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  • Quloos QH1 - QH1

Quloos 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
  • CNC-machined all-aluminum enclosure for enhanced shielding vibration isolation
Regular price $1,298.00
Sale price $1,298.00 Regular price
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    • Estimated Delivery:Mar 18 - Mar 22

    Quloos QH1

    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.

    Technical Specifications

    Balance Port
    Single Port
    Input Level
    2~16Vrms @ 15V
    2~8Vrms @ 8V
    1~8Vrms @ 15V
    1~4Vrms @ 8V
    Gain
    0dB/6dB/21dB @BAL IN
    6dB/12dB/27dB @SE IN
    -6dB/0dB/15dB @BAL IN
    0dB/6dB/21dB @SE IN
    Output Impedance
    100K ohm
    100K ohm
    THD+N
    0.00011%
    0.00017%
    Dynamic Range
    127dB
    121dB
    Output Power QH1-LPS Powered
    9000mW + 9000mW @16
    8000mW + 8000mW @32
    1000mW + 1000mW @300
    3500mW + 3500mW @16
    2000mW + 2000mW @32
    270mW + 270mW @300
    Output Power Battery Powered
    6000mW + 6000mW @32
    1000mW + 1000mW @300
    2000mW + 2000mW @32
    270mW + 270mW @300
    THD+N
    127dB
    121dB
    HP Output Impedance
    < 0.4 ohm
    < 2 ohm
    Preamp Output Impedance
    94 @XLR
    47 @RCA
    Output Level
    17.5Vrms @ 15V 8.2Vrms @ 8V
    9Vrms @ 15V 4.3Vrms @ 8V
    Noise Floor
    3.5uVrms @Gain:L 4.5uVrms @Gain:M 25uVrms @Gain:H
    3.0uVrms @Gain:L 3.5uVrms @Gain:M 20uVrms @Gain:H
    Support Headphone Impedance
    8 - 600 ohms
    8 - 600 ohms

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