Bass amplifier
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A bass amplifier is a musical instrument electronic device that uses electrical power to make lower-pitched instruments such as the bass guitar or double bass loud enough to be heard by the performers
An Ampeg SVT cabinet with eight 10" speakers, with a separate Ampeg SVT amplifier "head" on top.
A Yamaha B100-115 combo amp, which contains a 100 watt amplifier and one 15" speaker in a wooden cabinet.
A Hartke 500 watt amp "head" on top of an Ashdown 4x10" speaker cabinet.
A 1930s era combo amplifier and a Rickenbacker electric upright bass from 1935.
DI unit
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A DI unit is an electronic device typically used in recording studios and in sound reinforcement systems to connect a high output impedance unbalanced output signal to a low-impedance, microphone leve
A professional passive DI box. It is passive because it does not need external power to operate. DI boxes which require a power source (batteries or phantom power) are called active DI boxes.
A vintage Wolfbox custom-made by audio engineer Ed Wolfrum in the 1960s.
A passive DI with "throughput" in addition to XLR output
An active stereo DI with pass-through in mono mode only