Monolith™ by Monoprice™M‑OW1 THX® Certified On‑Wall SpeakersMonolith™ M‑OW1 THX® Certified On‑Wall Speakers offer high performance audio from a slim cabinet and compact, powerful drivers. Featuring a powerful 4.5' concentric driver and dual 4.5' passive radiators, Monolith OW1 On‑Wall Speakers have relatively flat frequency response from 70Hz ~ 20kHz and can be used as the front, center, or surround channel speakers. They have been THX® Certified to ensure spectacular home theater performance in just about any room. Add a THX® Certified Monolith subwoofer and you have the ultimate in audio performance!70Hz ~ 20kHz frequency responseSlim MDF cabinet4.5' concentric driverTwo 4.5' passive drivers20mm silk dome tweeter84.4dB sensitivity4 ohms nominal impedance5‑way spring‑loaded binding postsKeyhole slot on rear for easy wall mounting For almost 40 years, THX has set the standard for the audio and visual fidelity of entertainment experiences. THX® Certification is a globally recognized assurance of uncompromising quality, consistency and performance. We blend art, technology, and the dynamics of real world listening and viewing environments to ensure products deliver the artist's true vision.THX® CertificationUsing industry standards and a proprietary testing methodology, THX engineers evaluate and certify the audio and visual fidelity of consumer electronics to ensure they deliver the optimal entertainment experience. In cinemas, at home, and on‑the‑go, your entertainment comes alive with THX.Certification ProcessWhat We TestTHX engineers perform hundreds of audio and video performance and quality assurance tests before a product is confirmed to be THX® Certified.AUDIO: We analyze everything from output levels, frequency response, signal‑to‑noise, distortion and bass management to recreate high impact cinema sound and best‑in‑class audio fidelity.VIDEO: We test color accuracy, panel performance, and video processing, to confirm a display delivers accurate images and pristine video performance in every frame.Why Certification MattersThe THX® Certified benchmark offers consumers the assurance of superior audio or visual performance from consumer electronics.THX offers the industry's most rigorous testing processTHX guarantees high performance and premium build quality CONCENTRIC DRIVERSThe Monolith™ OW1 uses a single 4.5' concentric driver with an inset 20mm tweeter. The polypropylene cone has a thick NBR surround, while the silk dome tweeter is equipped with a waveguide and neodymium.