Samson S-Max MD1 - Passive Mono DI Box with STL Transformer and Ground Lift

Samson S-Max MD1 - Passive Mono DI Box with STL Transformer and Ground Lift

The Samson S-Max MD1 is a passive mono DI box designed to convert unbalanced instrument or line signals to a balanced, low-impedance XLR output , maintaining audio integrity over long cable runs without noise. It incorporates the Samson STL transformer , which offers a flat response of 18 Hz to 40 kHz and low distortion , as well as a Ground Lift switch to eliminate ground loops. Its IN + THRU connectivity via 6.35 mm jack allows the signal to be sent in parallel to an amplifier/monitor and the mixing console simultaneously. Constructed from 14-gauge steel , the MD1 can withstand intensive touring use and does not require power (neither phantom nor batteries).

Main features

• Passive mono DI for guitar, bass, keyboards, electronic drums and line players.
• Samson STL transformer with 18 Hz–40 kHz response and THD <0.03% (20 Hz–40 kHz).
• Ground Lift to break ground loops and reduce hum.
• IN and THRU on 6.35 mm jack (parallel) + balanced XLR output .
• Max. input level +20 dBu (0.35% THD) and >100 dB dynamic range.
• 14 gauge steel chassis , impact resistant.
• No power : 100% passive operation, no phantom power or batteries.

Product benefits

• Clean, consistent audio : Convert to low-impedance balanced for long cable runs with reduced susceptibility to noise.
• Easy integration : THRU allows you to keep your amp on stage while delivering a balanced signal to your mixer or interface.
• Noise Control : STL transformer and Ground Lift help eliminate hum and RF interference.
• Touring reliability : Rugged metal construction for rental, schools and everyday professional use.

Use cases

• Direct : Connect guitars, basses or keyboards to PA/monitors with minimal noise.
• Studio : Clean captures and re-amping with stable balanced output.
• Facilities : auditoriums, churches or educational centers with long runs and multiple users.

Frequently Asked Questions

• Does it need power? No. It's passive and doesn't require a phantom power supply or batteries.
• Can I use the THRU output for my amp? Yes. The THRU replicates the input to feed an amp or monitor in parallel to the XLR output.
• Can it handle line levels? Yes. It accepts both instrument and line signals; the passive transformer design handles high levels with low distortion.

Description for projects

Passive mono DI box with Samson STL transformer . Inputs : 1× 6.35 mm jack (IN, unbalanced) + 1× 6.35 mm jack (THRU in parallel). Output : 1× balanced XLR. Functions : Ground Lift . Specifications : response 18 Hz–40 kHz ±0.1 dB ; max. input +20 dBu (0.35 % THD); dynamic range >100 dB ; noise −117 dB ; THD <0.03 % (20 Hz–40 kHz); input impedance 400 kΩ ; output impedance 250 Ω ±20 % ; transformer ratio 15:1 ; 14-gauge steel chassis ; dimensions 127 × 86 × 49.6 mm ; weight 0.68 kg . No power supply required.