KMA Machines Stereo Headphone Amp Effects Pedal - KMA-STHEAMP
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Product Information
Full details
The KMA Machines Stereo Headphone Amp is designed for musicians seeking a high-quality, compact headphone amplifier for the end of their pedalboard, integration with amp simulators, or standalone practice. Its key benefit is delivering premium analog sound with ample headroom, ensuring your audio remains tight and open even when using headphones. A potential caveat is its focus on core headphone amplification, meaning it lacks advanced EQ or tone shaping features.
All features
| Model Part Number | KMA-STHEAMP |
|---|---|
| Brand | KMA Machines |
Extended Product Information
FAQs
Can I plug my guitar directly into the KMA Stereo Headphone Amp?
While the unit accepts instrument-level signals, it is optimized for line-level sources. For best results, use it after a preamp, amp simulator, or audio interface.
Does it require phantom power?
No, the KMA Stereo Headphone Amp does not use or provide phantom power. It requires a standard 9-18V DC center-negative power supply.
Can I use two different types of headphones?
Yes, you can use two different pairs of headphones, but they will share the same volume controlled by the single Phones knob.
What is the difference between Full and Thru output modes?
In Full mode, the AUX input signal is mixed with your main input signal and sent to the main output jacks. In Thru mode, the AUX input is only sent to the headphone outputs and is not passed through to the main output jacks.
What type of power supply do I need?
You need a 9-18V DC power supply with a center-negativepolarity. The current draw is approximately 100mA. A standard 9V pedal power supply is common.
Can I connect a stereo source using two separate TS cables?
Yes, the 6.35 mm I/O automatically recognizes TS for mono and TRS for stereo. If your source is stereo, using two TS cables will be detected as a stereo input.
Troubleshooting
No sound through headphones
Check that the power supply is connected and the unit is switched on. Ensure headphones are securely plugged into the Phones output. Verify that the input source is active and sending a signal. Confirm the Phones volume knob is turned up.
Distorted or clipping sound
Reduce the level of the input signal using the Input Level knob. Check the Clip LED; if it's constantly lit, the input signal is too hot. Lower the volume of the backing track if using the AUX input.
Bluetooth AUX input not connecting
Ensure the KMA amp is in Bluetooth pairing mode (refer to device manual for specific pairing procedures). Make sure your phone or audio device's Bluetooth is enabled and within range. Try restarting both the KMA amp and your audio device.
Only hearing one channel (stereo issue)
Confirm that the input source is sending a stereo signal and that both input jacks are correctly connected with a TRS cable if applicable. Ensure your headphones are stereo headphones.
Pros and Cons
Pros
- Provides clear, high-fidelity headphone monitoring.
- Compact size ideal for pedalboards or travel.
- Dual headphone outputs are convenient for practice or collaboration.
- Versatile AUX input for jamming with tracks.
- Robust build quality typical of KMA Machines products.
Cons
- Lacks built-in tone shaping or EQ.
- Relies on external power (not included).
- Primarily designed for line-level sources, not instrument level directly.
- Two headphone outputs share a single volume control.
Setup, Compatibility & Care
Setup:
- Connect your audio source (e.g., amp sim output, audio interface) to the 6.35 mm Input jacks. The unit automatically detects TS (mono) or TRS (stereo) connections.
- Connect your headphones to one of the two Phones outputs using a 6.35 mm jack.
- Connect an optional backing track source to the AUX In via Bluetooth or a 3.5 mm stereo cable.
- Connect a compatible power supply (not included) to the power input.
- Adjust the Input Level to achieve a suitable signal strength without excessive clipping (monitor the Clip LED).
- Use the Phones knob to set your desired listening volume.
- Use the Mix knob to balance your main audio signal with the AUX input.
- Select Output Mode (Full or Thru) as needed.
Compatibility:
- Compatible with line-level stereo or mono outputs from audio interfaces, preamps, amp modelers, and other effect pedals.
- Accepts standard 6.35 mm (1/4 inch) TS and TRS plugs for input and headphones.
- Supports Bluetooth audio streaming for the AUX input.
- Requires a 9-18V DC center-negative power supply (not included), with a current draw of approximately 100mA.
Care:
- Keep the unit dry and away from moisture.
- Avoid exposing the unit to extreme temperatures.
- Clean the exterior with a dry, soft cloth. Do not use solvents or abrasive cleaners.
- Ensure all cables are securely connected but do not pull forcefully on them.