This, That, but which really?

lcpunk69
10+ year member

SQ Baby!
Some people tell me putting a 12" XXX in 2.4CBFT with a port tuned about 33hz is more for SQ and tuning at 45-50HZ will be good daily SPL. Some people say the box is too small, some people say it will be good, but all I want is the loudest SPL subwoofer I can fit into about 2.4cbft, leaning more towards a 12" sub cuz smaller and usually can give it the recommened box siize as where a 15" usually needs 3+ which I cant offer. Also the only advantage a 15" has is the ability to player lower frequencies right?

 
Originally posted by Audio N00B tune it to the resonant frequency of your car
I would love the explanation for this.....a resonant frequencies for a given object are frequencies that will create standing waves in the medium. First off, standing waves should be avoided and are because the wavelength of the frequencies we are talking about is so larger and most people dont wave there car "waving".....I watched a bright go into a standing wave and collapse because the wind hit the resonant frequency of the medium.....so why even if there were a single resonant frequency for your vehicle why would you want to tune to it? there is not a single one because each different medium will resonant at different frequencies and multiples of those frequencies. Thats why certain songs may cause that annoying vibration, but no other song does.....

to answer the guys question, I would run that 12 in your 2.4 cu foot box and tune it around 30hz....the 45-50 range is usually used for SPL comps because most subs have the greatest effeciency in that range, but thats not real condusive to daily driving.

 
Originally posted by evo2k3 to answer the guys question, I would run that 12 in your 2.4 cu foot box and tune it around 30hz....the 45-50 range is usually used for SPL comps because most subs have the greatest effeciency in that range, but thats not real condusive to daily driving.
exactly what i told lc on AIM //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 
Originally posted by evo2k3 I would love the explanation for this.....a resonant frequencies for a given object are frequencies that will create standing waves in the medium. First off, standing waves should be avoided and are because the wavelength of the frequencies we are talking about is so larger and most people dont wave there car "waving".....I watched a bright go into a standing wave and collapse because the wind hit the resonant frequency of the medium.....so why even if there were a single resonant frequency for your vehicle why would you want to tune to it? there is not a single one because each different medium will resonant at different frequencies and multiples of those frequencies. Thats why certain songs may cause that annoying vibration, but no other song does.....

 

to answer the guys question, I would run that 12 in your 2.4 cu foot box and tune it around 30hz....the 45-50 range is usually used for SPL comps because most subs have the greatest effeciency in that range, but thats not real condusive to daily driving.
What this guy is saying is true. There is no certain frequency at which every material in your car will resonate, unless your entire car is made out of the same material. However, I think what the guy meant by "Resonant Frequency" in this case is the car's "loud note", which is often referred to as its resonant frequency.

These "loud notes" do exist. Usually they fall between 45 and 70 hz. Any SPL'er will tell you that if you plan to compete it is important that you find this note. I don't know the exact scientific explaination as to why certain vehicles play certain frequencies better than other ones, however I think it has something to do with the distance from the sub to the reflecting surface (windshield, dashboard, floorboard, etc). I spent months finding the "golden note" of my Talon before I even started constructing the box. The idea is to find this note, and tune the box to where it will peak exactly at this note.....but this isn't as easy as it sounds, trust me!

At any rate, unless you plan to use the box for SPL only, you don't want to tune your sub that high. It will be far more efficient (thus louder), as the guy said, but it will also sound like ass. For daily driving, you should never tune your box higher than 45hz unless you really want your system to sound awful.

 
Originally posted by evo2k3 I would love the explanation for this.....a resonant frequencies for a given object are frequencies that will create standing waves in the medium. First off, standing waves should be avoided and are because the wavelength of the frequencies we are talking about is so larger and most people dont wave there car "waving".....I watched a bright go into a standing wave and collapse because the wind hit the resonant frequency of the medium.....so why even if there were a single resonant frequency for your vehicle why would you want to tune to it? there is not a single one because each different medium will resonant at different frequencies and multiples of those frequencies. Thats why certain songs may cause that annoying vibration, but no other song does.....

 

to answer the guys question, I would run that 12 in your 2.4 cu foot box and tune it around 30hz....the 45-50 range is usually used for SPL comps because most subs have the greatest effeciency in that range, but thats not real condusive to daily driving.
sorry, i just stole it from the website jees. //content.invisioncic.com/y282845/emoticons/rolleyes.gif.c1fef805e9d1464d377451cd5bc18bfb.gif

 
Originally posted by lcpunk69 So a RE XXX 12" 2.4cf ported tuned at about 38fz would be nice? Im mostly leaning towards SPL, but not competitions
Yes. You will have a higher peak, probably around 41 Hz or so, which will give you more SPL than a box tuned lower. But it's good for daily driving.
Also, 2.4 cubes is good for a 12" XXX, RE recommends 2.25 for SQL, so 2.4 is good...

 
What would get "louder" the Ed15a powered by a ed nine.1 in about 2.4cft tuned at 35hz

or the RE 12" xxx powered by a better audio 1500W RMSx1 @1ohm in about 2.4cbft tuned to about 35hz or so...

 
Originally posted by lcpunk69 What would get "louder" the Ed15a powered by a ed nine.1 in about 2.4cft tuned at 35hz

 

or the RE 12" xxx powered by a better audio 1500W RMSx1 @1ohm in about 2.4cbft tuned to about 35hz or so...
Well, I can't speculate, haven't yet heard the ED A, not too many people have...
You'd be running close to the same power, about 1300 watts from the ED to 1600 from the BA. It would be very close because that 300 watt difference will be made up by the larger cone area of the 15", it would be very close.

 
on team gates web site they quoted that the loudest spl frequencys are under 100hz so correct me if i am wrong but how would the sq frequency turn out if the box tuned at an unexpected number

 
loudest under 100? if i recall their bronco in its hay day was doing 174's 6 yrs ago with tens tuned somewheres in the 120-150 hz range or maybe a lil higher..i also recall a friend of mine with 50 some odd 8's doing mid 170's back then at 250 hz but the week of the finals they decided to filter out 80 hz on up that 170+ score became 156 real quick

 
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lcpunk69

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