Rational Acoustics has just introduced the new Smaart I-O, a measurement-grade 2×2 USB audio interface designed and built specifically for use with Smaart v.7 measurement software. 

The I-O features two high-quality, active balanced inputs with 50 dB of computer adjustable gain in precision 1 dB steps. These input gains are monitored directly by Smaart allowing the user to retain accurate SPL calibration while varying measurement signal input levels.

The inputs employ a Neutrik combo jack (XLR – 1/4-inch) to accommodate both mic and line level input signals, each with switchable 48-volt phantom power on the XLR inputs for measurement mics and a 20 dB pad on the 1/4-inch to accommodate line level signals.

The Smaart I-O also features two active balanced XLR outputs capable of providing +8.2 dBu (2 Vrms) max level signal for playback or excitation sources.

Powered by the USB port of your computer (or via the optional 5 VDC jack), the Smaart I-O provides a compact and portable measurement-quality input for a Smaart rig.

Smaart I-O Features

Two (2) Neutrik XLR – 1/4-inch combo jack inputs
—Computer controllable 50 dB analog gain in precision 1 dB steps
—Max input (at minimum gain): +6 dBu (XLR),  +26 dBu (1/4-inch)
—Active balanced with 2k ohm impedance (XLR), 65k ohm (1/4-inch)
 
Two (2) Active Balanced XLR Outputs
—150 Ohm impedance
—Max Output : +8.2 dBu (2.0 V rms) w/ 100k ohm load
 
Frequency Response
—Magnitude :  16 Hz – 20 kHz, +/- .25 dB
—Phase:  16 Hz – 20 kHz, +/- 10 deg
 
Sample rate clocks of multiple I-O’s can be linked to allow for device aggregation in Smaart’s dual-channel measurements.
 
Bus powering via USB for convenient, single-cable connection to the computer.
 
Optional 5 VDC jack in cases of insufficient USB power
 
Dimensions:  1.75-in (h) x 7.25-in (w) x 4.25-in (d)

For more info about the new Smaart I-O, and to download the control application for Smaart v7, click here.

Rational Acoustics