PG contributor Tom Butwin demos seven direct boxes — active and passive — showing off sound samples, features, and real-world advice. Options from Radial, Rupert Neve Designs, Telefunken, Hosa, Grace Design, and Palmer offer solutions for any input, setting, and budget.
Grace Design m303 Active Truly Isolated Direct Box
The Grace Design m303 is an active, fully isolated DI box, delivering gorgeous audio performance for the stage and studio. Our advanced power supply design provides unbeatable headroom and dynamic range, while the premium Lundahl transformer delivers amazing low-end clarity and high frequency detail. True elegance, built to last.
Rupert Neve Designs RNDI-M Active Transformer Direct Interface
Compact design, giant tone. The RNDI-M brings the stunning tone & clarity of its award-winning counterparts to an even more compact and pedalboard-friendly format, with the exact same custom Rupert Neve Designs transformers and discrete FET input stage as the best-selling RNDI, RNDI-S and RNDI-8.
Telefunken TDA-1 1-channel Active Instrument Direct Box
The TDA-1 phantom powered direct box uses high-quality components and classic circuitry for rich, natural sound. With discrete Class-A FET, a European-made transformer, and a rugged metal enclosure, it delivers low distortion and a broad frequency response. Assembled and tested in Connecticut, USA, for reliable performance and superior sound.
Hosa SideKick Active Direct Box
The Hosa SideKick DIB-445 Active DI delivers clear, strong signals for live and studio use. Ideal for guitars, basses, and keyboards, it minimizes interference over long runs. Features include a pad switch, ground lift, and polarity flip. With a flat frequency response and low noise, it ensures pristine audio.
Radial JDI Jensen-equipped 1-channel Passive Instrument Direct Box
The Radial JDI preserves your instrument’s natural tone with absolute clarity and zero distortion. Its Jensen transformer delivers warm, vintage sound, while its passive design eliminates hum and buzz. With a ruler-flat response (10Hz–40kHz) and no phase shift, the JDI ensures pristine sound in any setup.
Radial J48 1-channel Active 48v Direct Box
The Radial J48 delivers exceptional clarity and dynamic range, making it the go-to active DI for professionals. Its 48V phantom-powered design ensures clean, powerful signal handling without distortion. With high headroom, low noise, and innovative power optimization, the J48 captures your instrument’s true tone—perfect for studio and stage.
Palmer River Series - Ilm
The Palmer ilm, an upgraded version of the legendary Palmer The Junction, delivers studio-quality, consistent guitar tones anywhere. This passive DI box features three analog speaker simulations, ensuring authentic sound reproduction. Its advanced filter switching mimics real guitar speaker behavior, making it perfect for stage, home, or studio recording sessions.
