PreSonus Eris E44 and E66 MTM Monitors Provide Ultra-Wide Imaging PreSonus' new Eris E44 and E66 two-way active MTM studio monitors deliver an expanded frequency range, thanks to their nested Midwoofer-Tweeter-Midwoofer (MTM, also known as "D'Appolito") design. The result is a more consistent listening experience on- and off-axis, the company says. The E44 and E66 nested MTM configuration incorporates dual Kevlar low/mid drivers (4.5"- and 6.5", respectively) operating in parallel and covering the same frequency range so that they acoustically couple. This effectively creates a larger woofer to provide a more dynamic output than conventional two-way studio monitors. Nesting a 1.25", silk-dome, high-frequency driver between the two woofers minimizes phase displacement to improved spatial resolution and a wide sweet spot. Like all Eris speakers, the E44 and E66 provide the tools and flexibility needed to suit any mixing environment. By bringing the midrange drivers close together and raising the HF driver, the E44 and E66 are able to perform in both horizontal and vertical orientations. A three-position Acoustic Space switch helps compensate for the boundary bass boost that occurs when the monitor is placed near a wall or corner. High and Mid acoustic tuning controls further help to mitigate room problems. A Low Cutoff filter makes it easy to integrate a subwoofer, the company says. Individual balanced XLR and ΒΌ" TRS and unbalanced RCA input connections make hookup quick and easy. Safety features include RF shielding, current-output limiting, over-temperature protection, and subsonic protection. The Eris E44 and E66 and the new R65 and R80 AMT monitors are welcome additions to the PreSonus range of studio monitors. The line also includes the Ceres C3.5BT and C4.5BT, which feature Bluetooth wireless and consumer-oriented I/O; the Eris E4.5, E5, and E8, which deliver pro quality for personal studios; the Sceptre S6 and S8 coaxial monitors, with best-in-class Z-plane imaging; and the Temblor T8 and T10 active studio subwoofers. 
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