Standing for Tabletop 73, the TT-73 from Heritage Audio is in essence a reformatted single channel DMA73, but widens the range of application to on-stage use, portable systems, hotel rooms, on-location recordings and more. With the TT-73, musicians are able to give 73-driven line levels to FOH engineers, using the front panel DI inputs. While on the road, they are able to record at the same studio quality level from hotel rooms or on the tour bus. Stage microphones can also be brought up to line level without using long cable runs. Special care has been taken with the internal worldwide power supply, which has been custom engineered to operate close to audio transformers with no noise induced. New to the range of tabletop units is the implementation of DI THRU jacks for simultaneous use of instrument amplifiers. A ground lift switch prevents any ground loops introducing hum in the audio when using these.