4-Channel Rackmount Headphone Amplifier The Mackie HM-400 is a rack-mountable, 4-channel headphone amplifier designed to provide versatile headphone amplification for artists, musicians, and engineers monitoring through headphones in live stage applications and home, project, commercial, and mobile-recording studios. It features a stereo main output via XLR and 1/4" jacks and twelve 1/4" TRS stereo headphone outputs-three per channel-fed by a customizable blend of inputs. One stereo main input via XLR and 1/4" jacks can be mixed with a per-channel 1/4" stereo aux input. Each channel offers 2-band EQ for quick tone shaping, stereo balance or main/aux input mix control, and output level adjustments. Also on each channel are switches for muting left and/or right signals and operating in stereo or mono. 7-segment LED meters display main input and per-channel output levels. The HM-400 ships with an IEC power cable and occupies 1 RU in a standard 19" rack.Features: Distribute signal to up to twelve pairs of headphones Occupies 1 RU One stereo main input via XLR or 1/4" jacks One 1/4" stereo aux input per channel One stereo main output via XLR or 1/4" jacks Three 1/4" headphone outputs—one on the front panel and two on the rear—per channel fed by an output level control 2-band EQ per channel for quick treble and bass adjustments Per-channel Balance knob allows control of left/right level balance or aux/main input mix Switches on each channel for L/R mute and St/2-Ch (stereo/mono) mode 7-segment LED metering for input and each output channel Heavy-gauge steel chassis for rugged durability Specifications: Number of Channels: 4 Input Connections: 2x XLR 3-pin balanced (one stereo pair) 2x 1/4" TRS balanced (one stereo pair, also accepts 1/4" TS unbalanced) 1x 1/4" TRS stereo unbalanced for main input 4x 1/4" TRS stereo unbalanced for aux inputs Output Connectors: 2x XLR 3-pin balanced (one stereo pair) 2x 1/4" TRS balanced (one stereo pair, also accepts 1/4" TS unbalanced) 12x 1/4" TRS stereo unbalanced headphone outputs Maximum Input Level: Main Input: +15 dBu Aux Input: +20 dBu Maximum Output Level: Headphone Outputs: 550 mW per channel at 47 Ohms (+21 dBu) Input Impedance: Main Input: 20 kOhms balanced, 10 kOhms unbalanced Aux Input: 10 kOhms unbalanced Output Impedance: Headphone Outputs: 3 Ohms unbalanced Gain Range: Main Input: -66 to +18 dBu Function Controls: Power on/off Main level knob L/R mute switches per channel Stereo/2-Ch switches per channel 2-band EQ per channel Balance knob per channel Output knob per channel Frequency Response: 20 Hz to 20 kHz (±1 dB) THD: 42 dB at 1 kHz Display: 1x input level meter 4x output level meters Power Requirement: 100 to 120 VAC, 50/60 Hz, 24 W 220 to 240 VAC, 50/60 Hz, 24 W Power Connector: 1x 3-pin IEC male, 250 VAC, 10 A Construction Material: Heavy-gauge steel chassis Dimensions (Hx Wx D): 1.8x 19.0x 8.8" / 46x 483x 224 mm Weight: 8 lb / 3.6 kg
Related
Related
Related
Related