Zaph|Audio - ZA14W08 Woofer

GENERAL Model No ZA14W08 Frame OD 138 mm Frame ID 114 mm Frame thk 4.5 mm Mounting depth 66 mm Nominal Impedance 8 ohms Thermal power handling 60 W continuous Free air resonance 65 ± 10 Hz Sensitivity 87 ± 2 dB/W/M, 2.83 V Weight 1100 grams CONE Cone material Aluminum Surround material Rubber VOICE COIL Diameter 25.4 (mm) Length 10.5 (mm) Layers 2 Former material Aluminum Wire material Copper MAGNET Diameter 100 (mm) Height 15 (mm) Weight 442 (g) Gap(H) 4 (mm) PARAMETERS DC resistance Re: 7.1 (ohms) Resonance frequency Fs: 65.835 (Hz) Maximum impedance Zm: 32 (ohms) Mechanical Q factor Qms: 2.1318 Electrical Q factor Qes: 0.5584 Total Q factor Qts: 0.4425 Equivalent volume Vas: 5.23 (l) Moving mass Mms: 7.200 (g) Sensitivity SPL: 87 (dB) BL product Bl: 6.154 Effective radiating diameter D: 95 (mm) Effective radiating area Sd: 68 (cm^2) Voice Coil Inductance Le(1K): 0.37 (mH) Linear Displacement Xmax: 3.25 (mm) (one way)

Design Features:

Strategically placed Faraday rings in the motor allow for low non-linear distortion and limited inductance change through the voice coil's range of travel.

A formed aluminum alloy cone provides very flat response within its passband and a breakup node that is high in frequency for extended usable bandwidth.

Machined aluminum phase plug eliminates compression and reflection that would normally occur under a dustcap and promotes cooling of the voice coil.

Tinsel leads are mounted to opposite sides of the voice coil former to promote even cone loading.

Rigid cast metal frame of an open design includes ventilation under the raised spider.

Flat linear spider provides uniform restoring force throughout the voice coil's range of travel.

Integrated gasket for airtight seal and vibration resistance.

Frequency response, infinite baffle, 2.83v, 1m

Harmonic distortion, 96dB at 1/2 meter, 2nd thru 5th order

Impedance Y-axis zoom

Le(x) - inductance change with cone clamped at full inward and outward excursion

Frequency response, infinite baffle, 2.83v, 1m, 12 random samples

Frequency response, infinite baffle, off axis, 0,15,30,45,60 degrees

Measurement conditions:

Frequency response and harmonic distortion are taken on an infinite baffle. The rear of the driver opening has been chamfered for airflow. Drivers broken in at full Xmax with 15Hz tone for 10 hours then allowed to fully cool. Vas calculated with delta compliance method for accuracy, with a rigid 4.5 liter enclosure used to generate the delta impedance. Sd was calculated using the diameter of half the surround with the phase plug area subtracted.

A deeper look at this driver and the creation of it can be seen in the Design Details section.

© Zaph Audio LLC, 07/31/2009