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Recommend box size for single Alpine SWR-1241D
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<blockquote data-quote="Tungsten" data-source="post: 110918" data-attributes="member: 546239"><p>I started playing around with WinISD and a few others again and came up with a Vb of 0.416 cubic-feet for the Alpine SWR-1021D subwoofer to achieve a Qtc of .71</p><p></p><p>That sounds small. Is my math right? Thiele/Small parameters for this sub are as follows:</p><p></p><p><strong>Alpine SWR-1021D</strong></p><p></p><p>Coil Height (Hvc) : 36.7mm</p><p></p><p>Cone Area (Sd) : 320.47 sq. cm</p><p></p><p>D.C.Coil Resistance (Re) : 1.8 ohm + 1.8 ohm</p><p></p><p>Electrical Q (Qes) : 0.40</p><p></p><p>Equivalent Suspension Stiffness (Vas) : 29 liters(1.02cu.ft.)</p><p></p><p>Free Air Resonance (Fs) : 29Hz</p><p></p><p>Frequency Response : 28Hz - 1kHz</p><p></p><p>Gap Height (Hag) : 10mm</p><p></p><p>Impedance (Nominal) : 2 ohm + 2 ohm</p><p></p><p>Inductance (Le) : 2.67mH at 1kHz (0.88mH at 20kHz)</p><p></p><p>Linear Excursion (X linear) : 13.35mm</p><p></p><p>Maximum Excursion (X peak) : 26.7mm</p><p></p><p>Mechanical Excursion (Peak-to-Peak) : 55mm</p><p></p><p>Mechanical Q (Qms) : 8.93</p><p></p><p>Sensitivity : 85 dB/W/M</p><p></p><p>Total Loudspeaker Q (Qts) : 0.38</p></blockquote><p></p>
[QUOTE="Tungsten, post: 110918, member: 546239"] I started playing around with WinISD and a few others again and came up with a Vb of 0.416 cubic-feet for the Alpine SWR-1021D subwoofer to achieve a Qtc of .71 That sounds small. Is my math right? Thiele/Small parameters for this sub are as follows: [B]Alpine SWR-1021D[/B] Coil Height (Hvc) : 36.7mm Cone Area (Sd) : 320.47 sq. cm D.C.Coil Resistance (Re) : 1.8 ohm + 1.8 ohm Electrical Q (Qes) : 0.40 Equivalent Suspension Stiffness (Vas) : 29 liters(1.02cu.ft.) Free Air Resonance (Fs) : 29Hz Frequency Response : 28Hz - 1kHz Gap Height (Hag) : 10mm Impedance (Nominal) : 2 ohm + 2 ohm Inductance (Le) : 2.67mH at 1kHz (0.88mH at 20kHz) Linear Excursion (X linear) : 13.35mm Maximum Excursion (X peak) : 26.7mm Mechanical Excursion (Peak-to-Peak) : 55mm Mechanical Q (Qms) : 8.93 Sensitivity : 85 dB/W/M Total Loudspeaker Q (Qts) : 0.38 [/QUOTE]
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