I have a box already built it is 2.4 cubic feet and has a cutout for a 12 inch sub it has two 2.5 inch circles for ports how long should i make my tubes
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I have a box already built it is 2.4 cubic feet and has a cutout for a 12 inch sub it has two 2.5 inch circles for ports how long should i make my tubes
The sub and ports take up space in the box, so a 2.4 cubic foot box won't be 2.4cuft when the stuff is installed.
To know what port size you need, we need to know what kind of sub you're going with (the Thiele-Small parameters), and what frequency you want it tuned to.
51, 53, 116 on right-hand side might help you.
http://www.bcae1.com
The longer the length of the individual port tubes , the lower the frequency
What is fs of sub you will be using ?
Your port tubes may have bends to accomodate desired frequency of tuning.
WINISD , bassbox , et cetera [ enclosure design programs ]
I listen mostly to rap so it probably needs to be tuned arond 35
Vd [ft3] 0.0198 Hvc [mm] 31.6 Sd [m2] 0.052 Hvc [In] 1.24 Sd [ft2] 0.56 VC.Diameter [mm] 48 Revc [O] dual 2,9 Eff [%] 0.23 Levc [mH] (2000Hz) 4,85 (8 Ω) / 1,23 (2 Ω) S.P.L. [dB] 95 Xmax [mm] 10.8 R.M.S.Power [W] 400 Xmax [in] 0.4 M.M.P. [W] 1400 Zmax [O] 74,19 (8 Ω) / 18,6 (2 Ω) Sp. Displacement [l] 1.67 Nom. Dia.(In) 30 BI [Tm] 16,2 (8 Ω) / 8,2 (2 Ω) Sp. Displacement [ft3] 0.059 Qts 1.05 Rms[Ns/m] 3.39 Qms 13.79 Mms [g] 166 Qes 1.02 Cms [m/N] 7,6 x 10-5 F0 (in Cabinet) 55.8 Fs [Hz] 43 Mg.Wt.[g] 2100 Q0 (in Cabinet) 1.25 Vas [l] 32.7 Flux Density [Gauss] 7381 Vas [ft3] 1.15 Hag [mm] 10 Vd [l] 0.56 Hag [In] 0.39
https://www.stevemeadedesigns.com/bo...ng-fs-and-qts/
2nd post [ NDmustang65 ] . With a very high Qts (1.05) sealed box just screams at you.
http://www.ecoustics.com/electronics...io/214770.html
Fmods @ parts express are mechanical/electrical sub sonic filters.
http://www.google.com/shopping/produ...Lw_wcB#sgro=om this sub has a 28 Hz Fs and is 4 ohm. The power of your ZA amp .will work well.
http://www.jlaudio.com/12w3v3-4-car-...-drivers-92154
We are talking a low Fs = 26 Hz and we get the 500 bridged watts. :snap:
According to WinISD, tuned to 35hz and each port lengths of 8-3/16" would give you a 6db hump around 60hz
Attachment 6313
Tuned to 40hz with ports of 1-7/8 would give you a 7.5 db gain at 58hz
Attachment 6314
Did you figure any boxes with 2 1/2 inch ports ? Port "chuffing" being my concern.
http://www.rockler.com/2-1-2-clear-p...AaAh2REALw_wcB
Possibility of pipe for ports ^^^^^^^^^^4
Dsaulen0902,
Getting it sorted ?
Or , hopelessly confused ?
BOTH of them are configured with 2-1/2" ports...or more specifically, 2.68" ports, which is the closest size that appears in the drop-down menu of the program. The program also takes chuffing into consideration, and the highest of them shows a vent mach of .15, which is the upper limit. (yet is why the result is green and not red)
Awesome job , Al. !
yes i am getting it. learned alot past couple days.I am going to build a newbox with my dimensions I figured I will have 1.76 cft net with a 3" diam X 6.5 inch long tube it will be tuned to 35 hrz. Thx for all the help
I am going to build a new box with my dimensions I figured I will have 1.76 cft net with a 3" diam X 6.5 inch long tube it will be tuned to 35 hrz. Thx for all the helpI am going to build a new box with my dimensions I figured I will have 1.76 cft net with a 3" diam X 6.5 inch long tube it will be tuned to 35 hrz. Thx for all the helpI am going to build a new box with my dimensions I figured I will have 1.76 cft net with a 3" diam X 6.5 inch long tube it will be tuned to 35 hrz. Thx for all the help
Dsaulen0902,
Using that sub ? If you play "through" Fs ( or natural resonating frequency ) your ears will tell you [ NOT GOOD ].
