Home Slickdeals Monolith by Monoprice THX AAA 887 Balanced Headphone Amplifier featuring Technology (open... Slickdeals Monolith by Monoprice THX AAA 887 Balanced Headphone Amplifier featuring Technology (open box) $75.54 w/Add On + Free Ship By ARCOM - 15 August 2023 42 0 SHARE Facebook Twitter Go to the deal page: Monolith by Monoprice THX AAA 887 Balanced Headphone Amplifier featuring Technology (open box) $75.54 w/Add On + Free Ship