Glensound U2B 4 Twin Stereo Unbalanced To Balanced ConverterThe Signature U2B4 is a broadcast specification twin stereo unbalanced to balanced analogue audio interface that is equally suitable for professional & home studio use. Its primary job is to interface domestic type audio outputs (unbalanced) to the balanced audio inputs on broadcast and professional audio equipment. As well as providing a balanced interface the U2B4 also provides variable gain loss to allow the lower level audio outputs produced by