external
external
external
external
external
external
external
external
external
external
external
external
external
external
external
external
external
external
external
external
external
external
external
external
external
external
external
external
external
external
external
external
external
external
external
external
external
external
external
external
external
external
external
external
external
external
external
external
external
external
external
external
external
external
external
external
external
external
external
external
external
external
external

Loudspeakers

external
external
external
external
external
external
external
external
external

Amplifiers

external
external
external
external
external
external
external
external
external
external
external
external
external
external
external
external

Streamers

external
external

Turntables

external
external
external
external
external

Cartridges

external
external
external
external
external

AV receivers

external
external
external
external
external
external

Headphones

external
external
external
external
external
external
external

Headphone amps

external
external
external
external
external
external