Definitive Technology Mythos XTR-40 Ultra-Slim On-Wall Loudspeaker


Ultra-Slim On-Wall Loudspeaker

  • 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


Priced Individually



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.

Key Features

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.


Included Accessories
(1) Removable Base
(4) Carpet Spikes
(4) Hard Floor Glides

Floor Standing Speaker

Qty Included

23.25″ (59.06 cm)

6″ (15.24 cm)

1.5″ (3.81 cm)

5.1 lbs (2.31 kg)


On-Wall Mount

Mounting Type
1/4″ 20 Threaded Insert

Driver Complement
(1) 1″ (2.54 cm) d (Round) Tweeter – Pure Aluminum Dome
(2) 3.5″ (8.89 cm) d (Round) Mid/Woofer – XTDD Anodized Aluminum Mid/Bass Dome Driver
(2) 3.5″ (8.89 cm) d (Round) Bass Radiator – Anodized Aluminum Domed Bass Radiator

On-Shelf Mount

Mounting Type
1/4″ 20 Threaded Insert

Audio Quality

Total Frequency Response
100 Hz → 30 kHz

Max Sensitivity (1 watt @ 1 meter)
92 dB


A/V Receiver Crossover Setting

A/V Receiver Crossover Settings
Array: Small (100 Hz)
Array: Small (120 Hz)


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