The Limetree HEADPHONE is a high-class headphone amplifier for all music lovers who want to get a higher resolution and more tonal colors from their headphones.
It amplifies purely in the analog domain for superior quality with the smallest of signals and/or when listening at soft volume. High-current output stages in class-A technology guarantee a reproduction which is both punchy and precisely resolved. For true connoisseurs!
Beside three inputs to connect e.g. network players, CD players or a phono preamp, the Limetree HEADPHONE offers a headphone output and a line output to control active speakers or a power amplifier.
Almost any headphones of 20 to 300 ohms can be driven with great sounding results. A setting device on the bottom of the housing allows to adjust the volume level to the respective headphone impedance.
We have put a good deal of detail work into the circuit design. Very short signal paths, finest components and an extremely clean supply voltage make this amplifier what it really is: an essential tool for headphone freaks.
The analog volume control comes from the studio sector and is currently representing the measure of all things. It ensures a very high resolution and minimal losses with low-level signals.
The current amplification is provided by completely discrete “diamond” buffers working in a non-feedback class-A mode. In terms of sound these are wonderfully agile and detailed and deliver very good dynamics values.
As power supply we use a “medical grade“ wall plug transformer which ensures a particularly good isolation from line disturbances. Together with the elaborated onboard filtering and special voltage regulators, we were able to realize an exceptionally low-noise power supply with a ripple voltage below 10 µV.
Measurement conditions: 22 °C, 230 V mains voltage, Audio Precision AP2722
Power consumption: 0.15 W standby, 2.6 W operation
Dimensions (W x H x D): 107 x 40 x 130 mm (4.2 x 1.6 x 5.1 in)
Weight: 295 g (10.4 oz)
Inputs: 3 RCA inputs
Outputs: 1 headphone output, 1 line output
Gain: 12 dBs (10 kOhms load)
Distortions: <0.001 % (at 0.5 V output and 10 kOhms load)
S/N ratio: >98 dBV (A-weighted, 600 ohms termination)
S/N ratio MC: >78 dBV (A-weighted)
Frequency response: 1 Hz – 300 kHz (-3 dB)
Input impedance MC: adjustable in six steps (100, 130, 160, 200, 400 and 800 ohms)