TOPPING A90 Discrete Balanced Headphone Amplifier & Pre-amplifier

 Features:->Fully-Discrete NF modules.>Headphone amp and Pre-AMP application.>4-Pin XLR+4.4mm Balanced+6.35mm SE Output.>Precise Relay volume control.>Two-level gain settings.>Superb performance with Ultra-low THD+N 0.000055%.>Excellent dynamic range of 145dB.>Tremendously powerful(Output rating 9800mWx2).>Extendable Via EXT90.Packing an ultimate performance with fully-discrete NF modules the all-new Topping A90 Discrete headphone amplifier is here. Topping has used fully discrete components to redesign its famous NF(Nested Feedback Composite Amplifier) module. The A90 Discrete has got four built-in NF discrete modules each of them featuring 39 transistors building up a fully balanced structure. With this discrete component circuitry the A90 Discrete packs a tremendously powerful output producing about 9800mW of clean noise-free output ratings at 16Ω of load. Topping A90 Discrete works flawlessly with EXT90 extender adding three XLR connections and one R connection. Topping A90 Discrete is designed to be there with high-end desktop chains!!Fully Discrete NF Modules:-Topping has redesigned the famous NF(Nested Feedback Composite Amplifier) module with fully discrete components. The A90 Discrete houses four NF-Discrete modules that adopt 39 transistors building up a fully-balanced circuitry producing powerful amplification to the supplied signal. This discrete structure is supported by optimized Voltage Current hybrid feedback architecture along with UHGF(Ultra-High Gain Feedback) technology providing excellent DC and AC performance. With this fully discrete design the output capability of the A90 Discrete is stronger than ever providing a tremendously powerful signal amplification.Both Balanced & Single-Ended Headphone Connections:-Topping A90 Discrete houses three headphone output ports. It supports both single-ended as well as balanced headphone connections with a 4-pin XLR and 4.4mm Balanced connections and a 6.35mm single-ended connection. The amplifier is designed to cater to the needs of both low-power requiring as well as demanding headphones. It provides high output voltage high current and low output impedance allowing the users to pair any headphones with the A90 Discrete.Super-Clean Performance With Low Harmonic Distortion:-Topping A90 Discrete is a highly-powerful headphone amplifier. It's not all about the power with the A90 Discrete. It maintains ultra-low distortion even at its peak load. Talking about the specs here Topping A90 achieves <0.1% THD+N at 6700mW of peak power at 32Ω of load. Pairing 300Ω headphones it maintains an ultra-low distortion of <0.00003% at 950mW of load.Two-Level Gain Settings:-Topping A90 Discrete has got two-level gain settings. Low gain is suitable for IEMs and Headphones with high sensitivity while high gain can be used to drive high-power requiring full-sized headphones. In a single-ended connection the low gain is at 0dB and high gain at 9.5dB. Balanced output connections have 6dB of gain at the low-gain level and 15.5dB of gain at the high-gain level.Ground Loop Noise Eliminator:-The ground loop might introduce some unwanted noise into the output signal that might ruin the experience for users. Topping A90 Discrete has got a GND/LIFT switch to rectify this problem. If you notice Ground Loop noise simply switch it to Lift and A90 Discrete will eliminate the ground noise for you.Works as a Pre-AMP too:-Topping A90 Discrete works as a pre-amp too. When switched to pre-amp mode expect a true high-end performance same as its headphone amp mode. It has 20Ω SE and 40Ω balanced output impedance. It can be used as a pre-amp and as a headphone amp simultaneously with no degradation in sound performance.