Home Slickdeals Monoprice Monolith THX AAA Balanced Headphone Amplifier w/ 887 Technology $249.99 +... Slickdeals Monoprice Monolith THX AAA Balanced Headphone Amplifier w/ 887 Technology $249.99 + Free Shipping via Monoprice By ARCOM - 12 August 2021 61 0 SHARE Facebook Twitter Go to the deal page: Monoprice Monolith THX AAA Balanced Headphone Amplifier w/ 887 Technology $249.99 + Free Shipping via Monoprice