Originally Posted by
FE3T
This 2245H was measured with a S&L Woofertester 2
At the time measurement was done the driver was just reconed with one of the last oem kits sold in Norway by me.
Meaasured with the driver in horisontal position, screved too woden blocks positioning it 4" above the floor.
Test mass was a roll of duct tape weigthed on a kitchen scale.
As seen there are some parametres that are suspicious. MMS are very high (More than tvice the real weigth of the cone Assembly), Vas are low, BL are very high, and Qms are high.
I vaguely remember somone claimed that the 2245H are very difficult too get dependable measurements of.
so i use factory specs for my simulations rather than trusting DATS or WT2.
The driver are currently in use in a 8cuft cabinet ported too 26hz, 6db boost at 26hz Q=2
20Hz 24db/oct HP. 50hz 18db/oct LP. Performs great.
Buffer[1] Vas Ver 7.01
Completed: Sat Jul 16 20:11:52 2016
Drive level 100.000% [3.417 mA]
Sine,LoZP(LV/LA)->Vas,19 pts
;------------------------------------------------------------------
Re = 5.0568 ohms
Fs = 19.2550 Hz
Zmax = 158.7390 ohms
Qes = 0.2330
Qms = 7.0824
Qts = 0.2256
Le = 1.3190 mH (at 1 kHz)
Diam = 400.0000 mm ( 15.7480 in )
Sd = 125663.7126 mm^2(194.7791 in^2)
Vas = 507.3981 L ( 17.9186 ft^3)
BL = 28.1596 N/A
Mms = 302.0576 g
Cms = 226.1853 uM/N
Kms = 4421.1528 N/M
Rms = 5.1598 R mechanical
Efficiency = 1.4605 %
Sensitivity= 93.6630 dB @1W/1m
Sensitivity= 95.6551 dB @2.83Vrms/1m
Krm = 9.195E-03 ohms Freq dependent resistance
Erm = 702.906E-03 Rem=Krm*(2*pi*f)^Erm
Kxm = 16.504E-03 Henries Freq dependent reactance
Exm = 711.469E-03 Xem=Kxm*(2*pi*f)^Exm
;------------------------------------------------------------------
Ftest = 12.005 Hz
Ftest/Fms = 0.6235
Test Mass used = 475.0000 g (Equal to 95.0 nickels)
Test Mass (Ft=Fms*0.90) = 70.853 g (Add -404.147g for Ft=17.329)
Test Mass (Ft=Fms*0.75) = 234.934 g (Add -240.066g for Ft=14.441)