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April Music - Stello HP100 MKII - Pre/Headphone Amplifier

April Music - Stello HP100 MKII - Pre/Headphone Amplifier - Front
April Music - Stello HP100 MKII - Pre/Headphone Amplifier - Front April Music - Stello HP100 MKII - Pre/Headphone Amplifier April Music - Stello HP100 MKII - Pre/Headphone Amplifier

April Music - Stello HP100 MKII - Pre/Headphone Amplifier

Celebrating the 15th Year Anniversary, April Music announces the stello HP100 / S100 MKII, the culmination of advancement in technology and sound.

Designed for entry into high-end audio reproduction, the new stello performs several levels higher than the intended pricing. Bridging the gap between HiFi and Audiophile, the MKII shows the hidden depth of music.

The stello HP100 / S100 Series is the answer to your passion, the advanced reproduction of sound.

Pure & Simple

These are the intended purpose of stello HP100 MKII. Focusing on the fundamentals, the MKII produces high-end performance sound at sensible price.

Powerful Toroidal transformer

The stello HP/100 Headphone / Preamp utilizes exclusively designed toroidal transformer, assuring stable input-voltage for strong dynamics and subtle nuances of music. And, in order to maximize the design potential, the balanced input connectors are employed, further lowering the noise level.

Beauty of Iron

Alex Rasmussen, the principle architect of the EXIMIS chassis, continues the unique design concept of April Music in the stello 100 MKII series.

Pure A class amplifier

The stello HP100 MkII is equipped with pure class A, Push-Pull output circuitry. The J-FET - Low Noise transistor is applied to the input section of the preamp.

The Bipolar transistor scheme is used in the headphone output and it provides exceptional sound and dynamic drive. The input impedance ranges up to 1 mega Ohms and can be connected to all types of interconnect cables, providing very stable operation. Apart from the DC Servo Control circuit in the headphone amp section, the entire preamp board is designed with discrete circuitry for fine tuning and elevated sound quality.


The stello HP100 MKII reproduces remarkably precise and articulate sound of sheer musicality. The ability to faithfully delineate the ultra high resolution software of advanced digital recording enhances any audio life-style, be it Desk-Fi or PC-Fi or Head-Fi.


The first note paints the wide sound stage. The depth the MKII creates is astounding. The soundscape it draws is accurate, painted by expressive mids to lively lows.


Alex Rasmussen, the celebrated designer from America, created the stello MKII chassis by applying his trademark design principle of elegant beauty and compact solidity, providing the elevated music listening and pleasure of possession.


When matched to the source devices with balanced characteristics, the stello MKII based system will offer you the unexpected result. The neutrality of power amp will showcase the intense musicality of the HP100 MkII. Mating the HP100 MkII with the S100 MKII power amp, the stello system will realize the higher imagination.

Absolute Performance

April Music delighted the world with the introduction of stello DP200, DA220 and DA100 Signature and Eximus DP1 and, based on leading edge technology and innate experience, April Music introduces the stello HP100 / S100 MKII series.

The stello 100 MKII will reveal the clear-sophistication of music in palpable and spacious sound-field. The feeling is profound but natural, leading to extended auditioning without the listening fatigue.


Line inputs
        3 Pairs of unbalanced inputs(U1, U2, U3)

        Accepts up to 48 kHz sampling rates

Line outputs & headphone
        1 pair unbalanced, 1 pair balanced, 1 headphone output(1/4")

Front control & status display
        AC line power on/off push switch & power on LED, line input selection tacts switch, headphones amplifier FILTER on/off tacts switch & LED, volume control knob, display devices : 14 segments alphanumeric LED

Maximum power output for headphone
        0 Ohms : 1.5 Watts
        50 Ohms : 1.1 Watts
        150 Ohms : 490 mWatts
        300 Ohms : 245 mWatts
        600 Ohms : 120 mWatts

Input impedance
        1 Mega Ohms

Output impedance
        Line outputs : 50 Ohms

Power requirements
        100 ~ 117 VAC / 220 ~ 240 VAC, 50 or 60 Hz

        8.6 × 2.12 × 11 inch (WHD), 219 × 54 × 296 mm (WHD)

Weight (NET)
        8.82 lb, 4 Kg

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