Quloos QH1

Separated Circuit Power Amplification

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

Fully Balanced Architecture

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

Two-in-One Solution Available for Desktop/Tabletop and Portable Use

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

Internal Battery Powered Supply

• Class A and Class AB Modes Selectable
• The menu provides options including Class A or Class AB amplification.
• One device, two distinct sound styles.
• 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.

Coupled Capacitors Matter

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

MUSES72323 Program Control of Analog Volume

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

Noise Comparison

Why does a good headphone amplifier reveal more sound details?

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

Audiophile Matching Cables

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

Note: Longer or alternative signal cables can be purchased separately.

Available for Preamp Output

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

Four Input Methods

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

Note: Input and cannot be connected to signal sources at the same time, the same applies to and .

Three Power Supply Options

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

Reasons for a Desktop Headphone Amp to Have a Built-in Battery

• 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.
• When testing out different peripherals, battery power acts as a 'touchstone.'
• A portable desktop amp enables high-quality music enjoyment at any time, from anywhere.
• No more overpowering sound from desktop amps delicate and refined sound for small earphones.
• A battery-powered preamp makes audiophiles' dreams come true.

Built-in Battery Power Comparable to Separate Power Supply

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

Solid Aluminum CNC Housing

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

Comprehensive Headphone Protection Circuit

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

Three Gain Levels, Featuring

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

Touchscreen Operation

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

Dedicated Linear Power Supply

• The design philosophy based on the 'Always Aiming for the Better' approach.
• Ample current reserve to reduce power supply impedance and minimize output ripple.
• Irish Talema low-impedance 80W toroidal transformer dedicated to analog circuits.
• Independent transformer for control and display, isolated from the analog power ground.
• 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.
• Philips, Sprague electrolytic capacitors, WIMA , Siemens, and ERO film capacitors.
• Full-range noise filtering and high-speed energy storage for low, mid, and high frequencies.
• Pure, low-impedance, high-transient power supply delivers an overwhelming sense of sound spaciousness.

A  1.9-inch Capacitive Touch Display B  Power Switch (Long Press) / Volume Knob (Rotate) / Mute Switch (Short Press) C  XLR Balanced Headphone Output D  6.35 Single-Ended Headphone Output E  4.4 Balanced Headphone Output

A  XLR Input (Pin 1: GND, Pin 2: +, Pin 3: -) B  3.5 Line-in C  RCA Input D  RCA Preamp Output E  XLR Preamp Output  (Pin 1: GND, Pin 2: +, Pin 3: -) F  QH1-LPS DC Input G  DC 12V Input  (Power/Fast Charging, Plug Size 5.5*2.1mm) H  Type-C Charging I  Firmware Upgrade Button J  4.4 Line-in K  Reset Button

QH1-LPS

A  Power indicator

A  Power switch: Controls the turning on or off of the entire machine's power. B  Input fuse: In cases of damage, replacement by a qualified technician with precise specifications is mandatory. C  AC power input: Please make sure that the local grid supply voltage corresponds to the input voltage indicated on the machine. D  GND Post: For connecting to a ground boxes. E  DC output 1: for QH1. F  DC output 2 For other devices, such as the QA390.