have tosh sd110e dvd player (coax only) and nad 540 cd player (coax only) as both dvd and my cd player only have coax only connection could i use r/sounds dac £99 with my nad cd player as i believe dac has optical connection and i believe a bnc? connecter is there a converter type box, coax to bnc cable, i would like the benifit of hdcd , as cd player was £230 new, would £99 dac be cost effective improvment,providing it can somehow be linked to nad540,your advice would be welcome, local rshas not got any in store so i would have to purchase from website,but woulkd like advice first,thank you all