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Sierra-2EX Intro
Photo Gallery

*All measurements taken using DRA Lab’s MLSSA system with RCAI, calibrated ACO Pacific 7012 ½” free field measurement microphone with associated pre-amp and power supply and an automated Outline turntable.

Full-range quasi-anechoic on-axis frequency response

Microphone distance is 1 meter with calibrated sensitivity

Sierra-2EX Frequency Response Graph

Horizontal and vertical off-axis graphs plus listening window

Listening window is the averaged response of 9 separate measurements, on-axis, +/- 10 degrees horizontal, +/- 20 degrees horizontal, +/- 30 degrees horizontal and +/- 10 degrees vertical. Note: due to the measurement technique, the response below 250Hz is invalid, as represented by the above and below horizontal green bars.

Sierra-2EX Off-Axis Graph

Polar Response

5 degree increments from 0 degs to a full 90 degs off-axis. Note how the critical midrange response remains linear and consistent with uniformly decreasing spl as frequency increases. This represents an exceptionally wide off-axis response.

Sierra-2EX Polar Response

Impedance and electrical phase

Note the extremely clean impedance response (free from wrinkles which would represent various forms of resonances) and linear phase with minimal phase angles. The mild phase angles ensure that this speaker is an easy load for even basic receivers.

Sierra-2EX Bode Graph

Energy Time Curve

This measurement is a good indication of overall transient accuracy and stored energy. The graph displays the decay time of a full range impulse. The impulse occurs at 3ms and decreases uniformly to the noise floor (-45db) by 4ms. This represents a decay time of 1ms, which is superb. Large diameter woofer cones, woofers and tweeters with poorly designed motor systems and/or heavy mass and poorly constructed cabinets will often contribute to far greater decay times which damage transient accuracy, coherency and overall resolution.

Sierra-2EX ETC Graph

Cumulative Spectral Decay

This measurement is similar to the energy time curve but displays a 3 dimensional view such that we can examine the decay time with reference to frequency. It is an exceptional tool to reveal transient accuracy and indicate various problem areas with respect to resonance and stored energy. The CSD of the Sierra-2EX is exceptionally clean with good uniformity.

Sierra-2EX CSD Graph

Spinorama Measurements

This is a complex suite of measurements developed by Dr. Floyd Toole during his time at Harman and is now defined by ANSI/CTA-2034A. As clearly indicated, the Sierra-2EX displays superb spin measurements.

Sierra-2EX Spin Graph