The Celestion FTR18-4080FD 18" pro woofer features a rigid, yet acoustically optimized cast aluminum frame and a specially treated and weather-resistant cone. Its 1,000 watt RMS power rating is achieved largely by the use of a 4" high temperature Inside/Outside voice coil that efficiently dissipates heat and prevents sensitivity loss through thermal compression. Extensive venting through the frame and motor structure also improves reliability. The FTR18-4080FD's exclusive Flexirol™ surround and double suspension guarantee exceptional linearity, even at the highest excursions.
Product Specifications
Nominal Diameter: 18"
Power Handling: 1,000 Watts RMS
Power Handling: 2,000 Watts max
Impedance: 8 ohms
Frequency Response: 30 to 2,500 Hz
Sensitivity: 97 dB 2.83V/1m
Voice Coil Diameter: 4"
Magnet Weight: 110 oz.
Thiele-Small Parameters
Resonant Frequency (Fs): 25.2 Hz
DC Resistance (Re): 5.6 ohms
Voice Coil Inductance (Le): 1.5 mH
Mechanical Q (Qms): 4.75
Electromagnetic Q (Qes): 0.3
Total Q (Qts): 0.28
Compliance Equivalent Volume (Vas): 14.43 ft.³
Mechanical Compliance of Suspension (Cms): 0.23 mm/N
BL Product (BL): 22.81 Tm
Diaphragm Mass Inc. Airload (Mms): 177.8g
Moving Mass Of Diaphragm (Mmd): 150.8
Maximum Linear Excursion (Xmax): 6 mm
Surface Area of Cone (Sd): 855 cm²
Materials of Construction
Cone Material: Paper / Glass Fiber
Surround Material: Cloth
Voice Coil Wire Material: Copper
Voice Coil Former: Fiberglass
Basket / Frame Material: Cast Aluminum
Magnet Material: Ferrite
Mounting Information
Overall Outside Diameter: 18.19"
Baffle Cutout Diameter: 16.38"
Depth: 8.07"
# Mounting Holes: 8
Sealed Volume: 0.64 ft.³
Sealed F3: 108.1 Hz
Vented Volume: 1.49 ft.³
Vented F3: 99.32 Hz
Shipping Information
Shipping Dimensions (L x W x H): 19.7" x 19.7" x 9.4" inches
Shipping Weight: 27 lbs.