Cheap And Discounts Meixing MC34-B 22W*2 combined type and headphone power amplifier 6P3*4, 6N1*2, 6N2*2, Frequency range: 20Hz~40KHz Wholesale. Buy Directly From Merchant Karry Amplifier Audio Store. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.