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Explains power button functions, LED indicators, crossfeed controls, and volume adjustment.
Details input/output jacks, power connector specifications, and battery charger jumper.
Covers gain boost jumpers and the amp chip socket for customization.
Instructions for connecting audio sources to the input and headphones to the output.
Specifies that headphones can have an impedance of 24 to 600 ohms.
Details how to turn the unit on for specific durations or indefinitely.
Explains toggling flashlight mode and LED dimming via button presses.
Instructions on how to enable or disable the crossfeed circuit using the switch.
Guidance on using the potentiometer to set crossfeed from mono to near-stereo.
Explains the benefits of crossfeed for simulating loudspeaker soundstage with headphones.
Provides numbered steps for opening the unit, removing the panel and bezel.
Guides on how to correctly reassemble the unit after internal access.
Offers a solution for stripped screw receptacles using pliers.
Step-by-step guide to disconnect, remove, and connect a new battery.
Emphasizes holding the power button for 10 seconds to discharge the circuit.
Advises disassembling the unit if the battery cable becomes entangled.
Explains how installing jumpers provides an extra +10dB of gain, for a total of +23.1dB.
Recommends using gain boost for headphones with higher impedance or low volume.
Provides instructions on disassembling the unit and placing jumpers on riser pins.
Details acceptable voltage/AC RMS ranges and warns against exceeding them.
Discusses using external adapters with alkaline batteries and milliamp ratings.
Recommends a specific 12VDC adapter and connector for compatibility.
Explains how the amber LED flashes to indicate battery voltage when the unit is turned on.
Describes the amber LED warnings for low (6.5V) and very low (5.2V) battery levels.
Lists compatible rechargeable battery types and discusses 7.2V battery caution.
Details voltage requirements for external power adapters when using the built-in charger.
Explains when to install or remove the jumper for charging functionality.
Confirms the XM3 accepts line-level inputs from sources like CD players.
Clarifies the XM3 is a headphone amp and not suitable for driving speakers.
Directs users to the company website for more frequently asked questions.
Provides a solution involving battery disconnection and power button hold.
Suggests increasing source volume or installing gain boost jumpers.
Recommends checking cable connections and ensuring a stereo cable is used.
Outlines the terms and conditions for returning the product for a refund.
Details the warranty covering defects in workmanship and exclusions.
Provides email contact for service inquiries and reports.
Covers description, weight, power sources, and external power adapter details.
Includes battery life, gain, frequency response, distortion, and signal-to-noise ratio.
Details dynamic range, crossfeed, power management, mechanics, and other features.
General| Brand | Practical Devices |
|---|---|
| Model | XM3 |
| Category | Amplifier |
| Language | English |
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