Introduction function: input balance signal, unbalanced output signal, suitable for the front stage is balanced signal output, and the rear stage has no balanced signal input for the rear stage system, and power amplifier without input balance Chip Description: The internal interior of the SSM2141 is cut to an accuracy of 0.0001%. In terms of distortion and noise, as well as parasitic interference, its performance has certainly reached "professional level". The performance of the conversion circuit made using the 5532 op amplifier has been greatly improved. Excellent chip rejection for excellent common mode noise rejection and offset error performance ensuring high gain precision. The SSM2141 features an electronically balanced -coupling topology that simulates the performance of a balanced transformer solution for line drive. Product details: Dual channel stereo Input voltage: dual DC 12-15V (recommended voltage: positive 15-0-negative 15) Based on the Frantiers preamplifier circuit. Input balanced signal, output unbalanced signal Colour:Blue Material:PC+Metal Size:89*49MM Package Contents: 1* Amplifier Board Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.