The SA-DI1 passive direct boxes solve the universal problem of connecting unbalanced instruments and DJ gear to professional mixing consoles and PA systems. Musicians, DJs, and sound engineers rely on these units to eliminate ground loop hum and match signal levels between different pieces of equipment.

Each DI box converts high-impedance unbalanced signals from guitars, keyboards, and DJ mixers into low-impedance balanced XLR outputs that mixers prefer. The three-position attenuator switch (0dB, -20dB, -40dB) handles everything from sensitive instrument pickups to hot DJ mixer outputs without overloading your console inputs.

The 50K ohm unbalanced TS input accepts standard instrument cables, while the parallel output lets you send signal to both an amplifier and mixer simultaneously. The 600-ohm balanced XLR output provides clean signal transmission over long cable runs. Ground lift switching eliminates hum caused by ground loops between different pieces of equipment.

These boxes work in any live sound scenario: church worship bands connecting keyboards and guitars to the house system, DJs interfacing consumer mixers with venue sound systems, or bands running direct signals to monitors and front-of-house simultaneously. The solid steel construction handles the rigors of mobile setups and permanent installations alike.

Connect instruments via standard TS cables, run balanced XLR cables to your mixer, and engage the ground lift if you hear hum. Each pair ships ready to solve your signal matching challenges with Seismic Audio's one-year warranty and direct manufacturer support.

Technical Specifications

Frequently Asked Questions

What's the difference between the three attenuator settings?

The 0dB setting passes signal without attenuation for most instruments like guitars and basses. The -20dB setting works well for keyboards and active pickups that output hotter signals. The -40dB setting handles line-level sources like DJ mixer outputs or amp speaker outputs, preventing overload of your mixing console inputs.

Do I need powered or passive DI boxes for my setup?

Passive DI boxes like the SA-DI1 work perfectly for most instruments and line-level sources since they don't require phantom power or batteries. They're ideal for guitars, keyboards, DJ mixers, and any source with sufficient output level. You'd only need active DI boxes for very low-output sources like ribbon microphones or some acoustic pickups.

Can I use these to connect my DJ mixer to a venue's sound system?

Yes, this is one of the most common applications. Connect your DJ mixer's main outputs to the DI box inputs using TS cables, then run balanced XLR cables from the DI outputs to the venue's mixing console. Use the -20dB or -40dB setting depending on your mixer's output level to prevent overloading the house system.

What cables do I need to use these DI boxes?

You'll need standard TS instrument cables to connect your sources to the DI box inputs, and balanced XLR cables to connect the DI outputs to your mixer or interface. The parallel outputs use TS connections if you want to send signal to an amplifier simultaneously. All cables are standard and widely available.

Will these eliminate the hum I'm getting from my keyboard rig?

The switchable ground lift feature specifically addresses ground loop hum, which is the most common cause of unwanted noise when connecting multiple pieces of equipment. If the hum persists with ground lift engaged, the issue may be elsewhere in your signal chain, but these DI boxes solve the vast majority of ground loop problems in live sound and studio applications.

WARNING: This product can expose you to chemicals including Di(2-ethylhexyl)phthalate (DEHP), which is known to the State of California to cause cancer. For more information, go to: www.P65Warnings.ca.gov