Topping A50s Headphone Amplifier single-end 6.35mm SE 4.4mm balanced output 20ohm preamplifier 0db/6db/12db NFCA 3500mv*2 preamp
Topping A50s Headphone Amplifier single-end 6.35mm SE 4.4mm balanced output 20ohm preamplifier 0db/6db/12db NFCA 3500mv*2 preamp