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The JL Audio G4500 is a class A/B four-channel amplifier based on an Absolute Symmetry class A/B circuit.

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Pros

protection circuitry with status indicator lights

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adjustable crossover for fine tuning a custom system (2 options, apply separate settings to two pairs of speakers)

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10-25000Hz frequency response is still very good

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half the price for all of the same features

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The JL Audio G4500 is a class A/B four-channel amplifier based on an Absolute Symmetry class A/B circuit. The G4500 is the only four-channel amp in the G series, and is in direction competition with the Audio Slash V2’s 300/4v2 and 450/4v2, and the Audio HD’s HD600/4. The G4500 maintains lower power (125w per channel max versus 150/300) and an inferior frequency response (10Hz-25kHz versus 5Hz-30kHz), but supports the same damping factor (>200 @ 4 ohm). The G4500 also comes equipped with fully-variable on-board crossovers and differential-balanced inputs. Priced at $349.99, the JL Audio G4500 offers tremendous savings versus the $559.99 300/4v2, the $699.99 HD600/4, and the egregiously expensive $849.99 450/4v2, while still maintaining almost the same functionality and capability.

Features
  • Rated Power 14.4 V Stereo: 80 W RMS x 4 @ 4 ohm, 125 W RMS x 4 @ 2 ohm
  • Rated Power 14.4 V Bridged : 160 W RMS x 2 @ 8 ohm, 250 W RMS x 2 @ 4 ohm
  • Rated Power 12.5 V Stereo: 60 W RMS x 4 @ 4 ohm, 90 W RMS x 4 @ 2 ohm
  • Rated Power 12.5 V Bridged: 120 W RMS x 2 @ 8 ohm, 180 W RMS x 2 @ 4 ohm
  • THD at Rated Power:
  • S/N Ratio: >104 dB referred to rated power (A-weighted, 20 Hz – 20 kHz noise bandwidth)
  • Frequency Response: 10 Hz – 25 kHz (+0, -1dB)
  • Damping Factor: >200 @ 4 ohm per ch. / 50 Hz, >100 @ 2 ohm per ch. / 50 Hz
  • Slew Rate: ± 22V / µs
  • Input Range: 200mV – 8V RMS
  • Dimensions (L x W x H): 13.80 in. x 9.25 in. x 2.50 in.
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