OX Amp Top Box Critical Operation Notes 7
Critical Operation Notes
Caution: Connecting and/or operating OX incorrectly can cause permanent
damage to your amplifier, OX, and/or other equipment connected to OX.
Universal Audio is not responsible for equipment damage resulting from
improper OX connections and/or operations. Review the important information
in this chapter before connecting or using OX!
Critical Notes — Avoid Equipment Damage
Amp Output Load
DON’T operate any tube amp without an output load such as a guitar speaker or OX. Using a
tube amp without an output load can permanently damage the tube amp.
Caution: Always POWER OFF the tube amp before connecting or disconnecting its
speaker output to guitar speakers or OX.
OX’s Red FROM AMPLIFIER Input Jack
DON’T connect the tube amp’s high-power speaker output to ANYTHING other than OX’s FROM
AMPLIFIER input jack. The nut on this jack is RED to indicate this input is ONLY for the tube
amp’s speaker output.
OX’s TO SPEAKER Output Jack
DON’T connect OX’s high-power TO SPEAKER output jack to ANYTHING other than a guitar
speaker cabinet to avoid equipment damage to other gear.
Amp Power Rating
DON’T use OX with amplifiers exceeding 150 Watts RMS output power. Any tube amp with an
output power rating of 150 Watts RMS or less can be safely used with OX.
Speaker Cable Insertions
DON’T partially insert ¼” speaker cable plugs halfway into the jack or only to the first click. The
cable from the amp’s speaker output must be fully inserted into OX’s red FROM AMPLIFIER
jack to connect the ground return for proper amp loading.
Speaker Cables
Use only high-quality 12 to 16 gauge unshielded ¼” mono TS (tip-sleeve) speaker cables for
OX’s high-power FROM AMPLIFIER and TO SPEAKER connections. “Speaker” is usually printed
on these cables.
Tip: As a general guideline, the longer a speaker cable is, the smaller its cable gauge
needs to be (smaller gauge = bigger wires).
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