Ok now im confused again You trying to confuse me LOL... If im getting this correctly you are saying i should tune it more like 40hz closer to the subs Fs. Will i be disapointed in the bass for the rap music.. I do also listen to hard rock. Tell me what you would recommend for my enclosure.
Without knowing what brand or model of sub it is (you never said), the numbers suggest that it would work best with a large sealed enclosure.
The fs of his sub is 43hZ , he is fucked Al ! Unless he picks a sub with an Fs around 30 Hz or lower as far as rap goes.
i have not purchased this sub yet only my amp can u recommend something good and cheap as i am on a fixed income i appreciate all the help!! if i didn't mention the amp it is an MB Quart ZA2-1000.4 The only reason I had my heart set on this sub was the price $60 and it was DVC so it could could be wired multiple ways but it is not going to work for the music we listen to
That^
or http://www.soundqubed.com/HDS2.112
Euphonic, nice!
Tune to 28 Hz in 3.5 cu. Ft.
that dayton looks like it would work and its right around my price range but its 250 rms my amp is 500 rms im still looking and still thankful for the input
How about this one Kenwood KFC-W3016PS
https://www.parts-express.com/kenwoo...362_E_G100-200
Looks great, can you do 2.0 cu ft @ 28Hz ?
thats the one im gonna go with i found it for 58 bucks What a deal. Thx again guys when i get it and install it all will let you know how it went.
OK, ported ?
thats what the manuf sug 2.0 ported
Yes, scroll down on sub and you will see `optimum` using "Bass Box 6" , for a vented/ported box. The subsonic filter is used {mechanical/electronic} so when sub unloads beneath tuned frequency, the sub doesn`t destroy itself.
my amp does not have a SSF or is that wht you are calling my high pass filterAttachment 6326
I cant seem to find the Thiele-Small parameters anywhere for the driver displacement for Kenwood KFC-W3016PS
Try searching here or email em, call em. http://www.kenwood.com/usa/
If you set the highpass to 22-25 Hz it will only allow frequencies higher than that to go to sub. Many guys use a lowpass filter for their sub set to somewhere between 100-80 Hz, so the sub will only play notes below that frequency. Go here to look up subsonic filter http://www.bcae1.com/
Analogy for a subwoofer unloading , a vehicle in neutral or park. Floor it, there is `no load` , it will sound GREAT until the rpms reach the red line, then the motor blows!
so your saying if i set my highpass to 60Hz (Which is the lowest setting) It will stop sending anything below 60 Hz to the woofer. Hows that work?
BCAE or basic car audio and electronics will essplain filters ?
The slope of the cross over attenuates the output .
Slopes are 6 , 12 , 18 , 24 , et cetera .
The steeper the slope the sooner the lack of output or attenuation .
http://www.bcae1.com
Number 27 on right side ( scroll down )
Amplifier with subsonic filter - 24 dB @ 25 hertz https://www.hifisoundconnection.com/...MaAtkWEALw_wcB
would these work??? https://www.amazon.com/FMOD-Crossove...2FRW921EKCVTFT
What radio do you have? If it has flexible crossover adjustments, could use the subwoofer settings to control your upper cutoff, or LPF, then use the HPF of the amp turned all the way down to 30Hz to create a pretty basic subsonic filter.
Yup! Those will work. your ZA will give you 500 watts bridged on that sub and Al figured, 8 or so inch length gets you around 35 hZ for both holes (2 1/2)with about 6 dB bump around 60 hZ frequency (I Think).
A lil bit longer on the port tubes will drop the tuned frequency down .
Your Fmods will go in between the head unit and the amplifier , RCA's
It's a Kenwood KDC-118 and yes it has an bass adjustment on it that ranges from 60Hz-200Hz Mid adj that ranges from .5KHz-2.5KHz and Tre adj that ranges from 10.0 KHz-17.5KHz. Also volume offset range -8 to 0, Loudness off 1 & 2.. and Bass Boost off 1 & 2.....
OK correct me if I'm wrong but the SSF should be set a half octive above the 35 Hz The enclosure is tuned to. which should be 52.5 Hz OR 17.5 Hz
You're confusing me telling me to set my HPF to 30Hz as you can see it only goes down to 60Hz
Attachment 6328
Ahhhh... my idea won't work then.
Dsaulen0902,
If you are using ch 1&2 for subwoofer , the switch should be set to LPF and then start out around 80 hZ .
If you are using ch 3&4 for front speakers set the switch to HPF and start around 100 hZ.
You will need to listen to a song you know extremely well ( your favorite ). Does it sound the way you know that it should ?
http://www.kenwood.com/usa/car/recei...-118/spec.html