A-9120DHM2 - Mixer TOA - Free user manual and instructions
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| Product Type | Digital Mixing Console |
| Number of Channels | 12 input channels (8 mono + 4 stereo) |
| Frequency Response | 20 Hz - 20 kHz ±1 dB |
| Total Harmonic Distortion | Less than 0.005% @ 1 kHz |
| Dimensions (W x H x D) | 482 x 132 x 350 mm (19" rack mountable) |
| Weight | 12 kg |
| Power Supply | AC 100-240 V, 50/60 Hz, 120 W |
| Phantom Power | +48 V DC, switchable per channel |
| Equalization | 3-band EQ with sweepable mid on mono channels |
| Built-in Effects | 24-bit DSP with 16 presets (reverb, delay, chorus) |
| Outputs | Main L/R, 4 aux sends, 2 group outputs, digital USB out |
| Inputs | 8 XLR/TRS combo jacks, 4 stereo RCA/TRS pairs |
| USB Interface | 2-in/2-out USB audio recording |
| Cooling | Fanless, convection cooled |
| Maintenance | Clean with dry cloth; keep ventilation slots free of dust |
| Safety | Overcurrent protection; Class 1 equipment with ground |
| Spare Parts & Repairability | Authorized service centers; parts available for 10 years |
| Warranty | 3 years limited warranty |
| General Information | Suitable for live sound, installation, and recording |
Frequently Asked Questions - A-9120DHM2 TOA
How do I connect the mixer to a computer for recording?
Connect via the USB port on the rear panel. The mixer appears as a 2-in/2-out audio interface. Use a standard USB 2.0 cable. Install drivers if prompted, or use class-compliant mode.
How do I enable phantom power?
Press the +48V button on the channel strip for the desired input. Ensure the channel gain is turned down before engaging phantom power to avoid loud pops.
What should I do if there is no sound from the main output?
Check that the main mix fader is up, the channel faders are at unity, and the mute buttons are not engaged. Verify that the master output is routed to the main L/R and that the speakers or amplifier are powered on.
Can I use this mixer with stage monitors?
Yes, use the aux send outputs to connect to monitor speakers. Each aux can be configured pre- or post-fader via the PRE/POST switch on each channel. Adjust aux levels using the aux send knobs.
How do I reset the built-in effects?
Press the FX RESET button on the effects section to return to the default preset. To restore factory settings, power off the mixer, then hold the FX RESET button while powering on.
What type of cables should I use for connecting microphones?
Use balanced XLR cables for microphones to minimize noise. For line-level sources, balanced TRS 1/4-inch cables are recommended. Unbalanced cables may be used but can introduce hum over long distances.
How often should I clean the mixer?
Clean the surface with a soft, dry cloth weekly. For stubborn dirt, slightly dampen the cloth with water. Do not use solvents or abrasive cleaners. Ensure ventilation slots are free of dust every month.
Can I connect a guitar directly to the mixer?
Yes, use a DI box (direct injection) to convert the unbalanced high-impedance signal to balanced low-impedance. Alternatively, connect to a line input if the guitar has active pickups, but a DI box is preferred for best sound quality.
What is the maximum number of microphones I can use at once?
You can use up to 8 microphones simultaneously with the mono XLR inputs. Each of the 8 combo jacks supports phantom power and low-cut filters. The stereo channels are designed for line-level sources.
How do I update the firmware?
Firmware updates are available on the TOA website. Download the update file to a USB flash drive, insert it into the USB port, and follow the on-screen prompts on the mixer's display. Do not power off during update.
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USER MANUAL A-9120DHM2 TOA
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Product information
Brand : TOA
Model : A-9120DHM2
Category : Mixer