Compact 40W 70V/100V Audio Amplifier with Mic Mixer
Discontinued
KanexPro no longer makes the AP3DBL. The support information below still applies to units in service.
KanexPro AP3DBL is a 40W 70V/100V mixer amplifier with RCA, 3.5mm, and TOSLINK inputs. MIC mixing, ducking, RS232 ID loop, 48V phantom power. CE/FCC/UL.
Routes audio from any combination of analog or digital sources through a single 40-watt amplifier output switchable between 70V and 100V distributed speaker systems — with built-in MIC mixing, ducking, Bass/Treble EQ, and 48V phantom power in a compact desktop chassis. Three switchable inputs (dual-mono RCA, 3.5mm stereo, and TOSLINK optical) handle the full range of source types found in installed AV environments. Designed for classrooms, conference rooms, lecture halls, restaurants, and hospitality spaces, the AP3DBL supports RS232 serial control with 16 addressable ID codes for multi-unit installations, IR remote control, and front panel operation. MIC input accepts condenser, dynamic, and wireless microphone types with balanced/unbalanced signal support and automatically ducks line audio when MIC signal is detected.
Questions
- What output power does the AP3DBL deliver and what speaker systems does it drive?
- 40W rated mono output, switchable between 70V and 100V constant-voltage distributed speaker taps. Total connected speaker load must not exceed 40W.
- What audio inputs are available on the AP3DBL?
- Three switchable program inputs plus a dedicated MIC input. Input 1 is dual-mono RCA (L/R), Input 2 is 3.5mm stereo, Input 3 is TOSLINK digital optical. The MIC input uses a 3-pole captive screw connector and is always active, mixed into the output at its own level.
- How do I control the AP3DBL from a third-party control system?
- Use the RS232 port (3-pole captive screw, TX=2, RX=3, GND=5) at 9600 baud, 8N1. Core commands include 1A1. / 2A1. / 3A1. to select Input 1, 2 or 3, 5[xx]% to set MIC volume (00-60), 7[xx]% to set line volume (00-60), 8[xx]% for bass (00-08), 9[xx]% for treble (00-08), and 600% to query current statu
- Can I control multiple AP3DBL units over a single RS232 connection?
- Yes. Each unit has a rotary ID selector (0-F hex). Set a unique ID of 1 through F on each unit and chain the RS232 connections as an ID loop, then address each unit by prefixing commands with its ID. A unit set to ID 0 responds to all commands regardless of prefix.
- How do I wire the amplifier output to a 70V or 100V speaker line?
- Use the 3-pole captive screw AUDIO OUT connector: COM is ground, and the 70V and 100V terminals are the constant-voltage taps. Connect COM plus the single tap matching your speaker system. Do not connect both taps simultaneously, and keep total speaker load at or under 40W.
- How is the AP3DBL powered and how much does it draw?
- A DC 24V barrel-connector power adapter is included. Power consumption is 5W. The red POWER LED on the rear panel illuminates when the unit is powered.
- There is no audio at the speakers. What should I check?
- Confirm the correct input is selected and the source is connected and playing. Verify the output tap in use (70V or 100V) matches the speaker system. Confirm total speaker load does not exceed 40W. Check that the unit is not muted at the front panel or via RS232.
- RS232 commands are not being accepted. What is wrong?
- Verify serial settings are 9600 baud, 8N1, and that wiring is TX=2, RX=3, GND=5. Check the rotary ID code: if it is set to 1 through F, every command must carry the matching ID prefix. Set the ID to 0 to accept commands without a prefix.
- How does the AP3DBL differ from the AP2DBL?
- The AP3DBL drives 70V/100V constant-voltage distributed speaker systems with a 40W mono output and adds a TOSLINK digital optical input. The AP2DBL is a low-impedance stereo Class D amplifier rated 2x25W into 4 Ohms. Choose the AP3DBL for ceiling or pendant speaker lines on a voltage tap, and the AP
- Why choose the AP3DBL over a generic mixer amplifier?
- It combines three switchable inputs including digital optical, 48V phantom power for condenser microphones, automatic ducking for paging over music, independent Bass and Treble control, and full RS232 control with 16 addressable IDs for multi-unit installations, in a 1.5 inch high convection-cooled