Mini 2-Input Class D Audio Amplifier with Mic Mixer
KanexPro AP2DBL — quarter-rack Class D amplifier with mic mixer, 48V phantom power, ducking, 3-band EQ, and RS232 for integrator-controlled rooms and…
The KanexPro AP2DBL eliminates the need for a separate mic preamp and mixer in space-constrained AV installations. This quarter-rack-width Class D amplifier delivers 2×20W at 4Ω with a built-in microphone mixer featuring 48V phantom power, automatic ducking, and independent volume control — combining amplification, mixing, and EQ in a single compact chassis. Two switchable stereo inputs (RCA and 3.5mm) accommodate media players, laptops, and wireless mic receivers, while the balanced MIC input supports condenser, dynamic, and line-level sources. RS232 control with a documented command set enables integration with Crestron, Extron, and other room controllers. Bridge mode doubles output to 1×40W at 8Ω for single-speaker installations, and a stereo loop output enables multi-zone daisy-chaining.
- Fast switching audio amplifier
- 2×20 Watt@4Ω as the default amplifier output
- Bridge connection supported by switching the amplifier to be 1×40Watt@8Ω
- Supports Dual-mono output
- Built-in Microphone mixer (separately controllable)
- Line audio output, with volume controllable
- MIC input supports 48V phantom power
- MIC port with balanced switching suppress
- Supports balanced/unbalanced signals
- Supports Ducking power technology
Specifications| Stereo Audio Inputs | 2x stereo (RCA + 3.5mm jack) |
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| Microphone Input | 1x MIC (captive screw connector, balanced) |
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| Amplifier Output | 1x captive screw connector |
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| Stereo Audio Loop | 1x 3.5mm jack |
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| Input Impedance | >10 kohm |
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| Output Impedance | 50 ohm (stereo), 4-8 ohm (amplifier) |
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| Frequency Response | 20 Hz - 20 kHz |
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| CMRR | >70 dB @ 20 Hz - 20 kHz |
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| Signal-to-Noise Ratio | 80 dB at maximum output |
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| Bandwidth | 20 Hz - 25 kHz |
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| Stereo Channel Separation | >75 dB @ 20 Hz - 20 kHz |
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| THD + Noise | 1% @ 1 kHz, 0.3% @ 20 kHz at nominal level |
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| Voltage Gain | 32 dB |
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| Power Output | 2x20W at 4 ohm (bridgeable to 1x40W at 8 ohm) |
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| MIC Input Impedance (48V) | 35 kohm |
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| MIC Input Impedance (MIC) | 10 kohm |
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| MIC Input Impedance (LINE) | 75 kohm |
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| MIC Audio Detection Delay | <1 ms |
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| RS232 | 9-pin female D connector (2=TX, 3=RX, 5=GND) |
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| Baud Rate | 9600, 8 data, 1 stop, no parity |
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| IR Remote | Optional (not included) |
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| TCP/IP | Optional via TCPRS2 adapter |
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| Dimensions (HxWxD) | 1.5″ x 3.78″ x 3.45″ |
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| Weight | 0.67 lbs (0.3 kg) |
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| Power Supply | Internal universal 100-240V AC, 50/60 Hz |
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| Power Consumption | 3.6W |
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| 1x | AP2DBL Audio Amplifier |
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| 1x | Power Cable |
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| 1x | User Manual |
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Questions
- Does it support condenser microphones?
- Yes. The MIC input provides switchable 48V phantom power for condenser mics, plus MIC and LINE modes for dynamic mics and wireless receivers.
- What RS232 settings are required?
- 9600 baud, 8 data bits, 1 stop bit, no parity. 9-pin female D connector with pin 2=TX, 3=RX, 5=GND.
- What microphone connection modes are available?
- Three modes: 48V phantom power for condenser mics, MIC mode for dynamic mics (balanced or unbalanced), and LINE mode for wireless mic receivers or line-level sources.
- Can I daisy-chain multiple AP2DBL units?
- Yes. The stereo loop output (3.5mm) feeds a line-level signal to a second AP2DBL or external amplifier for multi-zone coverage.
- How do I mount AP2DBL?
- Quarter-rack width (3.78 inches wide, 1.5 inches tall). Can be placed on a shelf, mounted under a table, or installed in a rack with a third-party quarter-rack shelf.
- What power supply does it use?
- Internal universal power supply accepting 100-240V AC, 50/60Hz. No external power adapter required. Power consumption is 3.6W.
- Audio is distorted at high volume
- Check speaker impedance (must be 4 ohm minimum in stereo mode, 8 ohm in bridge mode). Reduce volume via RS232 preset command or front-panel controls. Verify input signal level is within spec.
- RS232 commands not responding
- Confirm baud rate 9600, 8N1. Verify pin assignment: 2=TX, 3=RX, 5=GND on the 9-pin female D connector. Ensure command strings include the trailing period or percent sign.
- Can it drive 70V/100V distributed speakers?
- No. AP2DBL outputs 2x20W at 4 ohm low-impedance only. For 70V/100V, specify the AP3DBL (40W, 70V/100V).
- How do I get more power from AP2DBL?
- Switch to Bridge mode for 1x40W at 8 ohm mono output, or cascade via the Loop output to a second amplifier.