Topping LA90-Discrete Amplifier 2x100W 4 Ohm

Topping LA90-Discrete Amplifier 2x100W 4 Ohm

The Topping LA90 Discrete builds upon the excellence of the original LA90, replacing integrated circuits with fully discrete components for even greater sonic precision. This high-end Class AB amplifier delivers an exceptionally detailed and transparent listening experience, ensuring faithful sound reproduction that meets the demands of both audiophiles and studio professionals.

While the standard Topping LA90 relies on integrated circuits (ICs) as its main amplification elements, the LA90 Discrete uses individual transistors, resistors, and capacitors. This discrete design allows for finer optimization and more precise control over the amplification process, resulting in enhanced sound quality and improved tonal accuracy.

Specifications

Product type: Discrete amplifier

Inputs: 3 × Combined 6.35 mm TRS / XLR

Outputs: Speaker terminals

Measurements

Parameter | Stereo | Mono

THD+N @ 1kHz (A-weighted): < 0.00009% @ 4Ω 5W | < 0.0002% @ 4Ω 5W

< 0.00009% @ 8Ω 5W | < 0.0001% @ 8Ω 5W

THD+N @ 20Hz–20kHz, 90kBw (A-weighted): < 0.0005% @ 4Ω 5W | < 0.0007% @ 4Ω 5W

< 0.0003% @ 8Ω 5W | < 0.0005% @ 8Ω 5W

SNR (A-weighted): 141 dB | 143 dB

Dynamic range (A-weighted): 141 dB | 143 dB

Frequency response:

20Hz–40kHz (±0.2 dB) | 20Hz–40kHz (±0.2 dB)

10Hz–100kHz (±0.4 dB) | 10Hz–100kHz (±0.4 dB)

Output level:

51 Vpp @ 4Ω | 80 Vpp @ 4Ω

58 Vpp @ 8Ω | 106 Vpp @ 8Ω

Noise (A-weighted):

< 1.8 µVrms @ G=L | < 2.5 µVrms @ G=L

< 3.4 µVrms @ G=H | < 4.8 µVrms @ G=H

Channel crosstalk @ 1kHz: -138 dB | —

Input sensitivity:

7.3 Vrms @ G=L | 6.9 Vrms @ G=L

2.2 Vrms @ G=H | 2.2 Vrms @ G=H

Gain:

9.44 dB @ G=L | 15.4 dB @ G=L

19.4 dB @ G=H | 25.4 dB @ G=H

Channel balance: 0.2 dB | —

Output impedance: < 3 mΩ | < 5 mΩ

Output power:

2 × 120 W @ 4Ω THD+N < 10% | 1 × 180 W @ 4Ω THD+N < 1%

2 × 10 W @ 4Ω THD+N < 1%

2 × 66 W @ 8Ω THD+N < 10% | 1 × 220 W @ 8Ω THD+N < 10%

2 × 56 W @ 8Ω THD+N < 1% | 1 × 180 W @ 8Ω THD+N < 1%

Load impedance: ≥ 4Ω | ≥ 4Ω

General information

Dimensions: 220 × 205 × 90 mm

Package contents:

1 × Topping LA90 Discrete amplifier

1 × Power supply

1 × Speaker jumper cable