I want a subwoofer flat from 10hz-40hz

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#85
Thanks! I guess I could have figured that out.

Hey SIMON5......check out the thread "Folded" Sonotube TL Sub Complete!....last post of mine for an idea that might help you guys out.

I could also use your expertise and help in picking out the perfect driver.

Sorry for highjacking Steve....but you might take some ideas from the folded tranmission line. I think it would help you keep things flat.

C
 
#89
"You'll get 124 dB flat to 10 Hz with it in a 35 cu.ft ported box tuned to 10 Hz if you corner load it."

"room gain is pretty signifcant if I can figure out a corner load"

Couple of things - there's a droop in max SPL between Fb and some higher freq (probably ~20 Hz in this case) where power limited output takes over again from excursion liomited output.

I don't believe corner loading works in the pressure region below the first room mode freq.

"The other reallity check is that you will not hear this in all or even most places due to room modal points. Dead spots."

In a 15 ft room the lowest mode is 37 Hz, so the bass should get increasingly less location dependent as freq decreases from here.
 
#91
I don't think Fs is as much of a problem as you think, so long as your box is large enough. I am waiting for my 15" Avalanche recone...and no doubt it will have a better responce with it's 15.7Hz Fs, I am listening to a 15" MOFO...quite the opposite of the Ava...in the Ava's home. 5.2 cubes tuned to 20Hz. It sounds pretty damn deep to me, most impressive when playing below it's Fs of 33.5Hz.

I think a XXX would sound vary comparable to a low Fs driver such as a Tumult, Brahma, or Avalanche. I know it will need more work EQing the FR than the other naturals...but I think it's do-able.
 
#92
I think Tumult has extremely low distortion especially at very low frequencys. While you can hear distortion in most subs when they're going full tilt at 10-20hz, Tumult simply doesnt distort until it bottoms out and at 34+mm excursion one way you get quite a bit of LF displacement
 
#93
I certainly hope you don't have your heart set on a reflex port to tune the enclosure, unless you like some nice loud chuffing to go with your bass. The Two-AV15 option with some AE Speakers 18" PRs is what you want. While John hardly has the time anymore to respond to technical questions, Deon Bearden (formerly of Klipsch, and the originator of some positively absurd DIY sub projects) has joined league with John at AE Speakers and would certainly be able to add a few ideas of his own as to how you could accomplish this feat of low frequency with AE Speakers products. Go to http://www.aespeakers.com and click on the 'forum' link, and post your question. Ignore the gripes about turn-around time on Lambda series speakers - they take so long b/c they're handbuilt to-order, and it takes time to get them through all the stages of the process. Customers don't realize that the hand-built, built-to-order Lambda series speakers are going to take so long, so they raise heck all day long. You will want two 18" passive radiators for each AV15 woofer, when you get down that low because the passive radiators really start sweeping some volume.
 
#94
#95
This project is clearly pointless for an apartment. You should build 2 of these systems, incorporate it into a vertical placement midi pipe organ system and donate it to a cathedral. You could really make a difference to their accurate reproduction of 17th century sound! Now that would be something!

I think this would be more in spirit of diyaudio. Anyone claiming to require more than 110dB in an apartment clearly has no concept of volume levels, not to mention ignorance of long term health damage.

Sorry mate, you asked for it :whazzat:
 
#96
DUDE 110db at 20hz and below is not loud nor dangerous. Come on

For a large church there would be a need for much greater SPL than you expect. For the extremely low frequencys of a pipe organ this will require huge displacement capabilitys. Here only such a thing like a dcservo motor "fan" or whatever other alternative technology would work.

Is there a reason why that pipe is 64' long on that pipe organ? uhhh yeah
 
#99
I will say I'm not conviced either way when it comes to hearing loss from LF sounds, BUT I dont listen to 110db+ Continuously. Peaks get up there and I expect my system to perform there like it's at idle and NOT strain the speakers for the loudest listening level. Permanant Hearing loss from <110db isnt such a concern anyways and at low frequencys I would suspect even less of a concern

If anyone knows any "proof" on hearing loss(clynical studies or something) post!
 
#100
I'm about to build a 130 litre subwoofer tuned to ~17 Hz. The enclosure will be 130*30*35 cm. I will be using 4 ports, two on both ends of the enclosure. The ports will be about 1-1.2 metres long. I will first try four 8" Tangband woofers and if they aren't good enough I will change them to one 12" or 15" driver.

I'm afraid that the long enclosure might act like ML-TL which will boost frequencys around 66 Hz. Also the long ports will boost frequencys around 71.

The cut off frequency will be about 50 Hz. Do I have to worry about these quarter wave resonances?
 
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