Behringer ULTRA-DI Pro DI4000 DI BoxULTRA DI PRO DI 4000 The ULTRA DI PRO DI4000 gives you 4 first class DI channels in a single rack space. Each channel is equipped with two Inputs (XLR and " TRS), a balanced XLR Output and a " Link output to connect to your amp or monitor console. Plus, the DI4000 is designed to accommodate virtually any input signal, up to 40 dB of switchable input attenuation and up to 20 dB of gain, while our highly acclaimed OT 1 output transformers ensure