[Czilla9000]

www.audiobahninc.com (click on products, subwoofers, and then linear compression)

Shouldn't the 34'' sub go lower than 10Hz? The Bag End Infra18 (18'') does 8 Hz.

 

[KTpG]

How low it really goes depends mostly on the enclosure and tuning (if using vented enclosure).

 

[Whitebread]

It's an Audiobahn. Its a car woofer. They have a stupid high fs, low Xmax and generally are just designed to go down to maybe 30hz and play off the 20+db of cabin gain. But this is only for the most part though. I can name a few drivers that can out displace a tumult or have t/s specs of a quality home audio driver.

About that 34 inch sheebe, I bet it distorts from the first watt. it's probably only designed for SPL.

 

[Czilla9000]

I posted this just for fun. I don't plan on building a subwoofer untill I get my fullrange bookshelves done (which means my supplier needs to get the enclosures in stock).


BTW, what do all those "T/S Parameters" mean? What things do I want higher numbers on and what things do I want lower numbers on?



From what I understand the Adire Audio Tumult is king - the current best music sub in the world - correct?

 

[Voodoochile]

Quote:

Originally posted by Whitebread About that 34 inch sheebe, I bet it distorts from the first watt. it's probably only designed for SPL.

And designed to operate at 1 or 2 ohms... I'd say you are correct! Ouch.

 

[jeffreyj]

What I want to know, is, how in the hell are drivers with 41 pound magnets and just under 3 feet in diameter supposed to fit on your head?!?!

 

[Whitebread]

Quote:

Originally posted by Czilla9000 I posted this just for fun. I don't plan on building a subwoofer untill I get my fullrange bookshelves done (which means my supplier needs to get the enclosures in stock). BTW, what do all those "T/S Parameters" mean? What things do I want higher numbers on and what things do I want lower numbers on? From what I understand the Adire Audio Tumult is king - the current best music sub in the world - correct?

Full range bookshelves? Isn't that kinda an oxymoron?

Anyway, the tumult is not the bass king. MTX audio makes a 15 incher with 55mm of linear excursion 1 way. The Tumult is rated at 34mm 1 way. Plus the MTX is much more sensative. I was designed to produce serious SPL, more than was the Tumult can do. But I'd take a tumult over it anyday.

There is also another driver, an 18' one that uses the same XBL2 technology that the Tumult with some crazy amount of linear excusion. Resonant Engineering makes the driver. I believe it has more linear excursion than both the Tumult and that MTX driver. But they changed their site and haven't compleated it yet.

Those are the only 2 drivers I can think of right now that can out displace a Tumult.

Although there is another driver in development by TC sounds, I think, with another company, that is suposted to have about 4 inches of linear excusrion 1 way. I can't imagine how loud that would be.


About the T/S parimaters. It stands for Theil/Small. I use them to model drivers in a certain box. Now, I said that the parimeters should be changed cause most car divers have poor ratings. I bet the FS is somewhere around 40hz. This is not good as it places a very difficult load in front of the amp at frequencies below 40hz. And it only gets more difficult as it gets lower. Other things like mechinical, electrical and overall system dampening are probably too low or too high, making for a bad sounding system. Last thing is Vas, Car subs are designed to operate in small enclosures. That MTX driver has a as of like 20 liters. The Tumults vas is rated at 160 liters and that is considered low.


Edit: here is a link to the Resonant Engineering site: http://www.respl.com/

 

[Whitebread]

Quote:

Originally posted by jeffreyj What I want to know, is, how in the hell are drivers with 41 pound magnets and just under 3 feet in diameter supposed to fit on your head?!?!

Ever heard of Texas Headphones??????

 

[Whitebread]

Quote:

Originally posted by Voodoochile And designed to operate at 1 or 2 ohms... I'd say you are correct! Ouch.

Yep

 

[Czilla9000]

Was this the MTX you were talking about? How do you think it competes sound quality wise to the Tumult?


http://www.mtxaudio.com/caraudio/pro...oofers/RFL.cfm



Hmmm....MTX says they did not design it for SQ, so I guess the Tumult is the best woofer when it comes to SQ.

 

[Whitebread]

Yep that's it. It creates more distortion than it does pleasent sound. It's not designed to sound good. Also, the amount of displacement the Tumult has is way more than enough for Home Theater and can handle any music you can throw at it. If you go any louder, I guarentee that the neighbors will not be happy. People I know have gotten 130+ db over about 30 hz in a 1000 square foot room with 1 tumult in a 5 cubic foot 3 passive radiator enclosure. That's more than enough.

 

[Voodoochile]

Check out the 'El Pipe-O' article by Nelson Pass in Audio Express (about three months ago?). The built a pait of line-transmission bass enclosures from sonotube for 2 pair of massive woofers.

Then they had a little party after anchoring down or relocating all the knick-knacks in the house. It's pretty funny, but the integrity of the sound was still there, at least.

I figure if you want loud noise, and don't care about the quality... hang out at the airport. Or go to a db drag.

It's not for me, personally... but is intruiging. I read the Wired article a year ago which mentioned Alma Gates and a few others; it's a different world. The main interviewee had a van with an intermediate system, including a very heavy sub with a tone generator of sorts. This was rigged up to what he called "The Burp Button". You press the big red button, and a ridiculously loud tone at some given frequency would emanate for a few seconds, making your hair fly up and around, setting off car alarms, and also supposedly the frequency was harmonious with women's genitalia. Needless to say, he did not observe too many spontaneous orgasms... mostly just rude looks. Bizzare.

 

[Whitebread]

I read about a woman who was inside one of these vans when they were competing. The woofers were punping out about 150 db and the woman was in there for almost a minute. She became completely deaf, both ear drums ruptured, and a good amount of her tissues were very badly dammaged. If I remember right, 2 or 3 of them failed and they had to be removed. The others (all of them) were harmed greatly. I think she lived though, but was severly disabled. She was in her 20s too.

 

[Dusty Chalk]

Quote:

Originally posted by Czilla9000 Shouldn't the 34'' sub go lower than 10Hz? The Bag End Infra18 (18'') does 8 Hz.

Only because the Bag End has a special processor (read: EQ) that boosts the lower frequencies, compensating specificly for the driver's capabilities.

(I.E. for every db that the driver tapers off in the lower frequencies, the EQ boosts a db.)

 

[Whitebread]

Eq can only cancel out roll off to a point. Remember that to play an octave lower, a driver has to move 4 times the air. When you get real low (read 20hz and lower) the octaves go by really quick, and the amount of air that needs to be moved increases very fast. Despite the fact that the driver is 18", I highly dought that it it's -3db point is 8 hz. Nothing gets around Hoffmans iron law, you can't defy physics.