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The Yamaha PX5 Power Amplifier is a two-channel Class-D amp for the engineer who wants the speaker processing built into the rack rather than bolted on as a separate box. It delivers 500 watts a side into 8 ohms and 800 watts a side into 4 ohms, with crossover, EQ, delay and limiting handled on board. In a plain black two-unit chassis weighing 6.9 kilograms, it is the piece that turns a pair of passive cabinets into a tuned system.
Each channel puts out 500 watts into 8 ohms or 800 watts into 4 ohms. Bridge the pair in Power Boost mode and you get a single channel of 800 watts into 8 ohms or 1,400 watts into 4 ohms for driving a sub. The output stage is Class D with a balanced BTL circuit, frequency response is flat within 1 dB from 20 Hz to 20 kHz, and the signal-to-noise ratio is 100 dB A-weighted.
Yamaha's D-CONTOUR multi-band dynamic processing sits on the inputs with FOH/MAIN, MONITOR and OFF settings, shaping the low end differently depending on whether the cabinet is out front or on the floor as a wedge. Behind it is a proper speaker processor with a 6-band parametric EQ, a limiter and delay, plus high-pass and low-pass filters adjustable from 20 Hz to 20 kHz with polarity control. Delay runs from 0 to 74 milliseconds and total latency from analogue input to speaker is 1.5 milliseconds.
Factory presets are loaded for Yamaha's passive speakers, so a CBR, Club or VXS/VXC box gets the right crossover, EQ and limiting without you measuring anything. There are eight user preset slots on top of that for your own rigs. The over-voltage limiter can be configured by wattage or by speaker preset, which keeps a cheaper cabinet safe when it is hanging off an amp this size.
Outputs are two Neutrik speakON NL4 sockets, two pairs of binding posts and two quarter-inch TS jacks, so it wires into anything from a touring loom to a bar install. Input impedance is 20 kilohms balanced or 10 kilohms unbalanced, maximum input is +24 dBu, and gain can be set to 32 dB, 26 dB, +4 dBu or +14 dBu sensitivity to match whatever mixer or DSP is feeding it.
Thermal, over-voltage and over-current faults shut the power supply down, while a DC fault holds it off until you intervene, so a failed driver does not take the amp with it. Two 16-step variable-speed fans push air front to rear and stay quiet at low load. Front-panel LEDs show power, alert, USB, protect, clip/limit and signal per channel, with an auto LED-off feature for dark stages. Power draw is 55 watts idling and 230 watts at one-eighth power, and a 2-metre AC cable and USB cover come in the box.
| Brand | Yamaha |
|---|---|
| Model | PX5 |
| Included | USB cover, Owner's Manual, Specification sheet, AC cable (2.0m) x 1 |
| Strings | Operating Temperature: 0°C to +40°C, Storage temperature: -20°C to +60°C |
| 100V models | 1000W x 2 |
| 2Ω | 500W x 2 |
| 8Ω/Power Boost Mode | 800W x 1 |
| 4Ω/Power Boost Mode | 1400W x 1 |
| 120V models | 1000W x 2 |
| 220V-240V models | 1000W x 2 |
| Total harmonic distortion | 0.1% (1kHz, 10W), 0.3% (1kHz, Half power) |
| Frequency response | ±1.0dB (1W, 8Ω, 20Hz to 20kHz) |
| S/N ratio | 100dB (A-weighted, 8Ω, Gain setting = +14dBu) |
| Crosstalk | Less than -60dB (Half Power, 8Ω, 1kHz, Vol max input 150Ω shunt) |
| Voltage Gain/Sensitivity | 32.0dB/+8.3dBu (Gain setting: 32dB), 26.0dB/+14.3dBu (Gain setting: 26dB), 36.3dB/+4dBu (Gain setting: +4dBu), 26.3dB/+14dBu (Gain setting: +14dBu) |
| Maximum input voltage | +24dBu |
| Input impedance | 20kΩ (Balance), 10kΩ (Unbalance) |
| I/O Connectors | Neutrik speakON NL4 x2, Binding post x2 pairs, 1/4" PHONE(TS) x2 |
| Indicators | POWER x1 (Green), ALERT x1 (Red), USB x1 (Green), PROTECT x2 (Red), CLIP/LIMIT x2 (Red), SIGNAL x2 (Green); Auto LED off feature |
| Latency | 1.5 msec (Analog Input to Speakers) |
| Presets | 8 user amplifier presets (Factory preset: Speaker presets for Yamaha passive speakers) |
| Power supply protection | Thermal: Output limiter (Restored automatically) → Power supply shutdown; Over voltage: Power supply shutdown; Over current: Power supply shutdown |
| Amplifier class | Class D, Balanced output circuit (BTL) |
| Cooling | 16 step variable speed fan x 2, front to rear airflow |
| Power requirements | Depending on area of purchase; 100V 50Hz/60Hz, 120V 60Hz, 220V-240V 50Hz/60Hz *Verified as operating at rated power voltage +/- 10% voltage. |
| Power consumption | 230W (1/8 MAX power, 4Ω, Pink noise at all channels), 55W (4Ω, Idling) |
| Dimensions | 480mm (18-7/8") |
| Net weight | 6.9 kg (15.21 lbs) |
| Colour | Power Amplifier |
