Help me design a horn

[unknownuser200]

the sub woofer :

Maelstrom-X 18"

http://www.diycable.com/main/product_info.php?cPath=24_93&products_id=681

Amplifier :

Lt/1300

http://www.edesignaudio.com/product_info.php?cPath=2_106&products_id=500

was looking for this setup to get low for a home theater setup but still be able to play the occasional music on it... have descent output... along with min distortion... so a sql setup? i think a horn would do me well .... suggestions or help would be great

 

[technofreak]

This thing would likely not work very well in horn, IMO.

EBP is only ~39. Horns need at least 100, the more, the merrier (though eg LABhorns get away with 56). Bl is not very good also, considering the enormous moving mass. It would probably sound pretty floppy in a horn. But the main problem is that such horn would be truly enormous in size. I would rather recommend a pair (or quartet) of LABsubs, corner loaded they would be extremely loud, clear and go well into 30-s. You can also V-couple them or augment with "barn door" extensions, a là Funktion One Infrahorn.

 

[MaVo]

Try a tapped horn, see subwoofer forum for them.

 

[unknownuser200]

looking to just do a singal subwoofer setup any thoughts?

 

[gedlee]

First thought - DON't. Single subs never work, you need multiple subs for any decent bass performance.

 

[GM]

This thing would likely not work very well in horn, IMO.

EBP is only ~39. Horns need at least 100.........

Sorry, but with a low Fs and ~80 Hz mass corner its specs are quite good for an HT/music sub horn. Increasing its motor strength (lower Qe) just raises its mass corner/HF BW, which isn't required for an HT app.

I agree that multiples should be used though, so dividing such a large horn whether FL, BL or TH up into a number of smaller ones 'kills two birds with one stone', winding up with semi-reasonable sized bandpass subs that will sum good enough in-room down into the infrasonic BW where many of today's action movies have enough LFE to justify ultra low tunings.

GM

 

[gedlee]

I agree that multiples should be used though, so dividing such a large horn whether FL, BL or TH up into a number of smaller ones 'kills two birds with one stone', winding up with semi-reasonable sized bandpass subs that will sum good enough in-room down into the infrasonic BW where many of today's action movies have enough LFE to justify ultra low tunings.

GM

Precisely correct!

 

[MaVo]

...to justify ultra low tunings.

GM

Hi GM, what frequency do you mean with "ultra low"?

 

[GM]

Greets!

Below 20 Hz, at least to 16 Hz to cover the low B pipe organ symphonies.

GM

 

[mashaffer]

Just a slight correction. That would be a low C 32 foot stop. Organs don't have a low B pedal

 

[GM]

Thanks for the correction. Apparently most folks are as ignorant about the music scale as I was since I've erroneously posted it a number of times.

Ah well, that's what I get for repeating another's 'knowledge' without verifying it. It's four octaves below middle C (261.4 Hz based on the A = 440 Hz chart), so low C (C4) = 16.34 Hz for a 32 ft open pipe if it's diameter is big enough.

GM

 

[Scottmoose]

I suspect the floors would collapse if I tried reproducing that in my house.

 

[MaVo]

16hz would really need serious levels to be audible, judged from the levels a 25hz signal needs to be heard by me. A little lower and i just hear the suspensions flatter.

 

[mashaffer]

I have not built any but I have simulated several THs that indicate about 150 to 120dB at 16Hz using 15" or 18" pro drivers. I have to rechck my work though regarding radiating space. I just used the default in Horn Response without thinking about the actual environment.

Oh, these were fairly large For Example a JBL 2241H 18" With about a eight square foot mouth and 26.8' long line gives the sim attached. You can go smaller and still get good 32 foot pipe performance I think but my application is a built in (under floor or garage mount) with outlet in the corner.

Should be nice for playing the Digital Fox.

 

[mashaffer]

Calculated displacement.

 

[GM]

16hz would really need serious levels to be audible, judged from the levels a 25hz signal needs to be heard by me. A little lower and i just hear the suspensions flatter.

I had no trouble hearing 16 Hz at 120+dB (pegged the meter, so don't know how loud it was) back when I had dual SD Contrabass kits, but the downside was my house had no trouble shaking apart, literally, so sold them as I already have 16 Hz tuned cabs that do DD/DTS reference in-room, which is just barely audible as an undercurrent of all the stuff rattling around.

GM

 

[unknownuser200]

hmmm i see your point how about two of these

http://www.diycable.com/main/product_info.php?cPath=24_93&products_id=652

 

[unknownuser200]

or maybe 2 of these

http://woofersetc.com/index.cfm?fuseaction=product.display&product_id=2900

or these

http://www.edesignaudio.com/product_info.php?t=2&products_id=37

or these

http://www.massiveaudio.com/store/product.php?productid=16151&cat=264&page=1

sorry im not into great into HT
(car audio basshead)

just trying to get the best performance i can with out killing the bank.... sooo any sugguestion sub wise would help

 

[gedlee]

Best performance will come from several less expensive woofers. In a sub, especially when you use multiple ones, the woofer performance is not that critical so don't pay a lot for them. I bought four 8" woofers from MCM that look fine - total cost for four was $100. Use two per amp and I will use two per box and get great bass for next to nothing. Less than one of the drivers that you show.

 

[unknownuser200]

ok so mutiple low end drivers gotcha....

how about some dayton classics... i hear good things about those

http://www.partsexpress.com/pe/showdetl.cfm?&Partnumber=295-325

cheap to i could do 2 cabinets of 4 of those ^ or

http://www.partsexpress.com/pe/showdetl.cfm?&Partnumber=295-130

or 2 cabinents of 2 of these each

kinda wanna use 15's but if smaller drivers are realllly better for this appication

how about 4 10 inch peerless woofers?

http://www.partsexpress.com/pe/showdetl.cfm?&Partnumber=297-604

2 per cabinent

or these morels i know they make good stuff...

http://www.partsexpress.com/pe/showdetl.cfm?&Partnumber=297-058

or these HiVi 's

http://www.partsexpress.com/pe/showdetl.cfm?&Partnumber=297-453

im not sure what to use....


sorry im a pain the *** on the forum