iBasso AMP7/AMP8

iBasso AMP7 HiFi Audiophile Discrete Single Ended Amplifier Card for iBasso DX150 DX200

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 load@1.8Vrms)

        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 load@1.8Vrms)

DNR: 117dB

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

iBasso AMP8 Discrete Balanced Headphone Amplifier Card for iBasso DX150 DX200

Features

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

AMP8 is a complete new discrete circuit design that is dedicated to the DX150/DX200 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.

The transistors used on the buffer stage have a 2700mAh output current rating, which allows the AMP8 to drive IEMs and headphones that require high current with ease.

A Pentaconn 4.4mm balanced output port is used. The large double contact area of this socket contact lowers resistance and allows better current transmission.

Specification

Output Voltage: 6.2Vrms

Frequency response: 15Hz-45KHz +/- 0.3dB

S/N: 125dB

THD+N: 0.00023%, -113dB (no load@2.5Vrms)

       0.00023%, -113dB (300Ω@2.5Vrms)

Output Impedance: 0.38ohm

DNR: 125dB

Crosstalk: -120dB

Average Play Time: 7 hours (Play time varies with different sample/bit rates, volume and headphone/IEM loads.)

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, we decided to use discrete components which are usually used in desktop amplifiers to develop the AMP7 but the development process is much more difficult when using discrete components. After long development period and with our final design, we present the AMP7 card that has both high voltage and high current output and at the same time maintains low output impedance with extremely good measurements. AMP7 complements the premium performance of the DX150 and the DX200, giving you even more choices when playing the music you enjoy.