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Car Amplifiers Comparison

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Rockford Fosgate R2-300X4
Prime Series 4-channel car amplifier — 50 watts RMS x 4
$219.99
  • 150 watts RMS x 2 bridged
  • variable high- and low-pass filters
  • preamp and speaker-level inputs
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Alpine KTP-445A Power Pack
Compact upgrade amplifier for your Alpine receiver — 45 watts RMS x 4
  • dimensions: 7-7/8"W x 1-1/2"H x 2-9/16"D
  • compact amplifier for Alpine in-dash receivers
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Alpine KTA-450 Power Pack
Compact 4-channel car amplifier — 50 watts RMS x 4
  • 100 watts RMS x 2 bridged at 4 ohms
  • Dynamic Peak Power (DPP) technology adds a burst of power when needed
  • PowerStack bracket included for mounting amp behind Alpine iLX-W650 digital multimedia receiver (#500ILXW650)
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Rockford Fosgate Prime R400-4D
4-channel car amplifier — 75 watts RMS x 4
Temporarily out of stock
42 reviews

$219.99 Sale: -$20.00 off

$199.99
  • 200 watts RMS x 2 bridged
  • variable high- and low-pass filters
  • preamp inputs and outputs
       
Condition New Stock New Stock New Stock New Stock
Performance Rockford Fosgate R2-300X4 Alpine KTP-445A Power Pack Alpine KTA-450 Power Pack Rockford Fosgate Prime R400-4D
RMS Power Output (Wt x Channels) 50 x 4
45 x 4
50 x 4
75 x 4
Peak Power Output (Wt x Channels) --- 90 x 4 100 x 4 ---
Power at 2 Ohms (Wt x Channels) 75 x 4 N/A 45 x 4 100 x 4
Bridged Power (Wt x Channels) 150 x 2 N/A 100 x 2 200 x 2
Minimum Impedance Bridged 4 N/A 4 4
Minimum Impedance Unbridged 2 2 2 2
Best Frequency Response --- 20-20k Hz 15-50k Hz 20-20k Hz
THD at Rated RMS Power --- 1% 1% 1%
Signal to Noise Ratio --- 84 dB 82 dB 90 dB
Input Voltage --- 14.4v 14.4v 14.4v
Features Rockford Fosgate R2-300X4 Alpine KTP-445A Power Pack Alpine KTA-450 Power Pack Rockford Fosgate Prime R400-4D
Amplifier Class AB D D D
Low-Pass Crossover Frequency 50-250 Hz N/A No 50-250 Hz
Low-Pass Slope (dB/octave) 12 dB/octave N/A N/A 12 dB/oct
High-Pass Crossover Frequency 50-250 Hz N/A Off, 60, 80, 120Hz 50-250 Hz
High-Pass Slope (dB/octave) 12 dB/octave N/A 12 dB/octave 12 dB/oct
Bass Boost 0, 6, 12 dB No No 0-18 dB
Bass Boost Frequency 45 Hz N/A N/A 45 Hz
Fan Cooled --- No No No
Fuse Rating 50 15 20 40
Speaker Level Inputs Harness Harness RCA No
Preamp Outputs No No No 1 pair
Width (inches) 13-1/4 7-7/8 7 9-1/8
Height (inches) 2 1-1/2 1-3/8 2
Depth (inches) 7-3/8 2-9/16 3-9/16 7-3/8
Parts Warranty 1 Year 1 Year 1 Year 1 Year
Labor Warranty 1 Year 1 Year 1 Year 1 Year
  Owner's Manual Owner's Manual Owner's Manual Owner's Manual
Hands-on Research Hands-on Research Hands-on Research Hands-on Research
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Rockford Fosgate R2-300X4
Prime Series 4-channel car amplifier — 50 watts RMS x 4
$219.99
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Alpine KTP-445A Power Pack
Compact upgrade amplifier for your Alpine receiver — 45 watts RMS x 4
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Alpine KTA-450 Power Pack
Compact 4-channel car amplifier — 50 watts RMS x 4
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Rockford Fosgate Prime R400-4D
4-channel car amplifier — 75 watts RMS x 4
Temporarily out of stock
42 reviews

$219.99 Sale: -$20.00 off

$199.99
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