Check the listing for details. Celestion TF0818MR 8" inch Professional Midrange Speakers Closed Sealed Back 2pc. Condition: New. Listed at 127.98 USD. Celestion's TF0818MR 8" professional midrange speaker features and integrated sealed chassis that isolates the driver's diaphragm a companion woofer's "back pressure", which eliminates the need to construct a separate sub-enclosure. The TF0818MR produces high-SPL, low distortion reproduction of the all-important frequency range. It features a 1.75" high-temp voice coil and a 31 oz. ceramic ferrite magnet, which contribute to the driver's very high output and low distortion. Product Specifications Nominal Diameter 8"Power Handling (RMS) 100 WattsPower Handling (max) 200 WattsImpedance 8 ohmsFrequency Response 800 to 5,000 HzSensitivity 99 dB 2.83V/1mVoice Coil Diameter 1.75"Magnet Weight 20 oz. Thiele-Small Parameters Resonant Frequency (Fs) 450 HzDC Resistance (Re) 6.7 ohmsVoice Coil Inductance (Le) 0.34 mHTotal Q (Qts) 6.7 Materials of Construction Cone Material Paper / KevlarSurround Material Treated PaperVoice Coil Wire Material CopperVoice Coil Former Kapton® / PolyimideBasket / Frame Material SteelMagnet Material Ferrite Mounting Information Overall Outside Diameter 8.19"Baffle Cutout Diameter 7.2"Depth 3.35"# Mounting Holes 4 Part Number 294-2056UPC 739894527842