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QH1 Fully Balanced Preamp & Portable Desktop Headphone Amplifier

14 pairs of FZT power transistors for discrete amplification | Switchable between Class A/AB modes
Audio Note KAISEI Audio Quality Electrolytic Capacitors | MUSES72323 lossless volume program control
Built-in battery reference-grade pure power supply | Dedicated separate external power supply enhancing sound performance
CNC-machined all-aluminum enclosure for enhanced shielding vibration isolation | "Always Aiming for the Better" design philosophy

Scenario 1

As a desktop standalone headphone amplifier for the QA390 (MOD/LE)

Scenario 2

As a desktop/tabletop headphone amplifier for a desktop audio source

Scenario 3

As a portable/tabletop headphone amplifier for a portable player

Scenario 4

As a pre-amplifier to drive a power amplifier or active speakers

01 Featuring the high-performance FZT power transistors.
02 Enhanced sound quality and drive capability.
03 14 pairs of transistors in parallel to boost current output.
04 Optimized drive capability for both high-impedance and low-impedance headphones.
05 Delivering detailed and refined sound even at high power levels, avoiding harshness.
06 Producing sound that is three-dimensional, high-density, delicate, smooth, and well-defined.

01 Single-ended input that is first converted into a balanced signal, allowing single-ended input to benefit from the advantages of fully balanced operation.
02 Fully balanced transmission eliminating common ground line and common-mode noise, resulting in more stable sound.
03 Improved signal-to-noise ratio and expanded dynamic range for better presentation of micro-dynamics of music.
04 Complete separation of left and right channels reducing crosstalk.
05 Enhanced sense of spatiality and a wider soundstage, bringing the music vividly to life.
06 Balanced Transformer Less (BTL) amplification theoretically providing 4 times the power of single-ended amplification.
07 Increased voltage driving capability easily supporting high-impedance headphones.

01 The separate design where the large desktop headphone amplifier is split into two separate units: the amplifier and the power supply.
02 The design isolating interference, optimizing vibration reduction, and saving desk space.
03 Separate power supply with 80W toroidal transformer , equivalent to many large independent headphone amplifiers.
04 The built-in battery enabling you to enjoy high-quality music anytime, anywhere.

01 The menu provides options including Class A or Class AB amplification.
02 One device, two distinct sound styles.
03 Class A offers a warm, smooth sound, while Class AB delivers a lively sound.

Note: Since Class A generates more heat, only Class AB is available when using battery power.

01 Carefully selected Audio Note Kaisei electrodeless electrolytic capacitors are used.
02 Expensive, but they give the sound a refined, noble character pleasant and enduring.
03 The sound is delicate, rich, full, slightly warm, and smooth.
04 Parallel connected with WIMA MKP10 film capacitors.
05 They enhance high-frequency extension while maintaining a more balanced and stable sound.
06 The "rare" sound performance reflects an uncompromising pursuit of quality.

01 Each of the two channels uses a separate MUSES72323 chip, reducing crosstalk between channels.
02 With noise as low as 0.63uV, only 1/4 of that of the PGA2311UA, it suits both earphones and large headphones.
03 An ultra-low distortion of 0.00024%, with program control analog switching, ensures lossless sound quality.
04 It offers fine adjustments in 0.25dB steps, with a wide range from 0 to -111.75dB, for precise control.
05 At low volumes, the sound quality remains intact, with no left-right imbalance. The electronic control ensures long-lasting durability.

01 It's not that the amplifier "creates" new sound details out of nothing.
02 But rather, it optimizes design so that existing details can be fully revealed.
03 It's like wiping dust off a painting to recover the vivid details and colors.
04 The signal might lose details at each stage of its path.
05 From circuit design, objective parameter guarantee, power supply, to component selection.
06 Down to the smallest resistor, PCB material, internal signal wires, operational amplifiers, and soldering.
07 They all have to ensure that no musical note is lost.
08 The R&D phase of QH1 was like a battle to protect sound details.
09 It is this meticulous craftsmanship that gives QH1 its high-density sound.

01 In case that users might affect sound quality with their own signal cables.
02 QH1 carefully selects cables to create XLR signal cables for audiophiles.
03 The separate power supply also comes with audiophile aviation cable s and DC cables.
04 No hassle for the user, just simple and great sound.

