Passive Direct Box w/ Ground Lift-Attenuator Switch DI

The SA-DI1 is a passive direct box that handles the signal matching problems every gigging musician faces when connecting instruments to mixing boards. This steel-bodied DI converts your unbalanced guitar, bass, or keyboard signal into a balanced 600-ohm XLR output that travels cleanly through long cable runs to the mixer without picking up noise or losing signal strength.

The three-position attenuator switch (0dB, -20dB, -40dB) lets you dial in the right output level for your mixer's inputs. If you're running active pickups, hot humbuckers, or keyboards with strong line outputs, you can knock down the signal to prevent that ugly input overload distortion. The parallel output jack means you can feed your stage amp simultaneously — standard practice for live gigs where you need both your backline and the house system.

The switchable ground lift eliminates that annoying hum you get from ground loops when your amp and the PA system are on different electrical circuits. At 4.75" x 3" x 1.75", this DI fits easily in your gig bag or cable case, and the solid steel construction will survive the load-ins and breakdowns.

This isn't a high-end transformer DI — it's a passive box that gets the job done reliably for club gigs, church services, and small venue shows. You won't get the coloration or isolation of a premium Jensen transformer box, but you'll get clean signal conversion at a price that won't hurt if it walks away from a festival gig.

**Bottom line:** The SA-DI1 is a straightforward passive DI that solves basic signal matching problems for guitarists, bassists, and keyboardists who need reliable connection between instruments and mixing boards.

Technical Specifications

• Attenuator Switch: 0dB, -20dB, -40dB
• Instrument Input: 50K unbalanced TS jack
• Parallel Output: 50K unbalanced TS jack
• Balanced Output: 600 ohm balanced XLR jack
• Ground Lift: Switchable
• Construction: Solid steel
• Dimensions: 4.75" x 3" x 1.75"
• Warranty: One year
• Recommended For: Guitar, bass, keyboard, DJ mixer connections

Frequently Asked Questions

What's the difference between the three attenuator settings?

The 0dB setting passes your signal unchanged, -20dB reduces it by 20 decibels for moderately hot signals, and -40dB provides maximum attenuation for very strong outputs like active pickups or line-level sources. Start with 0dB and switch to higher attenuation if your mixer's input overloads or distorts.

Can I use my amp and send to the mixer at the same time?

Yes, the parallel output jack lets you connect to your amplifier while simultaneously sending signal to the mixer through the XLR output. This is standard practice for live performance where you want both your stage sound and the house PA system fed from your instrument.

When should I use the ground lift switch?

Engage the ground lift if you hear hum or buzz when the DI box is connected. This commonly occurs when your amplifier and the PA system have different ground potentials, creating a ground loop. The ground lift breaks this loop while maintaining signal integrity.

Will this work with active pickups and high-output instruments?

Yes, the SA-DI1 handles high-output sources through its attenuator switch. Active pickups, hot humbuckers, and line-level keyboards can all be accommodated by selecting the appropriate attenuation level (-20dB or -40dB) to prevent mixer input overload.