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) $99.99 + Free Ship By ARCOM - 23 June 2023 17 0 SHARE Facebook Twitter Go to the deal page: Monolith by Monoprice THX AAA 887 Balanced Headphone Amplifier featuring Technology (open box) $99.99 + Free Ship