Rockford Fosgate T1D215

• Sensitivity (1W, 1m, infinite baffle) SPL1W 87.9dB

Thiele & Small parameters

• Resonance frequency (free air) fS 26.3Hz
• Mechanical quality factor QMS 6.50
• Electrical quality factor QES 0.46
• Total quality factor QTS 0.43

Large signal parameters

• Maximum linear excursion xmax 16.4mm
• Air volume displaced at xmax VD 1386cm³
• Power handling P 1000W
• Program power Pmax 2000W

Voice Coil

• Nominal impedance Z 2 x 2Ω
• DC resistance (in series) RE 3.3Ω
• Inductance (1kHz, in series) LE 1.6mH
• VC Diameter 76mm

Magnet

• Force factor (in series) Bl 20.6N/A
• Motor constant Bl/√RE 11.4N/√W
• Weight 6.49kg

Diaphragm

• Effective diameter 328mm
• Effective area SD 845cm²
• Moving mass MMS 363g
• Moving mass (without air load) MMD 346g

Suspensions

• Stiffness KMS 9.9N/mm
• Compliance CMS 101µm/N
• Equivalent volume to the compliance VAS 102L
• Mechanical resistance RMS 9.22N·s/m

Dimensions

• Nominal diameter 15″
• 381mm
• Baffle cutout diameter 354mm
• Mounting depth 213mm
• Volume occupied by the driver 5.41L