going subsonic

[liftedcj7on44s 10+ year member]

What is needed? alot of cone area, big box tuned pretty low right?

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[JohnEJanowitz 10+ year member]

subsonic technically means slower than the speed of sound. Infrasonic is technically the word you're looking for. We have lots of people doing some serious SPL's down to 10Hz in home theaters with IB subwoofers. http://www.aespeakers.com/phpbb2/viewtopic.php?f=14&t=1624 Look around on the forum for a few others also, but his has measurments.

In a vehicle it is much easier. You have a lot of extra cabin gain to work with meaning you need a lot less power and displacement. This Escort for example has around 35dB of cabin gain at 10Hz with all windows up:

It doesn't take a lot to hit some high levels at 10Hz with that kind of gain.

John

 

[fasfocus00 5,000+ posts]

what is really the point of going below 20hz? you can't even hear anything below 20hz.

 

[JohnEJanowitz 10+ year member]

Our ears can't physically hear it, but we can feel it through bone conduction. Much of our low frequency "hearing" isn't heard through the ear canal. Plug your ears when at a fireworks show. The low frequency information is still there.

John

 

[djman37 5,000+ posts]

he wants to go boom like so.

 

[wasted911 10+ year member]

A lot of people ask me why I have an 18" woofer tuned so low in my living room. Sure your ears can't hear 15 hertz.. but can your body ever freakin feel it. The best thing I've ever done was tune retardedly low.

 

[liftedcj7on44s 10+ year member]

ive always prefered to tune low personally.

My plan is to(assuming i can get my hands on 1 or 2)run 1 or 2 lms ultras 18's.

put them in roughly 9 cubes and tune in the 20's

 

[snoopdan 5,000+ posts]

Good example of this can easily be seen in the wall in my Jeep. Even with the subsonic filter on some, while playing Sarah Mclaughlin's "River" (which is compeltely voice and piano only song) you can actually tell that the piano is a precussion instrument. You dont hear the wave as much as feel it. Its very odd to initially hear a piano peice like that on some 18's //content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif

 

[liftedcj7on44s 10+ year member]

basically what i am after. snoop i know you hate TC but you think 2 lms ultra 18's in 9 cubes tuned to say 25 hz is gonna do the trick? remember the 18 has an fs of 19hz.

 

[BrianChia 10+ year member]

Yeah, it is much easier in a car. Home audio guys struggle with huge boxes and long ports to bring sub 30hz up to the same reference level as the rest of the music. It's not uncommon to see tuning in the 15hz range for HT setups. In a small car you can tune to 30hz and still get an F3 at 20hz. Imagine what tuning at 20hz would do.

Deep infrasonic bass is just one of those exhilarating experiences that can be very fulfilling. 150db at 50hz is sure impressive, but you really appreciate the air moving power of 120db at 20hz.

 

[liftedcj7on44s 10+ year member]

yep i want to move alot of air!!!!!

 

[NMBR1SPT 10+ year member]

I wanna see this lifted CJ on 44s

 

[BrianChia 10+ year member]

basically what i am after. snoop i know you hate TC but you think 2 lms ultra 18's in 9 cubes tuned to say 25 hz is gonna do the trick? remember the 18 has an fs of 19hz.

I think this should do the job pretty nicely. What type of car is this going in?

 

[liftedcj7on44s 10+ year member]

95 grand cherokee.

on the liftedcj7on44s deal, i get asked this alot. this SN is from like 4 years back. i dont have the jeep anymore. i stretched the frame 9 inches, ran dana 60 front and rear. well the frame didnt hold and basically broke in half so i ditched it but never changed my SN.

 

[NMBR1SPT 10+ year member]

95 grand cherokee. on the liftedcj7on44s deal, i get asked this alot. this SN is from like 4 years back. i dont have the jeep anymore. i stretched the frame 9 inches, ran dana 60 front and rear. well the frame didnt hold and basically broke in half so i ditched it but never changed my SN.

LOL I'm puttin 38in mud grapplers on my ram check the builds