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Post by mannthey on Sept 26, 2005 22:15:38 GMT -7
From GR Research. I am not sure who makes is but GR Research dosen't sell junk stuff.
SW-12A parameters: Mechanical Parameters: * Fs = 20.5 hertz * Qms = 4.85 * Vas = 3.56 cu.ft or 101 liters * Cms = 0.057 in/Ib * Mms = 5.964 oz or 169.1 grams * Rms = 9.843 Ibs/sec * Xmax = 16 mm * Sd = 72.5 sq.in or Dia = 9.6 in or 244 mm Electrical Parameters: * Qes = 0.440 * Re = 6.7 ohms * Le = 5.16 mH * Z = 8.0 ohms * BL = 18.5 * Pe = 200.0 watts Combination Parameters: * Qts = 0.40 * Sens = 87.03 dB (2.83 V)
I just happened onto the driver and thought others might want to know.
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Post by ThomasW on Sept 27, 2005 2:17:04 GMT -7
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Post by mannthey on Sept 27, 2005 9:43:04 GMT -7
Is there a list of suggested reqirments for an IB driver. I didn't know an Le of 5.16 mH was bad for IB.
So far I know xmax > 10 Qts < .5
Thanks.
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Post by ThomasW on Sept 27, 2005 10:29:52 GMT -7
It's higher than I'd want for any alignment, let alone an IB. The goal is to have a low Le, that's why I linked to the thread about the new RS drivers from PE.
Xmax, 14-16mm or higher. Qts, around 0.5, Fs, midteens is nice. Vas, low is nice but not mandatory depending on the particular install
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Post by mannthey on Sept 27, 2005 11:01:59 GMT -7
Lower vas == lower distortion? 2 12's are better than 1 15? Cost not a factor.
It seems to me with an IB the power is low to the driver (IE the motor dosen't work as hard) distortion caused by the larger cone area would not be a big factor.
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Post by ThomasW on Sept 27, 2005 11:49:43 GMT -7
Nope, but generally speaking the lower the Le the lower the distortion Not necessarily just depends on the T/S of the drivers. 2-12"s will give roughly 30% more displacement than a single 15". So buying multiple 12"s to get the same displacement as a pair of 15"s isn't a cost effective approach.
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