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OSCA Vintage Collection

*RARE* Phoenix Gold QX500.5 Vintage Car Audio Amplifier (New-Old-Stock)
*RARE* Phoenix Gold QX500.5 Vintage Car Audio Amplifier (New-Old-Stock)
*RARE* Phoenix Gold QX500.5 Vintage Car Audio Amplifier (New-Old-Stock)
*RARE* Phoenix Gold QX500.5 Vintage Car Audio Amplifier (New-Old-Stock)
*RARE* Phoenix Gold QX500.5 Vintage Car Audio Amplifier (New-Old-Stock)

Vendor:Pheonix Gold

*RARE* Phoenix Gold QX500.5 Vintage Car Audio Amplifier (New-Old-Stock)

Sale price$375.00Regular price $599.00

Early 2000's Car Audio Phoenix Gold QX500.5 Classic USA Amplifier | New Old Stock (NOS)

The Phoenix Gold QX500.5 is a five-channel automotive power amplifier from the early-2000s QX series, when elaborate speaker arrangements and custom multi-amplifier installations were defining car audio culture. Combining four full-range channels with a dedicated subwoofer channel, it offered enthusiasts a practical way to power an entire system from one chassis. Featuring a distinctive black anodised heatsink with fly-cut fins, gold-plated connections and a PWM MOSFET power supply, the QX500.5 delivers up to 75W × 4 for speakers and 225W for a subwoofer at 2Ω. A memorable example of Phoenix Gold's turn-of-the-millennium amplifier engineering.

New Old Stock (NOS) condition: Never been installed or used beyond professional testing. Exceptionally well preserved. Original packaging and contents not included. 

All OSCA Vintage Series products have been professionally powered-on and functionally bench-tested ✅

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Product details

Advanced Specifications
  • Brand: Phoenix Gold
  • Series: QX Black
  • Model: QX500.5
  • Era: Early 2000s (2002)
  • Amplifier Configuration: 5-channel with dedicated subwoofer output
  • Power at 4Ω Stereo (14.4V): 50W × 4
  • Power at 2Ω Stereo (14.4V): 75W × 4
  • Power at 4Ω Bridged (14.4V): 150W × 2
  • Subwoofer Power at 4Ω (14.4V): 175W × 1
  • Subwoofer Power at 2Ω (14.4V): 225W × 1
  • IASCA Rating (4Ω, 12.5V): 37.5W × 4 + 150W × 1
  • Minimum Load Impedance: 2Ω (all channels)
  • Total Harmonic Distortion: Less than 0.02%
  • Frequency Response: 20Hz–20kHz (±1dB)
  • Signal-to-Noise Ratio: Greater than 100dB
  • Input Sensitivity: 200mV–4V
  • Crossover Frequency Range: 40–800Hz
  • High-Pass Crossover Slope: 12dB/octave
  • Low-Pass Crossover Slope: 12 or 24dB/octave (24dB/octave available on front input)
  • Bass Boost: Up to +15dB at 45Hz (specification table; see note below)
  • Recommended Fuses: 2 × 20A + 1 × 40A ATO-style
  • Operating Voltage: 10–15.5V DC
  • Typical Idle Current: Less than 1.5A
  • Chassis Dimensions: 19.75 × 9.5 × 2.1 inches
  • Overall Dimensions: 20.75 × 9.5 × 2.1 inches

Power figures are original manufacturer continuous output ratings at 1% THD under the specified voltage and load conditions. The manufacturer's features list states +12dB maximum bass boost, while its specifications table states +15dB.

Key Features
  • Dedicated Fifth Channel powers a subwoofer alongside four full-range speaker channels.
  • Black Anodised Heatsink features distinctive fly-cut fins and classic QX Series styling.
  • Twin-T Bass Equalisation provides adjustable low-frequency boost centred at 45Hz.
  • Adjustable Electronic Crossovers offer high-pass filtering and selectable 12 or 24dB/octave low-pass operation.
  • Remote Bass Control Compatibility supports the optional LPL44 dashboard-mounted subwoofer level controller.
  • Expandable System Connectivity supports optional RMD voltage monitoring and QLink/2 amplifier linking.
OSCA Fun Fact

Back in 2002, the Phoenix Gold QX500.5 earned a 40/50 rating and the Favourite distinction in Russian car audio magazine AvtoZvuk, whose reviewers were particularly impressed by its low distortion and stability under demanding loads.
Phoenix Gold QX500.5 Owners Manual

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