Features 1、Amplifier Retrofit: This preamplifier board is suitable for retrofitting of systems which pre stage outputs balanced signal and post stage inputs no balanced signal, and of various power amplifier without balanced input. 2、High Accuracy: This amplifier board is laser trimmed inside, with an accuracy of up to 0.0001%, ensuring the device has high gain accuracy. 3、Excellent Performance: This amplifier board also has low distortion and parasitic interference, excellent common mode noise rejection. 4、High Conversion Efficiency: The conversion circuit performance is higher than made of 5532 op amp, has low offset error performance. 5、Cross Coupled Structure: Using a cross coupled electronically balanced structure, can emulate the performance of full balun solution for line drives. Specification Item Type: Balanced to Unbalanced Preamplifier Board Material: PC Model: SSM2141 Input Voltage: DC dual 12-15V (recommended voltage ±12V) Size: Approx.86x49mm/3.4x1.9in Features: 1. Based on for Sonic Frantiers preamp circuit 2. Input balanced signal, output unbalanced signal Package List 1 x Balanced to Unbalanced Preamplifier Board 12 x Bolt 6 x Nut