Direct Box suits audio equipment with 3-pin XLR inputs.

Press Release Summary:

Model SC800 Instrument Direct Box converts outputs of high-impedance line level audio devices to low-impedance, balanced, and isolated mic level signals. Product offers common mode rejection of greater than 100 dB at 60 Hz as well as input impedance of greater than 150 kW at 1 kHz and output impedance under 170 W at 1 kHz. Total harmonic distortion plus noise is less than .05% at 20 Hz, +4 dBu and under .006% at 1 kHz, +4 dBu. Frequency response is 10 Hz to 40 kHz ± 0.3 dB.

Original Press Release:

New SC800 Instrument Direct Box

The SC800 Instrument Direct Box from Switchcraft® converts the outputs of high impedance line level audio devices and musical instruments to low impedance, balanced and isolated mic level signals that can be connected to audio console's, mic pre's, effects processors, and other equipment with 3-Pin XLR inputs.

The SC800 was developed with one goal in mind... to provide audio engineers and musicians with the highest quality passive direct box available today.

Built by hand in Chicago, USA.

SC800 Technical Specifications:

All measurements were taken with a 25 W source into a 1 kW load measured on XLR output.

Common Mode Rejection

Greater than 100dB at 60Hz

Input Impedance

Greater than 150 kW at 1kHz

Output Impedance

Less than 170 W at 1kHz

Phase Response

Less than 3° at 20Hz

Less than 1° at 1kHz

Less than 16° at 20kHz

Total Harmonic Distortion + Noise

Less than .05% (At 20Hz, +4dBu)

Less than .006% (At 1kHz, +4dBu)

Maximum Input Level

+21dBu (At 20Hz with 1% THD)

+41dBu (With 20dB Pad Engaged)

Frequency Response

10Hz to 40kHz (+/-0.3dB, ref 1kHz)

Voltage Gain


-43dB (With 20dB Pad Engaged)


All Topics

COVID-19 Response Suppliers COVID-19 Response:
Can Your Company Help Provide Critical Supplies?

We are using the power of our platform to aid in the mass shortage of critical supplies. If your company can help provide supplies, capabilities, or materials for products such as N-95 Masks and Tyvek SuitsPlease let us know.

COVID-19 Response Suppliers