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The Hafler HA75 is a "vintage inspired’" headphone amplifier that has been meticulously designed to produce Hafler’s legendary sound quality while adding excitement and character of a real tube circuit to optimize the listening experience.

The design begins with a 14 gauge steel casing to shield the internal workings from external
magnetic fields and RF contamination. This is complimented with a black anodized aluminum front
panel for clean, esthetic appeal. A choice of either unbalanced RCA or balanced XLR inputs are
available. These are gold-plated to eliminate tarnishing over time while optimizing signal flow.

Inside, a 100% discrete class-A head-amp combines with a 12AX7 tube drive to power the headphones.
This employs a unique non-radiating charge pump that applies 140 volts to the tube to maximize
headroom as it delivers the character and warmth that so many listeners prefer over solid state
counterparts. Unique to the HA75 is a negative feedback control. This enables the user to increase
or decrease the negative feedback to produce either a more ‘clinical’ (solid state) or a ‘warmer’
(tube) response, further enhancing the signal path for the type of program material that is at
play. To simulate the response of listening to loudspeakers in an acoustic space, a Focus control
may be engaged that brings the stereo image to the center via a fully variable potentiometer. This
active control activates a matrix that delivers exciting results without collaps- ing the stereo
image. A Vox function warms the tone akin to an old-school loudness control, addressing the
Fletcher-Munson curves to deliver equal loudness when listening at low levels. The Vox control can
also can be used and create a ‘boom-box’ effect for those that enjoy a more exaggerated response.

The HA75’s heavy duty amplifier stage is able to handle all types of headphone impedances from 8
Ohms to 400 Ohms without choking as it quietly delivers plenty of warmth and character to truly
enhance the listening experience.

• 100% discrete class-A circuit with 12AX7 tube drive
• Variable Focus control to simulate listening in a room
• Adjustable negative feedback to tailor signal path to taste
• Choice of unbalanced RCA or balanced XLR inputs


Circuit: Discrete class-A with 12AX7
Inputs: Switchable RCA or XLR
Thru-puts: RCA (left/right)
Output: 1/4" TRS Headphone
Impedance: 8 Ohm ~ 400 Ohm
Gain: 30 dB
Max Output: 5 V RMS

Hafler products are proudly designed and
manufactured in North America.


Can the HA75 damage my hearing?

Yes. Any time you are subjected to long periods of high sound pressure levels, you can damage your hearing. Always monitor your kids listening levels and consult local health and government safety regulations to ensure you stay within safe margins.

What is the benefit of tubes?

Tubes introduce warm-sounding even order harmonic distortion that is pleasing to the ears. This is why most audiophiles prefer the sound of tubes over solid state counterparts. The other benefit is the distortion acts like a natural limiter. This tends to reduce ear fatigue.

Do I need to warm the HA75 up before using it?

Yes. It takes about 15 minutes to achieve thermal stability. This of course produces a better sound as all of the components reach their optimum temperature.

Why is there no digital input on the HA75?

Today, there are many choices when it comes to DACs (digital to analog converters) and since most audiophiles have a preference, we felt that they would likely already have one that they like. The other issue is constantly changing standards. A good headphone amp with traditional analog inputs will never go out of style.

Can you explain negative feedback?

Negative feedback is used to control the amplifier from thermal runaway. This also results in less noise. However, may purists prefer to have as little negative feedback as possible in the signal chain to reduce phase cancellation. With the HA75, you can adjust to suit your personal taste.

Why did you incorporate a bass loudness switch?

Some will argue that true audiophiles may never use this function. However, when listening to music at low levels, bass energy can become too low. The loudness switch allows the user to add more bass to suit. This also allows users that enjoy listening to accentuated bass to share in the fun.

Why an external power supply?

External power supplies enable manufacturers to ship the same product around the globe without having to pay costly safety certificates. This makes the product more affordable for the end user. Further, power supplies tend to be the part of the circuit that is most subject to fail. This makes servicing easy. Finally, power supplies generate a ton of noise. This is particularly troublesome in small boxes. So removing the power supply lowers the noise floor.

List Price: $1200.00
Price: $999.99

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