Klipsch KL-6504-THX — Four Woofers, Floorstander-Level Output, No Floor Space
What makes the Klipsch KL-6504-THX distinct in this architectural lineup is its quad-woofer array — four 5.25" fiberglass woofers working together to deliver music and home theater performance closer to a high-end floorstanding tower than a typical in-wall speaker, sized specifically to sit behind 42-inch and larger flat-panel TVs.
An Important Certification Note
This model is catalogued in Klipsch’s “THX Ultra2” architectural product family, but its actual certification is THX® Select2 — the KL-6504-THX was one of the first THX Select2-certified in-wall speakers Klipsch produced. Select2 targets mid-sized rooms rather than the larger spaces Ultra2 is rated for, so it’s worth confirming which certification tier actually fits your room during a design consultation.
Horn-Loaded for Efficiency, Flexible Orientation
A 1" titanium tweeter mated to a symmetrical 90° x 90° square Tractrix® horn delivers flat in-room response with high efficiency and low distortion, and because the horn pattern is symmetrical, the KL-6504-THX performs consistently whether it’s mounted horizontally above a TV or vertically along a wall.
Let’s Design Your Ottawa Flat-Panel Audio Setup
Speakers like the KL-6504-THX are typically specified around a specific TV size and wall cavity, so I’d invite you to book a design and installation consultation with our Ottawa team before any walls are opened up.
Product Highlights
- Four 5.25" high-output fiberglass cone woofers
- 1" titanium tweeter in a 4" 90° x 90° horn
- Crossover frequencies: 250Hz and 2,100Hz
- Frequency response: 46Hz–20kHz (±3dB)
- Sensitivity: 92 dB
- Power handling: 150W continuous / 600W peak
- Impedance: 8 ohms compatible
- Mounts horizontally or vertically
- Dimensions: 28.5"H x 8"W; mounting depth 3.75"
- Cutout dimensions: approximately 27.25" x 6.5"
- Weight: 18.3 lbs.
- Paintable grille; sure-grip mounting dogs
- THX® Select2 certified
What's in the Box
- 1 in-wall loudspeaker
- Paintable grille
- Cutout template
- Mounting hardware (sure-grip dogs)
- Owner's manual
Frequently Asked Questions
Is the KL-6504-THX THX Ultra2 or THX Select2 certified?
Its actual certification is THX® Select2, even though it’s grouped with Klipsch’s THX Ultra2 architectural family in our catalog. We’re happy to explain the practical difference during a consultation.
What TV size is the KL-6504-THX designed for?
It’s sized to sit behind 42-inch and larger flat-panel TVs, with a tall, narrow footprint built to hide behind the display.
