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Processors & Effects

20 products from 6 brands, including Radial, DBX, Rolls. Prices from $95.95 to $580.95, including GST.

Processors and effects shape, balance or route audio between instruments, mixers, interfaces and other studio or live sound equipment. This category suits musicians, recording engineers, podcasters and production teams choosing a direct injection box or audio processor. Browse options from Radial, Palmer, Rolls and Zoom for instrument, line-level, stereo and re-amping setups.

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About the Processors & Effects range

Start with the source and destination. Active D.I. boxes suit passive pickups and piezo instruments because their high input impedance helps retain signal detail. Passive D.I. boxes suit active instruments, keyboards and other stronger outputs, and do not need power. Check for a balanced XLR output, input pad, ground lift, polarity control and a thru connection for feeding an amplifier. Stereo models are useful for keyboards, laptops and playback devices. For effects and processors, compare input and output formats, channel count, signal level, power requirements and whether the unit is intended for recording or live use.

Connect a 6.35 mm instrument or line output to the D.I. input, then run a balanced XLR cable to a mixer, stage box or audio interface. Do not assume every D.I. is stereo. A mono model may combine or discard part of a stereo source, so use a stereo D.I. for laptops, keyboards and playback. Active models need 48 V phantom power or a battery, while passive models operate without power. Use ground lift only when required to reduce hum, and check the product specifications before connecting speaker-level outputs or re-amping equipment.

Processors & Effects questions

Do I need an active or passive D.I. box?

Choose an active D.I. for passive guitar, bass or piezo pickups, where high input impedance can preserve the source signal. Choose a passive D.I. for keyboards, active instruments and other stronger outputs. A passive model needs no battery or phantom power, while an active model requires one of those power sources.

Can I connect a laptop or keyboard to a D.I. box?

Yes, but check whether the source is stereo and choose a stereo D.I. when you need both left and right channels. Use the correct cable or adaptor from the device output, then connect the D.I.'s balanced XLR outputs to the mixer or interface. Avoid treating a mono D.I. as a stereo unit.

Will a D.I. box remove hum from my audio system?

A D.I. box can help reduce hum caused by ground loops, particularly when it includes a ground lift switch and transformer isolation. Connect the system normally first, then engage ground lift if required. It will not fix every noise source, including faulty cables, unsuitable power supplies or interference.

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