Home Slickdeals Monoprice Monolith: Liquid Platinum Headphone Amp $600, 10″ 500W Powered Sub $425... Slickdeals Monoprice Monolith: Liquid Platinum Headphone Amp $600, 10″ 500W Powered Sub $425 & More (eBay App Req.) + Free S/H By ARCOM - 21 November 2018 155 0 SHARE Facebook Twitter Go to the deal page: Monoprice Monolith: Liquid Platinum Headphone Amp $600, 10″ 500W Powered Sub $425 & More (eBay App Req.) + Free S/H