Hertz ES 250.5

https://www.hertzaudiovideo.com/car-audio-subwoofers-energy-es250_5/

Data table
Size mm (in.) 250 (10)
Power Handling – Peak W 750
Power Handling – Continuous W 250
Impedance Ω 4
Frequency response Hz 28 ÷ 300
Sensitivity dB SPL 90
Voice coil Ø mm (in.) 50 (2)
Xmax mm 9
X-mech mm (in.) 15,5 (0.61)
Re Ω 2,9
Fs Hz 35
Vas l 27,7
Qts 0,6
Qes 0,65
Qms 9,6
Spl dB 90