Recommended for professional audio as a woofer in vented enclosures. Also good for horn loading and scoops.
|Nominal Basket Diameter||18", 457.2mm|
|Nominal Impedance*||4 ohms|
|Usable Frequency Range||40Hz - 0.8kHz|
|Magnet Weight||109 oz.|
|Gap Height||0.37", 9.53mm|
|Voice Coil Diameter||4", 101.6mm|
|Thiele & Small Parameters|
|Resonant Frequency (fs)||23Hz|
|DC Resistance (Re)||2.5|
|Coil Inductance (Le)||0.61mH|
|Mechanical Q (Qms)||6.41|
|Electromagnetic Q (Qes)||0.29|
|Total Q (Qts)||0.28|
|Compliance Equivalent Volume (Vas)||639 liters / 22.6 cu.ft.|
|Peak Diaphragm Displacement Volume (Vd)||556cc|
|Mechanical Compliance of Suspension (Cms)||0.34mm/N|
|BL Product (BL)||13.4 T-M|
|Diaphragm Mass Inc. Airload (MMs)||145.5 grams|
|Efficiency Bandwidth Product (EBP)||79|
|Maximum Linear Excursion (Xmax)||4.8mm|
|Surface Area of Cone (Sd)||1159 cm2|
|Maximum Mechanical Limit (Xlim)||16mm|
|Recommended Enclosure Volume|
|Vented||99-193 liters / 3.5-6.8 cu.ft.|
|Driver Volume Displaced||403.9 cu.in. / 6.62 liters|
|Overall Diameter||18", 457.2mm|
|Baffle Hole Diameter||16.56", 420.5mm|
|Front Sealing Gasket||Fitted as standard|
|Rear Sealing Gasket||Fitted as standard|
|Mounting Holes Diameter||0.28", 7.1mm|
|Mounting Holes B.C.D.||17.25", 438.2mm|
|Net Weight||25.2 lbs, 11.4 kg|
|Shipping Weight||28.9 lbs, 13.1 kgs|
|Materials of Construction|
|Coil Construction||Copper voice coil|
|Coil Former||Polyimide former|
|Magnet Composition||Ferrite magnet|
|Core Details||Vented and extended core|
|Basket Materials||Die-cast aluminum basket|
|Cone Composition||Paper cone|
|Cone Edge Composition||Cloth cone edge|
|Dust Cap Composition||Solid composition paper dust cap|
* Please consult www.eminence.com for specifications of models with alternative impedances.
** Multiple units exceed published rating evaluated under EIA 426A noise source and test standard while in a free-air, nontemperature-controlled environment.
*** The average output across the usable frequency range when applying 1W/1m into the nominal impedance. ie: 2.83 V /8 ohms, 4 V /16 ohms. Eminence response curves are measured under the following conditions: All speakers are tested at 1W/1m using a variety of test set-ups for the appropriate impedance | LMS using 0.25" supplied microphone (software calibrated) mounted 1m from wall/baffle | 2 ft. x 2 ft. baffle is built into the wall with the speaker mounted flush against a steel ring for minimum diffraction | Hafler P1500 Trans-Nova amplifier | 2700 cu. ft. chamber with fiberglass on all six surfaces (three with custom-made wedges).
**** BETA 8CX, 10CX, 12CX and ACOUSTINATOR™ CX 2008 are coaxial speakers with tweeter sold separately. Published Usable Frequency response contingent upon use of APT 50 HF Driver.
***** Multiple units exceeded published rating evaluated under AES 500 and AES 800 noise sources and test standards while mounted on Eminence's TI-2000 horn in a nontemperature-controlled environment.
****** The average on axis output across the entire usable frequency range when applying 1W/1m into the nominal impedance while mounted on a Community SH 494 horn measured with: LMS (software calibrated) using a 0.25" [6.4mm] supplied microphone mounted 1m from horn mouth, Hafler P1500 Trans-Nova amplifier, 2700 cu.ft. chamber w/fiberglass on all six surfaces (three with custom made wedges). Plane-wave tube response and impedance curves measured with LMS on a 0.75" [19.1mm] diameter tube with adapter to allow for smooth transition to throat diameter and 1W/1m into nominal impedance. Prices and Specifications Subject to Change Without Notice.