Finished horn modelled with MJK's analysis worksheet

[freddi]

one more sim - a sealed box w. Niravan 8 plus the 105 liter BP4 -

http://img236.imageshack.us/img236/9333/nht105lbp4plussealedfrus7.gif

 

[GM]

Greets!

I played with this driver back when it was the Hot Ticket and it really wants to be in an IB, so a BP4 ideally needs the rear of the driver in an IB, especially in this app where the mains gets down into the 30s.

GM

 

[freddi]

oh GM - you mean a sub for Andy's horns - dunno if 1259 in a crawlspace BP4 (IB rear vented front piped into house) could do it or not.

sim

150 liter front chamber, some lining (not needed) 3 foot vent
http://img485.imageshack.us/img485/4497/nht1259crawlbp41xn8.gif

200 liter front chamber, no lining , 3 foot vent
http://img355.imageshack.us/img355/8742/nht200litercrawlqc6.gif

600 liter 4M FLH
http://img57.imageshack.us/img57/5413/nht1259600l4mflhis4.gif

 

[awhite1159]

IB? Wow GM that sounds really cool. I'm still working on WAF for this but I had a really crazy idea. I hope I can explain this without a diagram. I wanted to try IB subs for my living room and here is why.

The living room has a ceiling which when you look up at it, it resembles a horn. There is a vertical wall which has the attic behind it that is ~ 16ft tall. The ceiling comes down at about a 45 degree angle to the opposite wall where I have my TV/ home theatre system. One day I was looking up at it and because I always am thinking about horns I said "Hey that looks like a horn. What would happen if I put speakers up there kinda like a IB using the room as my FLH?" I mentioned it to my wife and she said "You need to get help. Stop thinking about horns and speakers."

Does this sound like a cool idea? I'm thinking the home theatre system already has active crossover so I wouldn't need any bandpass.

 

[GM]

Tell her it's speakers/horns or a Harley, booze n' broads, not necessarily in that order!

Yes, sub drivers up at the apex will load a bit, but the flare rate/effective length is way too fast/short to load much down in a sub's BW, though a good place to put a true sub for movie special effects and/or pipe organ symphonies.

 

[GM]

oh GM - you mean a sub for Andy's horns - dunno if 1259 in a crawlspace BP4 (IB rear vented front piped into house) could do it or not.

Yep, my old 225 W sub amp barely moved the one I played with, not surprising with such a low Qms, so should have no problem with a few hundred to thousand ft^3 rear chamber and ~2.85 ft^3 front one, but the vent may prove problematic if BoxPlot is to be believed. His ceiling 'horn' may suffice though.