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Car Amplifiers Comparison

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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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Sony XMS400D
Compact 4-channel car amplifier — 45 watts RMS x 4
  • non-bridgeable, only works with 4- to 8-ohm speakers
  • switchable high- and low-pass filters
  • speaker-level inputs
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Alpine KTP-445U Power Pack
Compact 4-channel car amplifier — 45 watts RMS X 4
  • 90 watts RMS x 2 bridged
  • switchable RCA or speaker-level inputs
  • selectable high-pass filters
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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)
       
Condition New Stock New Stock New Stock New Stock
Performance Alpine KTP-445A Power Pack Sony XMS400D Alpine KTP-445U Power Pack Alpine KTA-450 Power Pack
RMS Power Output (Wt x Channels) 45 x 4
45 x 4
45 x 4
50 x 4
Peak Power Output (Wt x Channels) 90 x 4 100 x 4 90 x 4 100 x 4
Power at 2 Ohms (Wt x Channels) N/A N/A 45 x 4 45 x 4
Bridged Power (Wt x Channels) N/A N/A 90 x 2 100 x 2
Minimum Impedance Bridged N/A N/A 4 4
Minimum Impedance Unbridged 2 4 2 2
Best Frequency Response 20-20k Hz 20-20k Hz 20-20k Hz 15-50k Hz
THD at Rated RMS Power 1% 1% 1% 1%
Signal to Noise Ratio 84 dB 83 dB 82 dB 82 dB
Input Voltage 14.4v 14.4v 14.4v 14.4v
Features Alpine KTP-445A Power Pack Sony XMS400D Alpine KTP-445U Power Pack Alpine KTA-450 Power Pack
Amplifier Class D D D D
Low-Pass Crossover Frequency N/A 120 Hz N/A No
Low-Pass Slope (dB/octave) N/A 12 dB/octave N/A N/A
High-Pass Crossover Frequency N/A 120 Hz 60, 80, 120Hz Off, 60, 80, 120Hz
High-Pass Slope (dB/octave) N/A 12 dB/octave 12 dB/oct 12 dB/octave
Bass Boost No No No No
Bass Boost Frequency N/A N/A N/A N/A
Fan Cooled No No No No
Fuse Rating 15 15 15 20
Speaker Level Inputs Harness Harness Harness RCA
Preamp Outputs No No No No
Width (inches) 7-7/8 7-1/4 7-7/8 7
Height (inches) 1-1/2 1-1/2 1-1/2 1-3/8
Depth (inches) 2-9/16 2-1/2 2-9/16 3-9/16
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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Alpine KTP-445A Power Pack
Compact upgrade amplifier for your Alpine receiver — 45 watts RMS x 4
Remove

Adding...
Top Seller
Sony XMS400D
Compact 4-channel car amplifier — 45 watts RMS x 4
Remove

Adding...
Alpine KTP-445U Power Pack
Compact 4-channel car amplifier — 45 watts RMS X 4
Remove

Adding...
Alpine KTA-450 Power Pack
Compact 4-channel car amplifier — 50 watts RMS x 4
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