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Frequently Compared Car Amplifiers

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Rockford Fosgate Prime R250X1
Mono subwoofer amplifier — 250 watts RMS x 1 at 2 ohms
Low stock
32 reviews
$139.99
  • 150 watts RMS x 1 at 4 ohms
  • variable low-pass filter and bass boost
  • preamp and speaker-level inputs
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Rockford Fosgate R500X1D
Prime Series mono subwoofer amplifier — 500 watts RMS x 1 at 2 ohms
  • 300 watts RMS x 1 at 4 ohms
  • variable low-pass filter and bass boost
  • speaker-level inputs and preamp outputs
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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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JL Audio JX500/1D
Mono subwoofer amplifier — 500 watts RMS x 1 at 2 ohms
  • 300 watts RMS x 1 at 4 ohms
  • variable low-pass filter (50-200 Hz, 12 dB/octave)
  • preamp and speaker-level inputs
       
Condition New Stock New Stock New Stock New Stock
Performance Rockford Fosgate Prime R250X1 Rockford Fosgate R500X1D Alpine KTA-450 Power Pack JL Audio JX500/1D
RMS Power Output (Wt x Channels) 150 x 1
300 x 1
50 x 4
300 x 1
Peak Power Output (Wt x Channels) N/A N/A 100 x 4 ---
Power at 2 Ohms (Wt x Channels) 250 x 1 500 x 1 45 x 4 500 x 1
Bridged Power (Wt x Channels) N/A N/A 100 x 2 ---
Minimum Impedance Bridged N/A N/A 4 N/A
Minimum Impedance Unbridged 2 2 2 2
Best Frequency Response 20-250 Hz 20-250 Hz 15-50k Hz 10-150 Hz
THD at Rated RMS Power 1% 1% 1% 1%
Signal to Noise Ratio 80 dB 80 dB 82 dB 62 dB
Input Voltage 14.4v 14.4v 14.4v 14.4v
Features Rockford Fosgate Prime R250X1 Rockford Fosgate R500X1D Alpine KTA-450 Power Pack JL Audio JX500/1D
Amplifier Class AB D D D
Low-Pass Crossover Frequency 50-250 Hz 50-250 Hz No 50-200 Hz
Low-Pass Slope (dB/octave) 12 dB/octave 12 dB/octave N/A 12 dB/oct
High-Pass Crossover Frequency N/A N/A Off, 60, 80, 120Hz N/A
High-Pass Slope (dB/octave) N/A N/A 12 dB/octave N/A
Bass Boost 0-12 dB 0-12 dB No 0-12 dB
Bass Boost Frequency 45 Hz 45 Hz N/A 45 Hz
Fan Cooled No No No No
Fuse Rating 30 50 20 50
Speaker Level Inputs Harness Harness RCA Harness
Preamp Outputs 1 pair 1 pair No 1 pair
Width (inches) 11-1/4 8-1/2 7 7-7/8
Height (inches) 2 2 1-3/8 2-1/8
Depth (inches) 7-3/8 7-3/8 3-9/16 7-11/16
Parts Warranty 1 Year 1 Year 1 Year 2 Years
Labor Warranty 1 Year 1 Year 1 Year 2 Years
  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 Prime R250X1
Mono subwoofer amplifier — 250 watts RMS x 1 at 2 ohms
Low stock
32 reviews
$139.99
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Top Seller
Rockford Fosgate R500X1D
Prime Series mono subwoofer amplifier — 500 watts RMS x 1 at 2 ohms
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Alpine KTA-450 Power Pack
Compact 4-channel car amplifier — 50 watts RMS x 4
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JL Audio JX500/1D
Mono subwoofer amplifier — 500 watts RMS x 1 at 2 ohms
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