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Designed for professional monitoring at the highest resolution possible, the Monotor from Little Labs provides long fatigue-free analytical listening on par with most mastering facilities. The analytic functions include stereo reverse, regular stereo, mono left-plus-right, mono left (left in both ears), mono right (right in both ears), and left-minus-right for hearing what is out of phase (between what is feeding the left and right in) and also useful for compressed digital audio file artifact analysis.
The Monotor offers two separate headphone amplifiers controlled by a single level knob and each amplifier powers both a 1/4" and 1/8" output for a total of four connected headphones. However, it is recommended that only a single headphone should be connected per amplifier to maintain the best possible sound. Additionally, an 1/8" mini jack input is included to provide a phone or portable audio device to be connected post mono and post volume control. A pair of TRS parallel inputs (which also work as pass-thru outputs) are also provided to further expand the connectivity and allow for daisy-chaining multiple units.
The Monotor utilizes a "Zen" circuit topology, where only a single state-of-the-art active stage is used in the circuit path of each headphone ear. All other circuit paths are straight wire passive, including all the mono functions. All passive components in the audio path were selected for sonic neutrality, this includes dale/vishay resistors, nichicon muse series caps and specialized polystyrene film decoupling caps. The Monotor uses a full voltage super low noise internal linear regulation system (4 uVrms) with massive capacitance for power on demand on each rail, which allows for a noticeably improved dynamic range over other headphone amps. The unit is able to drive the highest impedance headphones without any strain and no detectable hiss even at the highest volumes. The Monotor ships with a power supply.
Dual 1/4” and 3.5mm separately amplified headphone jacks, for no, “where’s that adapter” hook up and partner monitoring
Extensive mono monitoring capability: left plus right, left, right, and even left minus right, for phase check and digital compressed audio file artifact analysis
Internal state of the art super low noise linear voltage regulation, providing audiophile full current/voltage (unlike USB wimp powered headphone amps)
Easy input interface for balanced or unbalanced gear
Minimal audiophile (almost completely passive) zen circuit path using a single, truly state of the art active stage per headphone output (0.5 ohms independently verified output impedance, beware of false .04 ohm output impedance claims)
XLR/TRS combo jack inputs in parallel with TRS jacks for easy in-line monitoring hook up
Stereo mini aux input for talkback communication or easy portable player hookup
Quality stepped volume attenuator with internal bypass for remote volume control capability
Rack-mountable: Up to 4 Little Labs devices fit in a 1u space
In the Box
LITTLE LABS Monotor Audiophile Headphone Amplifier w/ Mono Analysis
Limited 3-Year Warranty
Table of Contents
2x XLR-1/4" / 6.35 mm combo jacks
1x 1/8" / 3.5 mm stereo mini jack
2x Parallel TRS input/output jacks (can be used for pass-thru or daisy-chaining)
2x 1/4" / 6.35 mm TRS phone jacks
2x 1/8" / 3.5 mm TRS phone jacks
Measured in stereo mode with TOA ZM-104 impedance meter
Balanced signal measured between pin 2-3 XLR or Tip-Ring (TRS)
Balanced Input Impedance with Level Control In: 5 to 11 kOhms*
Balanced Input Impedance with Level Control Out: 8 kOhms
Unbalanced Input Impedance with Level Control In: 4 to 5 kOhms*
Unbalanced Input Impedance with Level Control Out: 20 kOhms
*Front end passive level attenuator varies input impedance depending
Headphone Output Impedance
Power in Bipolar: 16.5 VDC
Dimensions (L x W x D)
Monotor: 6.5 x 4.0 x 1.5" / 165.1 x 101.6 x 38.1 mm
Power Supply: 3.0 x 5.0 x 2.3" / 76.2 x 127.0 x 57.2 mm
Monitor: 3.0 lb / 1.4 kg
Power Supply: 2.0 lb / 0.9 kg
LITTLE LABS Monotor Audiophile Headphone Amplifier w/ Mono Analysis Review