AI-Sonic S1-Series 6×9″ 2-way component speaker system with coaxial option. You can easily remove the ″face plug″ and install tweeter instead to make this speaker coaxial! Sandblasted stainless steel basket. Black pressed paper cone, rubber surround. 1″ ASV voise coil. 20mm Silk dome neodymium tweeter. 2-way passive crossover with rubber housing. – Impedance 4 Ohm – – Tweeter crossover 12dB / oct – Midbass crossover 6dB / oct – Crossover cutoff 4900Hz – Power recommendation 30-150W – Sensitivity 90dB – Woofer outer diameter 235/164mm – Woofer mounting diameter 213/150mm – Woofer mounting depth with rubber 56,5mm – Tweeter outer diameter 36mm – Tweeter mounting 33mm – Tweeter mounting depth 8,7mm