8-Channel Rackmount Headphone Amplifier The Mackie HM-800 is a rack-mountable, 8-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 two stereo main outputs via four 1/4" jacks and sixteen 1/4" TRS stereo headphone outputs-two per channel-fed by a customizable blend of inputs. Two stereo main inputs via four 1/4" jacks can be combined with a per-channel 1/4" stereo aux input. Each channel offers stereo/mono mode switching, input selection, and output level adjustments. 7-segment LED meters display main input and per-channel output levels. The HM-800 ships with an IEC power cable and occupies 1 RU in a standard 19" rack.Features: Distribute signal to up to sixteen pairs of headphones Occupies 1 RU Two stereo main inputs via four 1/4" jacks One 1/4" stereo aux input per channel Two stereo main outputs via four 1/4" jacks Two 1/4" stereo headphone outputs—one on the front panel and one on the rear—per channel fed by an output level control Switches on each channel for stereo/mono operation input selection 7-segment LED metering for main input and each output channel Heavy-gauge steel chassis for rugged durability Specifications: Number of Channels: 8 Input Connections: 4 x 1/4" TRS balanced (two stereo pairs, also accepts 1/4" TS unbalanced) 8 x 1/4" TRS stereo unbalanced for aux inputs Output Connectors: 4 x 1/4" TRS balanced (two stereo pairs, also accepts 1/4" TS unbalanced) 16 x 1/4" TRS stereo unbalanced headphone outputs Maximum Input Level: Main Input: +19 dBu Aux Input: +20 dBu Maximum Output Level: Headphone Outputs: 550 mW per channel at 47 Ohms (+21 dBu) Input Impedance: Main Input: 40 kOhms balanced, 20 kOhms unbalanced Aux Input: 13 kOhms unbalanced Output Impedance: Headphone Outputs: 3 Ohms unbalanced Gain Range: Main Input: -67 to +19 dBu Function Controls: Power on/off Main level knobs In 1/2 switches per channel Stereo/Mono switches per channel Output knob per channel Frequency Response: 20 Hz to 20 kHz (±1 dB) THD: 52 dB at 1 kHz Display: 1 x input level meter 8 x 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: 1 x 3-pin IEC male, 250 VAC, 10 A Construction Material: Heavy-gauge steel chassis Dimensions (H x W x D): 1.8 x 19.0 x 8.8" / 46 x 483 x 224 mm Weight: 8 lb / 3.6 kg
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