The THX® In‑Wall Speaker Series has been engineered to deliver the highest level of accuracy and reproduce all the dynamics and details of the best home theater soundtracks and music. Each speaker has been THX® Certified Ultra, ensuring optimal frequency response, dispersion, and low distortion. THX Certification ensures that the sound from the speaker is as the audio engineer intended. The THX‑365IW features premium drivers, THX Certification, a sophisticated crossover network, and an HDF cabinet to ensure that you've never experienced home theater sound that is this dynamic, detailed, or immersive from an in‑wall speaker. THX® CERTIFIED ULTRATested. Approved. Certified.THX® Engineers complete hundreds of different scientifically formulated tests to ensure the highest audio standards possible. Key tests in this program are as follows:Axial Frequency ResponseThis describes a loudspeaker's ability to reproduce audio accurately. Our test confirms the axial frequency response is balanced and flat.Vertical and Horizontal DispersionNot everyone gets the middle seat when watching a movie. So we test the off‑axis response to make sure it is smooth with no audible comb filtering, making every seat in the room the sweet spot.Output Versus DistortionThis test ensures the speaker can reach the high volumes necessary to achieve THX® Reference Level without creating audible distortion or artifacts. PREMIUM DRIVERSHigh‑Excursion Woofers. Silk Dome Midrange. Silk Dome Tweeter.Featuring carefully selected drivers that deliver a flat frequency response in the listening window, the THX-LCR features two 6.5' woofers, a 2' silk dome midrange, and a 1' silk dome tweeter. The silk dome midrange operated in the 550Hz~1.9kHz range, improving power handling, lowering distortion, and improving the polar response, which allows the speaker to achieve higher SPL. The 6.5' high‑excursion woofers feature long fiber pulp cones, NBR surrounds, and are design with shorting rings to keep distortion at a minimum. The combined driver design enables each speaker to reach sonic heights and deliver accurate sound for the best in home theater dynamics and detail.PRECISION CROSSOVER NETWORKThe THX® speaker series feature carefully selected fourth‑order Linkwitz‑Riley crossover network acoustic filters. This sophisticated crossover minimizes sonic frequency overlap, reduces distortion, and is an excellent choice to minimize off‑axis response errors near the crossover frequency.EASY INSTALLThe heavy‑duty mounting tabs make for a fast and problem‑free installation. The magnetic, detachable grille is powder‑coa.