Universal Audio OX Operation Manual page 20

FROM AMPLIFIER Input (20)
Caution:
To avoid permanent damage to the amplifier and/or OX:
• POWER OFF the tube amp before connecting or disconnecting its speaker
output.
• DON'T power or operate any tube amp without an output load such as a
guitar speaker or OX.
• DON'T partially insert ¼" speaker cable plugs halfway or only to the first
click. DO fully insert all speaker cable plugs to ensure proper ground returns.
• DON'T use OX with amplifiers exceeding 150 Watts RMS output power.
This jack is OX's reactive load input. Connect a ¼" speaker cable between the tube
amp's speaker output and this
(soaked) by the reactive load then passed to OX's SPEAKER OUT jack.
Important:
Use only a high-quality 12 to 16 gauge unshielded ¼" mono TS
(tip-sleeve) speaker cable for the high power FROM AMPLIFIER connection.
"Speaker" is usually printed on these cables.
Note: When OX power is OFF, OX presents a 16 ohm load at the FROM
AMPLIFIER input to prevent tube amp damage that could occur with an unloaded
amp output.
OX Amp Top Box
RED input jack. The signal received here is attenuated
20 Controls & Connectors