trying to hit 15hz

[type[s5] 10+ year member]

160+ db at 16 hz has been been measured on a termlab. On national TV none the less.
Good luck with that.

sources?

 

[jeremiah 10+ year member]

???http://www.subwoofertools.com/forum/ported-box.asp?Ew=40&Eh=17&Dia=9&Xmax=25&Vd=0.23&NumW=1&Vb=8&Fb=13&Qts=&Vas=&Fs=&CE=0

 

[skadude016 5,000+ posts]

???http://www.subwoofertools.com/forum/ported-box.asp?Ew=40&Eh=17&Dia=9&Xmax=25&Vd=0.23&NumW=1&Vb=8&Fb=13&Qts=&Vas=&Fs=&CE=0

can you say port noise? //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[thadman 10+ year member]

I don't have time to read through 6 pages of text, so if what I've said is already been established than just ignore this post.

I already knpow you cant hear below 20hz thats why i said subsonic lowz and i also know that most music cd's dont play below 30hz so your saying that anyone who is tuned lower than 30hz is stupid???i i like what i like and thats what i want so if you cant help me out then dont coment. there are people hittin 10 and 5hz i even heard rumers of some hittin 1hz.

I think you're over emphasizing the need for low frequency content (most date in rock rarely goes below 40, rap some below 30). Keeping this in mind, its definitely feasible with the incredible cabin gain provided by cars. In fact, the smaller the vehicle the better (more cabin gain! the 12dB cabin gain boost occurs when the longest dimension of the vehicle/room is less than half the wavelength of the frequency being reproduced). I think you can get some serious output at 15hz, an Infinite Baffle setup looks like what should be in the works for you!//content.invisioncic.com/y282845/emoticons/cool.gif.3bcaf8f141236c00f8044d07150e34f7.gif

 

[Gary S 10+ year member]

What you want to do, first thing in the morning, is grease up your rear end and then take it down the highway as fast as it will go for the first four or five miles .

Seriously, unless you go with a servo sub, if you try to design a system to go that low, it probably won't sound very musical.

 

[ballstothewall 10+ year member]

;3064807']sources?

Try mythbusters did it on national tv

 

[96civ 10+ year member]

yeah, they did over 160dB at 16Hz IIRC?

 

[cecil1901 10+ year member]

I don't have time to read through 6 pages of text, so if what I've said is already been established than just ignore this post.


I think you're over emphasizing the need for low frequency content (most date in rock rarely goes below 40, rap some below 30). Keeping this in mind, its definitely feasible with the incredible cabin gain provided by cars. In fact, the smaller the vehicle the better (more cabin gain! the 12dB cabin gain boost occurs when the longest dimension of the vehicle/room is less than half the wavelength of the frequency being reproduced). I think you can get some serious output at 15hz, an Infinite Baffle setup looks like what should be in the works for you!//content.invisioncic.com/y282845/emoticons/cool.gif.3bcaf8f141236c00f8044d07150e34f7.gif

thanks for the info!

 

[dru 10+ year member]

BTW you dont drive an s13 nissan silvia.

You drive a Nissan 240sx.

 

[thadman 10+ year member]

At 15hz, you're going to want some serious deadener otherwise your car might want to shake itself apart

I'd like to clarify that cabin gain is 12dB/octave, not just 12dB.

Also, I'm more oriented towards the home theater side of audio and >120dB+ reproduction is "serious output" for me. I'm not sure what your expectations are. I modeled a pair of Dayton RSS390HFs in an IB alignment and achieved a maximum SPL of 102dB @ 15hz. I did not factor in cabin gain (20-30dB depending on your vehicle) or phase cancellation, so 20dB is probably a conservative guess. Either way, >120dB+ @ 15hz will easily be achievable.

IB installation are VERY efficient and require VERY little power to reach xmax at low frequencies, in fact 150-200 watts cumulative for both drivers will easily send them into xmax at 15hz. Please be careful and be conservative with your power, a high order HPF around 14hz would be a marvelous idea. Drivers have a thermal limit and a mechanical limit, do not assume since they handle less power that they won't get just as loud. They are achieving the same amount of displacement (displacement=SPL), just with less power

 

[budahbuddy803 10+ year member]

i dont understand i can hit 15hz i actually have a video in my sig. of a like 30-0hz sine wave and it hits all of them. what do you mean hit 15hz? cant anyone with a good sub? I have it in a sealed box and it hit 15hz

 

[cecil1901 10+ year member]

BTW you dont drive an s13 nissan silvia.
You drive a Nissan 240sx.

The 89-93 nissan silvia has the same chasis code as 89-93 240sx. the only thing differnt is the silvia comes with a sr20det and the 240sx comes with a ka24de or ka24e so i can say i am driving a silvia if i want to.. also in japan they are called silvia and in the U.S. they are called 240sx...

At 15hz, you're going to want some serious deadener otherwise your car might want to shake itself apart QUOTE]

yeah my car is in the bodyshop as we speak and am going to remove all the carpet and take out the seats. i cant decide on what deadener to get. I was planning to do the whole hatch all the way up the the front of my seat the roof and dhe doors.

 

[dru 10+ year member]

The 89-93 nissan silvia has the same chasis code as 89-93 240sx. the only thing differnt is the silvia comes with a sr20det and the 240sx comes with a ka24de or ka24e so i can say i am driving a silvia if i want to.. also in japan they are called silvia and in the U.S. they are called 240sx...

jeez you're one of those kids.

and do you even have a sr20det? a silvia also came with a ca18de and a sr20de nonturbo. I'm pretty sure you don't have any of these JDMness motors in that 240 of yours.

I'm assuming you have the ka24e which says you're driving a 240sx not a silvia by your logic.

 

[cecil1901 10+ year member]

yeah i do have the ka24det... why give up 2.4L with a iron block for a frm block... and only 2.0L??? there is no replacement for displacement boost is only an alternative....

anyway we getting off topic but i get your drift......

 

[cotjones 10+ year member]

there is no replacement for displacement

you sound like a JL audio w7 poster