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Best enclosure for 15" audio nirvana?
Best enclosure for 15" audio nirvana?
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Old 23rd May 2016, 12:08 AM   #11
majerjack is offline majerjack  United States
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I used to install electronic church organs as a young man, and, indeed, organists and organ committees often requested a non-directional sound field. For the largest installations we would commonly use sealed 3-way speakers for the mains and sealed 15" subwoofers for the deepest tones including 32' stops. To get that "all around" ambiance we would install mid/tweet boxes at the rear of the sanctuary with the same stereo orientation as the mains.

In my experience if you can get the 16' stops to sound good you are about as far as you can reasonably expect to go. To get those 32' stops, which are more felt than heard, to readily audible levels you have to employ multiple large-diameter speakers in sealed cabinets driven by hundreds of watts of amplification. Of course, I am speaking of the large spaces of church sanctuaries, but I believe the same practices at reduced levels would apply in your case as well.

Based upon my experience I suggest that you seek out a design that you can place in the forward-facing corners if possible (to take advantage of boundary reinforcement for the best bass response) and mount them as high as is practical (to aid in the illusion of high-mounted pipes). If you can supplement them with subwoofers, so much the better. I also suggest some limited range speakers (perhaps small full range drivers in simple boxes) mounted high on the rear wall, in the corners if possible, with the same stereo orientation as the mains. If you can route the rear speakers through some delay/reverb/ambiance DSP I believe it would help the illusion. Power the mains (and subwoofers if you have them) with as many watts as you can afford. The rear ambiance speakers can be lower powered. The levels of all the speakers should be separately adjustable. I hope all this helps.
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Old 23rd May 2016, 08:41 AM   #12
cumbb is offline cumbb
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The Audio Nirvana 15" is to tune very very hard and to build in uncommonly to get a good, clean sound. Not the enclosure is the first problem.
I would build a cube, 45 x 50 x 50 cm, very good stiffed, good damped. Stands. "BR", "resonator" at the bottom.
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Old 23rd May 2016, 12:15 PM   #13
Scottmoose is offline Scottmoose  United Kingdom
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I would avoid a cube like a dose of the plague. If you want to maximise the potential for problematic standing waves, a cube is about the best way to achieve it I can think of.
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Old 23rd May 2016, 02:40 PM   #14
Scott the shepherd is offline Scott the shepherd  United States
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Quote:
Originally Posted by Scottmoose View Post
I would avoid a cube like a dose of the plague. If you want to maximise the potential for problematic standing waves, a cube is about the best way to achieve it I can think of.

Thanks for that Scottmoose, I had considered the Metronome, they have dimensions for an AN 12" cast frame.

So, thank you all for your helpful replies, but, has anyone actually heard them, and what is your impression? From what I can glean from your responses, those of you that have heard them, for the most part, are less than impressed, or are you just going from published numbers? If these are not good for my purpose, I need to know, and find out what would be better. You are the people I look to for knowledge in this department.

I am in an awkward position of not being able to audition anything, thereby relying on advice of others, and thus, their taste! I joined this forum because the people here seemed the most knowledgeable and diverse. So if I could ever find an answer to what I need, rather than just how to 'blow the trunk off'n my car', it would be here.

You folks are great!
~Scott
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Old 23rd May 2016, 05:07 PM   #15
hm is offline hm  Europe
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Default baley transmission line from 1972

i would try a baley transmission line from 1972,
a dead end on top, and inside material 3x softfibre 12 mm,
aproxi size 120 cm x 65 cm x ~50 cm ~400 L

http://www.hifiloudspeakers.info/Ana...ges/ww72b2.htm

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Last edited by hm; 23rd May 2016 at 05:12 PM.
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Old 23rd May 2016, 06:08 PM   #16
cumbb is offline cumbb
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All the omitted words about roaring, rumbling casings,-)
The sound of a 15" Audio Nirvana: discreet, relaxed, carton-ny, flat and covered "mids", bit scratching "highs". Listened with a good se. A rumbling, distorting pp does mask, gloss.-)
Very very much to do,-!
My mind,-)
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Old 23rd May 2016, 10:33 PM   #17
majerjack is offline majerjack  United States
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I have never heard the Audio Nirvana 15" speakers, but I possess a pair of the 12" cast frame model. Based upon the specifications, one would have to build a huge cabinet to get a good low frequency response, and I assume that the 15" driver cabinet would need to be even larger. I have never mounted my 12" speakers in a cabinet but have tested them on a 4' by 4' baffle, and on axis they shriek like a banshee, with a huge peak in the upper midrange. A rising response toward the treble is a common characteristic of many full range drivers, and I believe that most of the Audio Nirvana speakers have that characteristic. Other members may have more complete knowledge of the Audio Nirvana line and the 15" speakers in particular. I believe member Bigun has much experience with the 15" driver and likes it very much. I think that in any case you will need to build a very large cabinet for it.

It might prove helpful if you could describe the character of the sound you prefer and your budget. You say that the system for the organ also doubles as your stereo, so it might also help if you describe your amplification and your willingness/unwillingness to add components to the system as well as any restrictions on space and speaker placement.

It might make sense to simply build one of the speakers already recommended or to seek out a design you might otherwise prefer. I believe Troels Gravesen's site is a good source for a variety of DIY designs as well as educational information. There are many others if you are interested in additional research.
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Old 23rd May 2016, 11:54 PM   #18
chrisb is offline chrisb
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Considering the total bandwidth and power/duty cycle likely to be involved in playing down to 16Hz at any appreciable level, this sounds like an application where nothing short of professional grade PA / musical reinforcement would suffice, or more accurately, endure.

The name Danley comes to mind
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Old 24th May 2016, 03:19 AM   #19
norman bates is offline norman bates  United States
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scott is right on the cube.

I had/have a speaker which basically is a 6" cube, has a big peak at 1khz...............
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Old 24th May 2016, 09:36 PM   #20
Bigun is offline Bigun  Canada
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Best enclosure for 15" audio nirvana?
I love the 15" driver. I've only ever built single driver full range speakers - after all, 2-way's are ten a penny on the used market these days. Nothing has produced the satisfaction I've had from the AN 15" driver. Of course, I'm always open for new ideas but so far I have found much to like about this one.

oh, it needs a big box by the way. Mine is open-backed. Not quite a formal Boffle but close and that is often how I've referred to it over the years.

A Big'un - the Audio Nirvana Super 15
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