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Amazon.com: Absolute Alpine R-A90S R Series 6-Channel car Amplifier 75 watts RMS x 4 at 4 ohms + 250 watts RMS x 2 at 2 ohms Bundle : Electronics
Amazon.com: KENWOOD KAC-314-4-Channel Concert Series Amplifier with 50W x 4 @ 4ohms, 75W x 4 @ 2ohms, 600W Maximum Power : Electronics
Amazon.com: Polk Audio PA D4000.4 (PAD4000.4) 800W RMS PA D Series Class-D 4-Channel Car Amplifier : Electronics
Alpine CDE-164BT In-Dash 1-DIN CD/MP3 Receiver with Bluetooth and iPhone/iPod Support With KTP-445A - Alpine 4-Channel 45W RMS X 4 at 4-Ohms Amplifier - Walmart.com
Massive Audio Ex5 Nano Edge Series 120-watt-rms X 4 At 4 Ohms + 800 Watts At 1 Ohm 5-channel Class Ab + D Hybrid Amp - Walmart.com
Kenwood 1177524 Compact Automotive/Marine Amplifier Class D Kac-M1824BT, 180W RMS, 400W PMPO, 4 Channel : Electronics - Amazon.com
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Amazon.com: Hifonics BG-1600.4 Brutus Gamma BG Series Amp (4 Channels, 1,600 Watts Max, Super A/B-Class) : Electronics
Alpine KTA-450 4-Channel Power Car Amplifier, Compact PowerStack Amp with Bracket, Ideal for iLX-W650 (sold separately): Amazon.com: Industrial & Scientific
BOSS Audio Systems Boss Nx2500.4 Onyx 2500 Watt 4-channel Mosfet Bridg – PartLimit
TractorData.com Minneapolis-Moline 335 tractor transmission information