Scanspeak 22W/8534G00 Discovery 8″ Woofer

Below are the test results from the Scanspeak 22W/8534G00 Discovery 8″ Woofer.

I purchased two drivers and tested both in the small signal suite.  I only tested one driver for large signal results.


IMG_8774 IMG_8775



Small Signal Results:

Driver 1 Driver 2
Electrical Parameters
Re 5.94 5.95 Ohm electrical voice coil resistance at DC
Le 0.33 0.322 mH frequency independent part of voice coil inductance
L2 0.631 0.71 mH para-inductance of voice coil
R2 2.39 2.52 Ohm electrical resistance due to eddy current losses
Cmes 400 380 µF electrical capacitance representing moving mass
Lces 54.65 46.74 mH electrical inductance representing driver compliance
Res 37 32.27 Ohm resistance due to mechanical losses
fs 34 37.8 Hz driver resonance frequency
fm 27.9 31.1 Hz resonance frequency of driver with additional mass
Mechanical Parameters
(using add. mass)
Mms 27.015 26.544 g mechanical mass of driver diaphragm assembly including air load and voice coil
Mmd (Sd) 22.944 22.473 g mechanical mass of voice coil and diaphragm without air load
Rms 1.823 2.166 kg/s mechanical resistance of  total-driver losses
Cms 0.81 0.669 mm/N mechanical compliance of driver suspension
Kms 1.23 1.5 N/mm mechanical stiffness of driver suspension
Bl 8.213 8.36 N/A force factor (Bl product)
Loss factors
Qtp 0.439 0.454 total Q-factor considering all losses
Qms 3.167 2.909 mechanical Q-factor of driver in free air considering Rms only
Qes 0.509 0.537 electrical Q-factor of driver in free air considering Re only
Qts 0.438 0.453 total Q-factor considering Re and Rms only
Other Parameters
Vas 63.3215 52.2728 l equivalent air volume of suspension
n0 0.471 0.505 % reference efficiency (2 pi-radiation using Re)
Lm 88.93 89.23 dB characteristic sound pressure level (SPL at 1m for 1W @ Re)
Lnom 90.22 90.52 dB nominal sensitivity (SPL at 1m for 1W @ Zn)

Discovery 22w_8534g00 imp


Large Signal Results:

Displacement Limits thresholds can be changed in Processing property page
X Bl @ Bl min=82% 4.4 mm Displacement limit due to force factor variation
X C @ C min=75% 4.7 mm Displacement limit due to compliance variation
X L @ Z max=10 % >6.0 mm Displacement limit due to inductance variation
X d @ d2=10% 29 mm Displacement limit due to IM distortion (Doppler)
Asymmetry (IEC 62458)
Ak -17.67 % Stiffness asymmetry Ak(Xpeak)
Xsym 0.8 mm Symmetry point of Bl(x) at maximal excursion

Discovery 22w_8534g00 bl Discovery 22w_8534g00 bl symmetry Discovery 22w_8534g00 cms Discovery 22w_8534g00 kms Discovery 22w_8534g00 kms symmetry Discovery 22w_8534g00 lx Discovery 22w_8534g00 li

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