the Tech
ZEN CAN
Designing an OK headphone amplifier is easy.
Boutique Op-Amp + Output Stage + Vol c power supply = voila!
But this is approach is not ideal.
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Fixed gain creates more noise
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Single signal input with lack of load matching means limited source flexibility
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Lack of EQ & sound-field corrections hampers listening enjoyment
Designing a one-of-a-kind balanced headphone
amplifier like the ZEN CAN is not.
Inputs
o
A dedicated input circuit stage pairs sources & adjusts levels to match
eg Pentaconn 4.4. at 24k Ohm/high impedance and a 1M Ohm for SE input avoids
loading the source, the amplifier remains in Class A operation for lowest distortion
Class A Balanced/SE amplifier
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Draws heavily from the iFi’s flagship Pro iCAN, using the same discrete Class A
output buffer combined with a J-FET Op-Amp (OV2637A)
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Super-low loading means exceptionally low distortion
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FET input avoids loading volume control – low distortion/noise
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Low impedance feedback circuit enhances circuit performance and totally avoids
resistor noise
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Output amplifier gain of four steps in +6dB perfect for headphone matching
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Output stage drives headphones effortlessly and least noise/distortion
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Full protection of headphones/amplifier from overload/shorts
