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Post by ThomasW on Apr 9, 2014 7:01:42 GMT -7
OK, thanks for clarifying the situation.
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Post by staffcurtis on Apr 11, 2014 6:13:36 GMT -7
Exactly! I am in a quandary, but I can wait if this sub will satisfy my needs. $162 each with no shipping cost is much better than $234 plus $50 shipping on the FI. The FI would have to be twice as good for that price. If I were only buying two then maybe, but I'm buying 16! Things can add up quickly with that. I wonder if FI would give me a break on a qty price?
Regards
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Post by ThomasW on Apr 11, 2014 6:26:21 GMT -7
Just for reference what are your main speakers?
They better be massive because if the mains are too small to keep up with the output from the sub, it's rather pointless to buy 16 of anyone's IB drivers
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Post by electrodynamic on Apr 22, 2014 22:09:57 GMT -7
Exactly! I am in a quandary, but I can wait if this sub will satisfy my needs. $162 each with no shipping cost is much better than $234 plus $50 shipping on the FI. The FI would have to be twice as good for that price. If I were only buying two then maybe, but I'm buying 16! Things can add up quickly with that. I wonder if FI would give me a break on a qty price? Regards If your buying decision is based on Xmax alone [without regard to any other form of performance like T/S measurements] you may want to look at other woofers besides our HT series. |
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Post by ThomasW on Apr 23, 2014 7:33:09 GMT -7
Here are the T/S parameters for both 18" drivers. One must remember the Fi driver is specifically designed for IB use, so it's T/S parameters will of course be different than those of a general purpose sub.
18" D2
Re: 3.5 Ohms
Fs: 17 Hz
Qes: 0.41
Qms: 5.8
Qts: 0.38
Le: 3.2 mH
Sd: 117841 mm^2
Vas: 411.9 l
BL: 19.7
Mms: 416 g
Cms: 208.8
Sensitivity (1W/1m): 88.7 dB
Xmax: 22.5mm
IB318
SINGLE 2 | SINGLE 4
Fs: 22.3 Hz | 22.5 Hz
Re: 1.5 Ohms/coil | 2.8 Ohms/coil
Qms: 3.33 | 3.41
Qes: ..81 | .77
Qts: .65 | .62
Mms: 272g | 270g
Sd: 1210cm^2 | 1210cm^2
Vas: 381 l | 381 l
Spl: 89.1dB 1W/1m | 89.4dB 1W/1m
Bl: 8.43 N/A | 11.8 N/A
Xmax: 30mm
Rms: 550W @ 20Hz
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Post by electrodynamic on Apr 27, 2014 20:42:26 GMT -7
Here are the T/S parameters for both 18" drivers. One must remember the Fi driver is specifically designed for IB use, so it's T/S parameters will of course be different than those of a general purpose sub. 18" D2 Re: 3.5 Ohms Fs: 17 Hz Qes: 0.41 Qms: 5.8 Qts: 0.38 Le: 3.2 mH Sd: 117841 mm^2 Vas: 411.9 l BL: 19.7 Mms: 416 g Cms: 208.8 Sensitivity (1W/1m): 88.7 dB Xmax: 22.5mm IB318 SINGLE 2 | SINGLE 4 Fs: 22.3 Hz | 22.5 Hz Re: 1.5 Ohms/coil | 2.8 Ohms/coil Qms: 3.33 | 3.41 Qes: ..81 | .77 Qts: .65 | .62 Mms: 272g | 270g Sd: 1210cm^2 | 1210cm^2 Vas: 381 l | 381 l Spl: 89.1dB 1W/1m | 89.4dB 1W/1m Bl: 8.43 N/A | 11.8 N/A Xmax: 30mm Rms: 550W @ 20Hz For an IB alignment it is pretty safe to model both woofers in a 300 ft^3 sealed enclosure, as that size sealed enclosure is at least what a woofer would see when mounted in a truly IB alignment. Even entertaining the theoretical response plots generated by those woofers in an anechoic chamber (WinISD) with zero room gain you can see that the drivers are close in terms of sheer output. Keep in mind the latter is without regard to inductance issues on the fi driver because fi doesn't list the inductance of their IB3 woofer. We (SI) do list Le. fi does not list Le. For their SSD series [which may/should have a shorter coil than the ib series] the Le:Re is 2.8x. For our drivers the Le:Re is 1.08x. |
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