose you could try something like Kirishima if you like back-horns, but that's a heck of a room size & while they're fairly substantial by a lot of single driver back-horn standards, even they might struggle. IMO, you're likely to be better off with a couple of HE 15s on the bottom end crossed to wideband compression mid-tweets.
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Old 27th July 2012, 05:44 PM   #7
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Quote:
Originally Posted by ParsonL View Post
Thanks for the insight on box size. If I can accommodate that size (21 cu.ft), could I utilize a design that takes advantage of my ceiling height, keep the footprint small, and keep the cabinets from sticking out too far from the wall - without suffering acoustical degradation? Perhaps dimensions like 8' tall x 2' wide x 1.5' deep with driver mounted near the middle???
If you want to tackle a project like that , i'm willing to draw up a beta plan for them. I hope you are yound and fit, and have a couple friends to help when they need to be moved about.

dave
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Old 27th July 2012, 06:32 PM   #8
ParsonL is offline ParsonL  United States
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Yes I'm willing to tackle the big box project - if think it will be worth it. Many thanks.
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Old 27th July 2012, 06:37 PM   #9
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Send me an email.

dave
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Old 27th July 2012, 07:12 PM   #10
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I will be in the market for a 15" AN AlNiCo as well. The company recommends a 13.6 cabinet, but I know there are better options.
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