Rockford Fosgate 12 inch R1S412 enclosure

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sonasonaaaa934

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Joined 2022
#1
trying to figure out enclosure size reports shows it hits 20 hz by many users---

https://www.amazon.in/Rockford-Fosgate-Prime-Subwoofer-R1-S412/dp/B001P804A2-specs pdf attached please download

or you can search rockford r1s412 in amazon

i just need 20 hz at good db level subwoofer in cheapest price ported or ......

trying to design in winisd

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i would prefer a enclosure around 70-90 litres but not getting proper results in winisd

i dont like 70 hz bass boom boom type only 20 hz to 40 hz what can be felt only

-----please help me enclosure size and aeroport size length
 

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#2
Basic max flat alignment:

net volume [Vb] [L] = 20*Vas*Qts'^3.3 = ~571.82 L

box tuning [Fb] [Hz] = 0.42*Fs*Qts'^-0.96 = ~15.91 Hz

Input, change this sim to 20/whatever Hz and adjust box size to flattest response to limit ~70 Hz 'boom'.

Choose vent size based on Xmax power limit @ < ~17 - 20 m/s and let WinISD calculate its length.

[Qts']: [Qts] + any added series resistance [Rs]: http://www.mh-audio.nl/Calculators/newqts.html

[Rs] = 0.5 ohm minimum for wiring, so may be higher if a super small gauge is used as a series resistor and/or there's other series resistance.
 
#3
GM said:
Basic max flat alignment:

net volume [Vb] [L] = 20*Vas*Qts'^3.3 = ~571.82 L

box tuning [Fb] [Hz] = 0.42*Fs*Qts'^-0.96 = ~15.91 Hz

Input, change this sim to 20/whatever Hz and adjust box size to flattest response to limit ~70 Hz 'boom'.

Choose vent size based on Xmax power limit @ < ~17 - 20 m/s and let WinISD calculate its length.

[Qts']: [Qts] + any added series resistance [Rs]: http://www.mh-audio.nl/Calculators/newqts.html

[Rs] = 0.5 ohm minimum for wiring, so may be higher if a super small gauge is used as a series resistor and/or there's other series resistance.
Click to expand...
thanks but 571 litres is huge box , any smaller box possible ?
 
#7
The exterior was originally 84" h x 30" w x 24" d, though currently ~49" h/~60" total, but the vent size is irrelevant since the basic cabs were built circa '69 and later highly modded into an inverse tapered TQWT (aka Voigt Pipe) and later still its terminus/mouth reduced with a removable 3/4" baffle thickness plate below the drivers, simple reflex cutout empirically determined as horn/vent tuning dropped several times from 40 Hz down to its current ~14 Hz (aka ML-TQWT).

Dual mid '50s Altec 515B, vent barely visible due to having a pet screen 'grill' tightly stretched/attached to backside. Horn is tilted down, hence its skewed 'look'.

GM's Altecs.PNG
 
#9
You're welcome!

Since I know nothing about where it will be used nor where in said space it will go nor its 'room' acoustics nor your definition of 'good dB lows' (peak SPL), then all I can say is that the huge BR box alignment I posted is required at minimum and in a sim can only handle ~15 W/Xmax/below 40 Hz = ~100 dB/m/2pi space (i.e. outdoors ground plane).
 
#10
GM said:
You're welcome!

Since I know nothing about where it will be used nor where in said space it will go nor its 'room' acoustics nor your definition of 'good dB lows' (peak SPL), then all I can say is that the huge BR box alignment I posted is required at minimum and in a sim can only handle ~15 W/Xmax/below 40 Hz = ~100 dB/m/2pi space (i.e. outdoors ground plane).
Click to expand...
my living room is 15 by 12 by 15 ft where i want to use this subwoofer - good db levels means 20 hz should be around 100 db or max possible then rolls off
-so length , breadth,height what should i use with aeroport length and diameter ?
 
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