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<blockquote data-quote="Bun-Bun" data-source="post: 4826456" data-attributes="member: 584852">Looking up the T/S Paramaters...SE12&quot;Electrical Q Value -Qes: 0.49Mechanical Q Value -Qms: 4.5Total Speaker Q Value -Qts: 0.44Free Air Resonance -Fs: 25.1 HzEquivalent Compliance -Vas: 72.9 litersOne-Way, Linear Excursion -Xmax: 18 mmEfficiency -SPL 1W/1m: 86.1 dB SPLEffective Piston Area -Sd: 480 cm^2DC Resistance -Re: 2.8 ohmNominal Impedance -Znom: Dual 2/4 ohmThermal Power Handling -Pe: 600 WForce Factor -Bl: 17.7ThusQr = Qtc/Qts Vr = Qr^2-1 Vb = Vas/Vr Fb = Qr*Fs Qtc typically 0.7 (or so it says thats a good value to start with)Qr= 0.7/0.44 = 1.5909Vr = (1.5909)^2 - 1 = 1.5310Vb = 72.9/1.5310 = 47.6162Fb = 1.5909*25.1 = 39.9So your box should be 1.6816 ft^3 and will have a resonant frequency of 39.9Hz. If you want it to go lower then use a lower then use a lower Qtc (0.6 would result in 34.2Hz resonant frequency) but that will decrease power handling.EDIT: I am an idiot! that is for one sub... x2 for both. So 3.3632ft^3.</blockquote>

[QUOTE="Bun-Bun, post: 4826456, member: 584852"] Looking up the T/S Paramaters... SE 12" Electrical Q Value -Qes: 0.49 Mechanical Q Value -Qms: 4.5 Total Speaker Q Value -Qts: 0.44 Free Air Resonance -Fs: 25.1 Hz Equivalent Compliance -Vas: 72.9 liters One-Way, Linear Excursion -Xmax: 18 mm Efficiency -SPL 1W/1m: 86.1 dB SPL Effective Piston Area -Sd: 480 cm^2 DC Resistance -Re: 2.8 ohm Nominal Impedance -Znom: Dual 2/4 ohm Thermal Power Handling -Pe: 600 W Force Factor -Bl: 17.7 Thus [FONT=Courier New]Qr = Qtc/Qts [/FONT] [FONT=Courier New]Vr = Qr^2-1 [/FONT] [FONT=Courier New]Vb = Vas/Vr [/FONT] [FONT=Courier New]Fb = Qr*Fs [/FONT] Qtc typically 0.7 (or so it says thats a good value to start with) Qr= 0.7/0.44 = 1.5909 Vr = (1.5909)^2 - 1 = 1.5310 Vb = 72.9/1.5310 = 47.6162 Fb = 1.5909*25.1 = 39.9 So your box should be 1.6816 ft^3 and will have a resonant frequency of 39.9Hz. If you want it to go lower then use a lower then use a lower Qtc (0.6 would result in 34.2Hz resonant frequency) but that will decrease power handling. EDIT: I am an idiot! that is for one sub... x2 for both. So 3.3632ft^3. [/QUOTE]

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