iBasso AMP7 Discrete Single Ended Amplifier Card

Description

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When using OPAMPs to develop an amplifier, it is almost impossible to achieve high voltage output and high current output, especially, on a portable devices. Some engineers have used the TPA6120 in the buffer stage to achieve 750mA output current. However, the TPA6120 has a 10ohm output impedance, which isn’t ideal for low impedance IEMs or headphones.

So, iBasso decided to use discrete components which are usually used in desktop amplifiers to develop the iBasso AMP7 amp but the development process is much more difficult when using discrete components.

Low VCE transistors are utilized and are manually sorted and paired, providing better consistency and linearity. The low VCE also expands the linearity range.

+/-8V high voltage swing. This significantly improves dynamics and headroom, resulting in a more accurate sound that is true to the recording.

The transistors used on the buffer stage have a up to 2700mA output current rating, which allows the AMP7 to drive IEMs and headphones that require high current with ease.

Features

• AMP7 is a complete new discrete circuit design that based on our four channel architecture and features both a high voltage and current output. High current output is very useful for low impedance multi drivers in-ear monitors.
• Low VCE transistors are utilized and are manually sorted and paired, providing better consistency and linearity. The low VCE also expands the linearity range.
• +/-8V high voltage swing. This significantly improves dynamics and headroom, resulting in a more accurate sound that is true to the recording.
• The transistors used on the buffer stage have a up to 2700mA output current rating, which allows the AMP7 to drive IEMs and headphones that require high current with ease.

Specification

Phone Out:

• Output Voltage: 3.2Vrms
• Frequency Response: 10Hz-45KHz +/-0.3dB
• S/N: 122dB
• THD+N: 0.00023%, -113dB (no [email protected]) 0.00023%, -113dB (300Ω@1.8Vrms)
• Output Impedance: 0.3ohm
• DNR: 122dB
• Crosstalk: -106dB

Line Out:

• Output Voltage: 3.2Vrms
• Frequency Response: 10Hz-45KHz +/-0.3dB
• S/N: 117dB
• THD+N: 0.00023%, -113dB (no [email protected])
• DNR: 117dB

Average Play Time: 7.5hours (Play time varies with different sample/bit rates, volume and headphone/IEM loads.)