Description: Technology Test Tone Square Wave 4Khz 60 Seconds -18Db Loop.

Description: Technology Test Tone Square Wave 4Khz 60 Seconds 0Db Loop.

Description: Technology Test Tone Square Wave 500Hz 60 Seconds -18Db Loop.

Description: Technology Test Tone Square Wave 500Hz 60 Seconds 0Db Loop.

Description: Technology Test Tone Square Wave 50Hz 60 Seconds -18Db Loop.

Description: Technology Test Tone Square Wave 62.5Hz 60 Seconds -18Db Loop.

Description: Technology Test Tone Square Wave 62.5Hz 60 Seconds 0Db Loop.

Description: Technology Test Tone Square Wave 8Khz 60 Seconds -18Db Loop.

Description: Technology Test Tone Square Wave 8Khz 60 Seconds 0Db Loop.

Description: Technology Test Tone Oscillating Log Sweep Square Wave Descend 20Khz Through 20Hz 60 Seconds 0Db.