Celestion TF1225 8 ohm 12" Bass/Mid Driver Pressed Steel Chassis/Ferrite Magnet

Description:

12-inch pressed steel chassis, ferrite magnet bass/mid driver.

Specifications:

• Nominal diameter: 305mm / 12in
• Power rating: 250W
• Continuous power rating: 500W
• EIA power rating: 400W
• Rated impedance: 8Ω
• Sensitivity: 97dB
• Frequency range: 50-4000Hz
• Chassis type: Pressed steel
• Magnet type: Ferrite
• Magnet weight: 1.2kg / 42oz
• Voice coil diameter: 64mm / 2.5in
• Voice coil material: Round copper
• Former material: Polyimide
• Cone material: Kevlar loaded paper
• Surround material: Cloth-sealed
• Suspension: Single
• Gap height (Hg): 8mm / 0.31in
• VC winding height (Hvc): 13mm / 0.51in
• Additional impedances: 4Ω

Mounting Information:

• Overall diameter: 309mm / 12.17in
• Overall depth: 130mm / 5.1in
• Cut-out diameter: 283mm / 11.14in
• Mounting hole dimensions: 7.9mm / 0.31in Ø
• Number of mounting holes: 4
• Mounting hole PCD: 297mm / 11.69in
• Unit weight: 4.1kg / 9.0lb

Packed Dimensions & Weight:

• Single pack size W x D x H: 330mm x 330mm x 150mm / 13in x 13in x 5.9in
• Single pack weight: 4.6kg / 10.1lb

Parameters:

• Sd: 530.93cm2 / 82.29in2
• Fs: 55.60Hz
• Mms: 48.52g / 1.71oz
• Qms: 3.112
• Qes: 0.420
• Qts: 0.370
• Re: 5.08Ω
• Vas: 67.27l / 2.38ft3
• BI: 14.32Tm
• Cms: 0.17mm/N
• Rms: 5.45kg/s
• Le (at 1kHz): 0.86mH
• Xmax: 4.5mm / 0.18in

Measurement Notes:

• Power rating: Tested for two hours using a continuous, band-limited pink noise signal as per AES standard. Power calculated on minimum impedance. Loudspeaker tested in free air.
• Continuous power rating: Defined as 3dB greater than the AES rating.
• Sensitivity: Measured on axis at 1W, 1m in 2π anechoic environment.
• Parameters: Measured after unit subjected to pre-conditioning signal.
• Xmax: 0.5*(Hvc-Hg) + 0.25*Hg