MSD-72 Series User’s Guide849.8.9 Test toneMenu Top → AUDIO → TEST TONESetting for Each output channelSetting valueTest tone:OFF [Default],1kHz ,400HzSpeaker:・ALL [Default] ・LOW FREQUENCY EFFECT・FRONT L/R ・FRONT CENTER・REAR L/R ・REAR LEFT・REAR L/R CENTER ・REAR RIGHT・FRONT LEFT ・REAR LEFT CENTER・FRONT RIGHT ・REAR RIGHT CENTERSince test tone can be output only to specific speakers, you can check the position of the speakers.For “LOW FREQUENCY EFFECT”, only test tone of 30 Hz is output.【See: 9.9.6 Speaker configuration】