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Atlantic Technology IWTS-155 LCR

In-wall Speakers

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  • Using In-wall Speakers



THX  Ultra2 Performance that fits everywhere!
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 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
  • The GFR-155 grille/frame assembly (required) is packaged and sold separately for maximum installation/scheduling flexibility


Woofers: Dual 5 1/4" (135mm) GLH* long throw woofers w/Butyl rubber surrounds and high power motors

Tweeter: 1' (25mm) Low Resonance Tweeter w/Neodymium magnet and Ferrofluid cooling

Configuration: 2-way

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

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

Sensitivity: 89dB, 1 watt, 1 meter

Impedance: 6 Ohms

Crossover frequencies: 2100Hz

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

Weight: 8 lbs. (3.6kg)


Color -
DLNA Certified No
Dimensions (WxHxD) -
Dimensions (WxHxD, metric) -
Dimensions (notes) -
Weight (lbs) -
Unit of measurement No
Power Handling (Nominal) -
Frequency Response +/-3dB 58Hz - 20kHz +/-3dB
Sensitivity (1W/m) -
Terminals No
Impedance 6 Ohms
Tweeter -
Midrange Driver -
Woofer -
Crossover Frequencies -
Crossover Type -


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