- A Class A amplifier conducts signal over the entire range of the
input signal cycle. The output transistors are biased to operate in
their most linear range, and there is no crossover distortion caused
by switching the signal between two push-pull devices. The HA-1's
power amplification circuit for the headphones is Class A built with
discrete transistors. The discrete design allows us to hand-pick and
match the best parts to build the HA-1.
Fully Balanced Design
- The internal analog audio signal path of the HA-1 is fully balanced.
For digital audio, the signal runs in balanced mode all the way from
the DAC to the output jacks. Balanced analog input is kept intact,
and single-ended input is converted to balanced at the input buffer.
All single-ended outputs are derived from the balanced signal as
well. The balanced design provides better common-mode noise
rejection and improves signal quality. The balanced headphone output
provides twice the voltage and four times the power of the
single-ended output, enabling the HA-1 to drive the most power
hungry headphones. It also provides better channel seperation by
eliminating the common ground return path.
Clean Signal Path
– The HA-1 uses an analog potentiometer (the familar volume knob) to
control the volume. By avoiding re-digitizing the audio signal for
volume adjustment, the HA-1 provides a clean signal path for the
audio. At the same time, the convenience of modern digital volume
control is not lost - a remote-controlled motor turns the volume
knob and a 10-bit analog-to-digital converter samples the signal to
display a numeric dB level.
Toroidal Power Supply
toroidal power transformer offers superior power efficiency and much
lower exterior magnetic fields over traditional laminated steel core
transformers. The HA-1's toroidal linear power supply provides a
very clean and robust power source to the audio components.
– The DAC is one of the most important
components for digital audio playback. The SABRE32
Reference ES9018 from ESS Technology is the world’s best
performing 32-bit audio DAC solution targeted for high-end
consumer applications and professional studio equipment. With
the ESS patented 32-bit Hyperstream™ DAC architecture and Time
Domain Jitter Eliminator, the SABRE32 Reference DAC
delivers an unprecedented DNR (Dynamic Range) of up to 135dB and
THD+N (Total Harmonic Distortion plus Noise) of -120dB, the
industry’s highest performance level that will satisfy even the
most demanding audio enthusiast. To learn more about the
technologies behind the exceptional performance of the SABRE
DAC, please read the
Asynchronous USB DAC
- By bypassing the low fidelity, poor quality DAC of traditional
computer soundcards, the HA-1 turns any computer into a high
performance multi-media source by converting digital audio to
analog through the ESS Sabre32 Reference DAC. The
asynchronous transfer mode uses the high precision clock inside
the HA-1 to drive the audio signal, not relying on the clock
quality of the computer. HA-1's USB DAC input supports PCM up to
384 kHz 24-bit and DSD up to 12 MHz (DSD256).
Made for iPod®, iPhone® and
– The HA-1 passes Apple's "MFi" certification and
is compatibile with the latest iPod, iPhone and iPad to be used
as the digital audio output accessory of these devices. By
tapping directly into the digital audio signal of these devices
and converting the audio to analog using the high performance
SABRE32 Reference DAC, music from your favorite
portable device will sound its best.
Wireless Audio via Bluetooth
- The HA-1 supports Bluetooth Advanced Audio Distribution
Profile (A2DP) with both the standard and aptX® high quality
codec. Simply pair your phone with the HA-1 and set music free
wirelessly from your mobile phone.
Stereo Pre-Amplifier with Home Theater Bypass
- The HA-1 doubles as a high fidelity
stereo pre-amplifier with both RCA and XLR output ports. A
special "Home Theater Bypass" mode can be assigned to any input
source, making it very easy to integrate the HA-1 as a stereo
pre-amplifier into a home theater sound system.
Trigger Input & Output
– The HA-1 features 12V trigger input and output. When used as a
stereo pre-amplifier, the trigger output can turn on your power
amplifiers automatically when the HA-1 is turned on. You can
also turn on the HA-1 automatically by connecting its trigger
input to the trigger output of a source device or a surround
Remote Control & App
– The HA-1 comes with a remote control that provides volume
control, direct source selection and even playback control for
digital audio sources. A remote control app is available for
both Apple's iPhone and Android-based smartphones. The app works
over Bluetooth and offers the same functionality as the physical
Adjustable Gain Setting
– The headphone power amplifier has an adjustable gain setting.
For optimal sound quality and to best match your headphones'
sensitivity, you can choose between Normal and High for the
Headphone Gain setting.
HA-1 is housed in a brushed aluminum chassis. The Class A
amplifier naturally consumes more power and generate more heat
than other types of amplifiers, so the HA-1 is designed with
ample ventilation and built with the finest components to ensure
long term stability and performance. Tipping the scale at 13
lbs, the HA-1 is a solidly built desktop headphone amplifier.