This bundle includes the Alpine KTA-450 4-Channel Power Pack Amplifier delivering 45W RMS x 4 at 2 or 4 Ohms, the Alpine R2-S69 6x9" R-Series High-Resolution Coaxial Speakers, Pair, and the Alpine R2-S65 6.5" R-Series High-Resolution Coaxial Speakers, Pair. Alpine KTA-450 4-Channel Power Pack Amplifier, compact size of 7” W x 3.5” H x 1.25” D, Class D amplifier circuit, Dynamic Peak Power (DPP) technology, Power output of 50W RMS x 4 @ 4-Ohm and 45W RMS x 4 @ 2-Ohm, THD Less Than 0.2%, S/N Ratio >85dB, Frequency Response 15Hz - 50kHz, Input Sensitivity RCA (0.152 - 2.80V), Speaker (0.33 - 6.05V), Crossover Variable HPF/LPF, Weighs 1.3lb. Alpine R2-S69 6x9" R-Series High-Resolution Coaxial Speakers, Pair, Maximum Peak Power 300 Watts, Maximum RMS Power 100 Watts, Nominal Impedance 4 Ohm, Frequency Response 65Hz-40kHz, Sensitivity 88dB SPL (1W @ 1m), Woofer Mounting Depth 7.6cm, Woofer Cutout Diameter 14.9 x 22cm. Alpine R2-S65 6.5" R-Series High-Resolution Coaxial Speakers, Pair, Maximum Peak Power 300 Watts, Maximum RMS Power 100 Watts, Nominal Impedance 4 Ohm, Frequency Response 65Hz-40kHz, Sensitivity 88dB SPL (1W @ 1m), Woofer Mounting Depth 6.3cm, Woofer Cutout Diameter 13.5cm. Upgrade your car audio with this powerful bundle including an amplifier delivering rich sound with minimal distortion and high-resolution coaxial speakers designed for loud, clear playback. The compact amplifier is easy to install and doesn't require an extra power supply wire, perfect for tight spaces. The speakers provide Hi-Res Audio certification and feature glass-fiber reinforced cones for accurate music reproduction. Enjoy a center sound stage with power and performance matching your audio needs. Elevate your listening experience with Alpine.