MTX THUNDER65 6.5" 2-WAY 60-WATT RMS 4Ω COAXIAL SPEAKER PAIR Rich Bass The THUNDER65 is a 6.5" 2-way coaxial speaker pair that can handle up to 60-watts RMS power. THUNDER speakers are set apart from the "other guys" because of its ability to reproduce low frequencies that other speakers cannot reproduce. No Subwoofer Required! While no car speaker can produce bass like a subwoofer, these speakers truly shine in the lower frequencies. The THUNDER Series Coaxial offers it all.