Atlantic Technology IWTS-155LCR THX In-Wall Speaker – (Each)



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The IWTS-155 LCR  is a premium-performance in-wall speaker that addresses the need for no-compromise performance with the flexibility to mount either horizontally or vertically in standard 16″-on-center stud-framed walls. It is a perfect solution for retro-fit applications and its small footprint makes it particularly inconspicuous when installed.

*The GFR-155 grille/frame assembly (required) is packaged and sold separately for maximum installation/scheduling flexibility

SKU: iwts155lcr Categories: ,


The 155’s MDF baffle continues Atlantic’s use of non-resonant baffle material for in-wall speakers, resulting in far better acoustic performance than speakers that use ‘ringy’ plastic or resonance-prone aluminum baffles or enclosures.

As a final touch, the 155 has two easily-accessible controls on the front panel (Boundary Compensation and HF Level) to adjust for varying placement and room acoustics situations.

The required GFR-155 grille/frame assembly is packaged and sold separately, so the grilles can be installed and painted during the construction phase, and the speakers themselves can be installed later on.

  • Sonic performance is a perfect match with our other Atlantic THX in-walls
  • Easy horizontal mounting between standard 16″-on-center, 3 1/2″-deep wall construction
  • Backbox (IN-BOX-155) sold separately, required for THX-certified performance
  • Boundary Compensation and High Frequency sound-optimization controls


Dual 5 1/4″ (135mm) GLH* long throw woofers w/Butyl rubber surrounds and high power motors, 1′ (25mm) Low Resonance Tweeter w/Neodymium magnet and Ferrofluid cooling


High Frequency Level
Boundary (Near wall/corner or mid-wall)

Frequency Response
58Hz – 20kHz +/-3dB

89dB, 1 watt, 1 meter

6 Ohms

Crossover frequencies

Recommended amplifier power
10 – 150 Watts RMS

Optimum wall volume
.5 cu.ft.

Overall Dimensions (W x H x D)
15 1/2x 8 1/2 x 3 3/4″ (395 x 216 x 97mm)

Cutout dimensions (W x H)
14 1/4 x 7 1/8″ (362 x 181mm)

New Construction Bracket (optional)
IN-NC-155 (use only if IN-BOX-155 is not being used)

Back Box (optional, but req’d for THX certification)
IN-BOX 155 LCR for new construction

8 lbs. (3.6kg)

Additional information

Weight 16 lbs


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