01 The preamp output offering the same high performance as the headphone amplifier.
02 The single-ended output impedance: 47 , and the balanced output impedance: 94 .
03 Optimized for active speakers, delivering a natural and expansive sound.
04 Independent volume memory (selectable in 200 steps).
05 With an infrared remote control for more convenient operation.

01 Equipped with RCA and XLR inputs for desktop use.
02 Along with 3.5mm single-ended and 4.4mm balanced inputs.
03 Easy connection with portable players.

01 Dedicated aviation connector for the separate power supply, with three sets of analog and digital isolated voltage inputs.
02 The DC port supports 12V universal linear or switching power supply input.
03 The internal battery provides 8-16 hours of clean power for a pure listening experience.
04 All these three power supply options allow for exploring more sound possibilities and greater versatility.

01 When mains power is interfered and affects sound quality, switch to the built-in battery for a pure power supply.
          No more staying up late just to enjoy clean sound enjoy every moment of music anytime.
02 When testing out different peripherals, battery power acts as a "touchstone."
03 A portable desktop amp enables high-quality music enjoyment at any time, from anywhere.
04 No more overpowering sound from desktop amps delicate and refined sound for small earphones.
05 A battery-powered preamp makes audiophiles' dreams come true.

01 Low internal resistance power battery with 40A current output capability.
02 Multi-MOSFET parallel protection circuit with internal resistance as low as 5 milliohms.
03 Using Linear 's industry-leading boost converter in combination with Panasonic power inductors.
04 The battery-powered unit can provide 15V analog power similar to a separate power supply.
05 The full-link low internal resistance design ensures high current output even at high voltages.

01 Integrated housing with 18 screws tightly securing the bottom plate.
02 The high-density integrated structure ensuring excellent shock and vibration resistance.
03 Worry-free vibration isolation, allowing for the safe stack of equipment.
04 Thick, fully enclosed housing with precisely spaced seams blocked.
05 The shielding function, keeping interference completely out.

01 Output DC protection with a low threshold of 0.3V.
02 Optimized specifically for IEMs (in-ear monitors).
03 Headphone impact protection circuit for power on/off.
04 Three major intelligent protections: over-temperature, overload, and DC.
05 Continuously guarding your headphones.

01 Low, Medium, and High gain levels with quick menu switching.
02 Flexible matching for different headphones, easily handling both headphones and earphones.
03 High gain provides up to 12 times voltage amplification, adding vivid and dynamic performance for high-impedance headphones.
04 Low gain offering extremely low noise output, optimized for IEMs (in-ear monitors).

01 Menu operated via a clear and convenient touchscreen interface.
02 Independent volume control knob for more precise and timely adjustments.
03 One-touch mute for elegant handling in various situations.

01 The design philosophy based on the "Always Aiming for the Better" approach.
02 Ample current reserve to reduce power supply impedance and minimize output ripple.
03 Irish Talema low-impedance 80W toroidal transformer dedicated to analog circuits.
04 Independent transformer for control and display, isolated from the analog power ground.
05 LT1084/1033 in replacement of conventional 317/337, to achieve superior ripple suppression and lower power output noise, although the cost is several times more expensive.
06 Philips, Sprague electrolytic capacitors, WIMA , Siemens, and ERO film capacitors.
07 Full-range noise filtering and high-speed energy storage for low, mid, and high frequencies.
08 Pure, low-impedance, high-transient power supply delivers an overwhelming sense of sound spaciousness.

THD+N and SINAD Measurements:

Dynamic Range Measurements:

Maximum Power Measurement with 16-Ohm Load on Headphone Balanced Output

Note: Due to individual product variations, the parameter data obtained from this measurement only represents the specific unit tested. Please be aware of this for reference, and consider that the actual product specifications should be based on the values indicated in the "Specifications" section.

QH1 Packaging List
QH1, remote control, user manual, DC-12V power adapter, and two 0.35-meter balanced connection cables.

QH1-LPS Packaging List
QH1-LPS, user manual, AC power cable, 5Pin-DC connection cable, and 5.5*2.1-DC connection cable.

Price:

QH1(Without QH1-LPS):  US $1300.00 (Not included shipping)
QH1(With QH1-LPS):  US $1900.00 (Not included shipping))