The Hafler HA75 is a 'vintage motivated' headphone amplifier that has actually been carefully designed to produce Hafler's famous sound quality while adding enjoyment and character of a real tube circuit to optimize the listening experience. The design begins with a 14 gauge steel casing to protect the internal workings from external magnetic fields and RF contamination. This is complimented with a black anodized aluminum front panel for clean, esthetic appeal. An option of either out of balance RCA or well balanced XLR inputs are readily available. These are gold-plated to remove tarnishing over time while optimizing signal flow. Inside, a 100% discrete class-A head-amp combines with a 12AX7 tube drive to power the earphones. This utilizes an unique non-radiating charge pump that applies 140 volts to television to maximize headroom as it delivers the character and warmth that a lot of listeners choose over strong state equivalents. Unique to the HA75 is an unfavorable feedback control. This allows the user to increase or reduce the negative feedback to produce either a more 'scientific' (strong state) or a 'warmer' (tube) response, additional boosting the signal course for the type of program material that is at play. To mimic the response of listening to speakers in an acoustic space, a Focus control may be engaged that brings the stereo image to the center by means of a totally variable potentiometer. This active control activates a matrix that delivers interesting results without collapsing the stereo image. A Vox function warms the tone akin to an old-school loudness control, dealing with the Fletcher-Munson curves to deliver equal loudness when listening at low levels. The HA75's strong amplifier phase has the ability to handle all kinds of earphone impedances from 8 Ohms to 400 Ohms without choking as it quietly delivers a lot of warmth and character to genuinely improve the listening experience.
100% discrete class-A circuit with 12AX7 tube drive
Variable FocusTM control to simulate listening in a room
Adjustable negative feedback to tailor signal path
Choice of unbalanced RCA or balanced XLR inputs