Orion XTR2500.4 XTR Series 2,500 Watts RMS 4-Channel Bridgeable Xtreme Amp Class AB Stereo High Performance Car Speakers Amplifier with Free Alphasonik Earbuds ORION XTR 4 CHANNEL AMPLIFIER 8000W MAX AMPLIFIER ORION XTR 4 CHANNEL AMPLIFIER 8000W MAX ORION XTR2000.4