Presonus Eris E44 - BIAMPLIFIED STUDIO MONITOR 2x 4.5 "/ 1.25" 85W

(This text is machine translated) The Eris E44 and E66 offer highly accurate extended frequency response and the widest stereo sound field available in their range. Their nested Midwoofer-Tweeter-Midwoofer (MTM, also known as "D'Appolito") configuration offers off-axis response and improved spatial resolution. Conventional 2-way designs can cause noticeable early reflections from their surroundings. The E44s overcome this by placing a 1.25 ", silk dome high frequency driver between two 4.5" (E44) midrange drivers. The two small woofers work in parallel to partially contain the dispersion of the tweeter, minimizing the phase shift. The result is an incredibly detailed stereo image. Both the E44 and E66 feature two midrange drivers that cover the same frequency range. Drivers are placed so that their acoustic centers are less than one wavelength for each of the frequencies they reproduce; as a result, the combined signal from both drivers propagates forward as a single waveform.