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Definitive Technology® Mythos XTR Series Black Ultra-Slim On-Wall Speaker

Model #: Mythos XTR-40
Definitive Technology
At a Glance

Mythos XTR-40 on-wall or on-shelf-mounting ultra-thin loudspeaker. 1 - 1” XTDD aluminum dome tweeters, 2 - 3.5” bass/mid drivers, 2 - 3.5” bass radiators.

$499.00Save $152.00

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Get to know this product.

Hand-polished aircraft-grade aluminum is used almost exclusively in XTR speakers because few materials are rigid and resonance-free enough to perform well in compact sizes. With a patented XTDD anodized aluminum dome driver and pure aluminum dome tweeter—the same found in larger XTR speakers—the XTR 40 offers an incredibly broad sound experiences with a sleek, modern profile design to match.

  • Anodized aluminum XTDD drivers for ultra-high performance in a small space
  • Aircraft-grade aluminum enclosure means total rigidity that’s resonance-free
  • Compact 1.5" depth puts high performance sound quality anywhere it’s needed
  • Uncompromising sound quality equivalent to speakers twice its size

Optimized for High End Sound

The extraordinary patented XTDD technology dome drivers are what give the XTR-40 its ultra-high performance, dynamic punch, wide frequency range and broad dispersion.

TV Speakers Don't Hold a Candle

As TVs get thinner and their speakers get smaller, the XTR-40 brings theater quality sound back to your flat screen experience.

Better Experiences Built In

Robust sound and wide ranging clarity from such a small speaker is the result of our forward-thinking approach to sound—the kind we engineer into every one of our products

Performance Comes Naturally

When you create a small speaker with the same drivers, radiators and tweeters you use in larger versions, even small size can deliver huge, natural, lifelike audio.

Useful Documents


Qty Included1

Driver Complement

Tweeter - Tweeter(1) 1" (2.54 cm) d (Round) Tweeter
Mid/Woofer - Tweeter(2) 3.5" (8.89 cm) d (Round) Mid/Woofer
Tweeter/Mid Array - Tweeter(1) 0" (0 cm) h x 0" (0 cm) w (Oval) Tweeter/Mid Array
Bass Radiator - Tweeter(2) 3.5" (8.89 cm) d (Round) Bass Radiator

On-Wall Mount

Mounting Type1/4" 20 Threaded Insert

On-Shelf Mount

Mounting Type1/4" 20 Threaded Insert


Speaker Inputs(1) Pair of Proprietary Connector Block - na

Audio Quality

Total Frequency Response100 Hz to 30 Hz
Nominal Impedance8 ohms
Max Sensitivity (1 watt @ 1 meter)92 dB


TypeA/V Receiver Crossover Setting
A/V Receiver Crossover SettingsOn Wall: Small (100 Hz) On Shelf: Small (120 Hz)


Cabinet Warranty5 Years
Drivers Warranty5 Years

Shipping Cartons

Carton11.25" (28.58 cm) h x 27.5" (69.85 cm) w x 5.25" (13.34 cm) d - 8.5 lbs (3.86 kg)

Included Accessories

Horizontal Level Adapter2
Horizontal Leveler Foot2

Misc. Specs

Product Weight (lbs.)5.1
Impedance8 ohms
Number of Speakers1
Speaker TypeOn-Wall Speakers
Depth (in.)1.5
Height (in.)23.25
Width (in.)6
WarningProposition 65 Warning for California Residents