A well-known Chinese brand has released the L30 headphone amplifier. The device does not pretend to be a flagship, it does not have balanced interfaces, it is offered on the world market for only $139.99, but it pleasantly surprises with its technical characteristics. Output power – 2 x 3500 mW at 16 ohms or 2 x 2400 mW at 32 ohms. In combination with an output impedance of 0.1 Ohms, this allows it to realize the potential of current-hungry low-impedance and low-sensitivity headphones (for example, planar). The signal-to-noise ratio is no worse than -125 dB, and the load impedance is from 8 to 600 Ohms. The level of harmonics and noise (THD+N) <0.00007%. The dynamic range is at least 141 dB. Note that this data has already been confirmed by independent resources.
The device is built on proprietary NFCA (Nested Feedback Composite Amplifier) modules, which were previously used in the flagship A90 amplifier. The essence of this rather popular technology is to reduce distortion by increasing the depth of the local OOS at the minimum values of the total OOS. The amplifier also uses proprietary uhgf (Ultra High Gain Feedback) circuitry with a hybrid current and voltage feedback architecture.
The versatility of the amplifier in terms of working with headphones of different sensitivity is provided by a three-position gain switch (-9.9 dB/0 dB/9.5 dB). You can use the device as a pre-speaker (volume control) with active acoustics or end amplifiers.
The power supply is external, which allows you to improve the sound of the device due to a more powerful and high-quality adapter.