The Klipsch THX-504-L In-Wall Speaker delivers high-output cinema performance from a slim architectural loudspeaker designed to disappear into the room. THX Select Certified and engineered for serious home theater installations, the THX-504-L combines four 5.25-inch high-output fiberglass-cone woofers with a horn-loaded 1-inch titanium-diaphragm compression driver for powerful dynamics, clear dialogue, controlled dispersion, and impressive output without occupying valuable floor space.
Its long, narrow configuration makes the THX-504-L particularly versatile when designing a concealed front soundstage. The speaker can be installed vertically or horizontally, allowing it to serve in left-, center-, or right-channel applications depending on the theater layout. A symmetrical 90° × 90° square Tractrix horn helps maintain consistent coverage in either orientation, while its infinite-baffle design and shallow mounting depth simplify integration into walls where a conventional cabinet loudspeaker would be impractical.
Key Features & Innovations
THX Select Certified performance — the Klipsch THX-504-L In-Wall Speaker is engineered to deliver high-output cinema performance from a discreet architectural design while meeting demanding THX Select performance requirements.
Four 5.25-inch fiberglass-cone woofers — the vertically arranged high-output woofers provide substantial radiating area for powerful bass and midrange reproduction while allowing the speaker to maintain its narrow in-wall profile.
1-inch titanium-diaphragm compression driver — Klipsch uses a compression-driver architecture for high efficiency, low distortion, and the dynamic capability required for demanding movie soundtracks.
90° × 90° square Tractrix horn — the symmetrical horn provides controlled high-frequency dispersion while allowing the speaker to maintain consistent coverage when installed either vertically or horizontally.
46Hz–20kHz frequency response — substantial low-frequency extension gives the THX-504-L impressive bandwidth for an architectural loudspeaker while allowing seamless integration with a dedicated theater subwoofer system.
92dB sensitivity — efficient driver and horn technology allows the THX-504-L to achieve substantial output while making effective use of available amplifier power.
150W continuous / 600W peak power handling — substantial power capability makes the speaker suitable for demanding home cinema systems using high-performance AV receivers or separate multichannel power amplifiers.
Vertical or horizontal installation — the THX-504-L maintains its intended performance in either orientation, providing useful flexibility for left-, center-, right-, or other direct-radiating speaker positions.
Infinite-baffle design — the speaker is engineered to use the wall cavity as part of its installation rather than requiring a large integrated enclosure, contributing to its shallow 3.52-inch mounting depth.
MDF and aluminum motorboard construction — the driver assembly combines MDF construction with an aluminum motorboard and ABS frame to create a rigid foundation for the speaker's high-output drivers.
Sure-grip mounting system — integrated mounting dogs apply even pressure against the drywall, providing a secure architectural installation designed for long-term reliability.
Edge-to-edge magnetic grille — the flat paintable grille uses premium neodymium magnets for easy installation and removal while helping the finished speaker visually disappear into the wall.
Timbre-matched THX speaker family — the THX-504-L is designed to integrate with Klipsch's other THX-certified architectural speakers for consistent sonic character throughout a concealed theater system.
FAQ — Klipsch THX-504-L
Is the THX-504-L THX Ultra2 Certified?
No. The THX-504-L is THX Select Certified. It is designed to provide high-performance cinema sound from a more compact architectural format while integrating with other Klipsch THX-certified speakers.
Can the THX-504-L be used as a center-channel speaker?
Yes. The THX-504-L can be installed horizontally or vertically, making it suitable for center-channel applications as well as left- and right-channel duties. Its symmetrical 90° × 90° Tractrix horn helps maintain consistent coverage regardless of orientation.
How is the THX-504-L different from the THX-8000-L?
The THX-504-L uses four 5.25-inch fiberglass-cone woofers and a 1-inch titanium compression driver with a 90° × 90° Tractrix horn. The larger THX-8000-L uses an 8-inch aluminum woofer and an 80° × 80° horn and carries THX Ultra2 certification. The THX-504-L provides a narrower architectural footprint and greater placement flexibility where wall space is limited.
How much amplifier power can the THX-504-L handle?
The THX-504-L is rated for 150 watts continuous and 600 watts peak, with Klipsch specifying 150 watts as the recommended amplifier power. Its 92dB sensitivity also allows it to produce substantial output efficiently.
Does the THX-504-L need a subwoofer?
A dedicated subwoofer is recommended for a complete home theater system. Although the THX-504-L extends down to a specified 46Hz, routing deep bass and low-frequency effects to a properly configured subwoofer system provides greater headroom and allows the in-wall speaker to concentrate on the rest of the soundtrack.
Can the THX-504-L be installed horizontally?
Yes. Klipsch specifically designed the THX-504-L to deliver its intended performance when installed either horizontally or vertically. This makes it especially useful when configuring a concealed center channel above or below a display.
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