Driver : Alpine Type R 12"
Vas : 45.0
Qts : 0.47
Fs : 29.00
SPL : 85.00
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Project by : Owner
Project for : you
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Number of drivers : 1
Box type : Vented
Box size : 70.8 l
Tuning frequency : 28.16 Hz
Vent : 1 vent(s)
0.351 m length for each
0.102 m round
Relative
Freq Gain Phase SPL
[Hz] [dB] [deg] [dB]
20.00 -10.55 254.96 101.44
25.00 -2.70 211.80 109.29
30.00 0.93 163.62 112.92
35.00 1.48 128.78 113.47
40.00 1.28 106.84 113.27
45.00 1.04 91.99 113.03
50.00 0.85 81.12 112.84
55.00 0.70 72.72 112.69
60.00 0.59 65.99 112.58
65.00 0.51 60.45 112.50
70.00 0.44 55.79 112.43
75.00 0.38 51.83 112.37
80.00 0.34 48.40 112.33
85.00 0.30 45.41 112.29
90.00 0.27 42.77 112.26
95.00 0.24 40.43 112.23
100.00 0.22 38.34 112.21
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Generated with WinISD[0.44] freeware (C) Juha Hartikainen
You can download your own copy from : https://www.linearteam.org
GAIN
GROUP DELAY
PHASE PLOT
SPL
This Alpine Type R dual 4 ohm subwoofer will be powered by an Alpine 500 watt amp (@ 2 ohms). I was just wondering if this box would suffice.
Opinions?
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Sasquatch...
We know your legend's real...
that should sound pretty good...I always like type R's in ported enclosures between 2.5 - 3 cu ft
Likely to be more than that due to cabin gain (if you set the system up to achieve such a goal, that is...).
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Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
Is setting your cabin gain when you get an o-scope and the whole nine yards to get super SQ?
If it has to do with that I wasn't really going for that. I was just trying to design a box to make the woofer be really dynamic.
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Sasquatch...
We know your legend's real...
I meant that you were referring to SPL, not SQ, in asking about decibel level. All the little details of the system work together to maximize SPL.
The modelling program doesn't account for cabin gain and doesn't know what frequency it will boost; therefore the cabin gain isn't detailed on the SPL chart. If the program shows 110 db at an attainable power level, the real-life level will surpass that because of the gain in decibels created by the (relatively small) car environment.
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Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
Oh okay. Well I was going for more of a sound quality box but would like it to be loud. From the look of those charts do you think it'll sound good?
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Sasquatch...
We know your legend's real...