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Atlantic Technology IWTS-28 SUB 


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  • Adding a Subwoofer to Your Home Theater



Powerful in-wall bass that hides from view
The IWTS-28 SUB is an in-wall subwoofer that uses dual heavy-duty 8" woofers to deliver rich, vibrant bass to cusom-installed audio systems. It is easily retro-fitted to existing construction using Atlantic's GFR-626 grille/frame assembly, the same grille/frame assembly used for several other Atlantic speaker systems: the IWCB-626, the IWCB-727 THX Select 2, and the IWTS-30 LCR THX Ultra 2.

Boasting amazing hookup flexibility, the 28 SUB can either be used passively, driven directly off the receiver's front Left/Right speaker outputs by utilizing the 28 SUB's on-board low-pass crossover, OR it can be driven actively by using a power amplifier such as our SA-180 connected to the receiver's 'sub out' jack. The 28 SUB's on-board low-pass crossover is then switched to 'off,' and the crossover functions and bass level duties are handled by the system electronics, as with any powered subwoofer.

Several design features distinguish 28 SUB's amazing performance--its powerful, long-throw woofers, its solid 1"-thich (!) resonant-free MDF baffle, and its audiophile-grade crossover.

This is one serious subwoofer.

The SA-180 monoblock amplifier is the perfect companion to the 28 SUB. With 180 watts of rock-solid RMS power, a massive toroidal transformer, 12-volt trigger turn-on, and 3-position equalization switch, the SA-180 has all the right moves to make the 28 SUB perform at its best.


  • Dual heavy-duty long-throw 8-inch woofers 
  • Solid, resonance-free MDF baffle
  • Built-in, defeatable low-pass filter 
  • IR knockout 
  • Uses GFR-626 Grille/frame assembly (sold separately)


Type:  In-Wall Subwoofer

Woofers:  (2) 8" (203mm) heavy-duty, long-throw

Frequency Response:  38-200 Hz +/-3d

Nominal Impedance:  Each driver 8 ohms; paralleled together, system is 4 ohms

Crossover Frequency:  200 Hz w/built-in low-pass filter

Sensitivity:  89dB

Recommended Amplifier Power:  30-200 watts RMS

Magnetic Shielding:  No

Dimensions w/ grilles (W x H x D):  12 5/16 x 21 5/8 x 3 7/8" (312 x 547 x 100mm)

Cutout Dimensions (W x H): 11 1/2 x 20 3/8" (283 x 518mm)

New Construction Bracket (Optional): IN-NC-626

Weight: (ea)  14 lbs (6.36 kg)


System In-wall
Orientation Front-firing
Amplifier Power (RMS) 180 Watts
Amplifier type Class AB
Frequency Response +/-3dB  38-200 Hz
Max in-room SPL 102 dB
Impedance 4 ohms
Driver Size 8-inch
Woofer 2 x 8" composite
Port No
Passive radiator(s) No
Speaker Level Inputs Yes
Speaker level inputs Spring post
Speaker level outputs No
Line level input(s) Mono (SA-180 amp)
Line level output(s) RCA mono
Balanced inputs Yes
Phase control 0/180 switch
LP Crossover Frequencies 200 Hz
LP Crossover Type Fixed
Wireless No
Height (inches) 21.6"
Width (inches) 12.3"
Depth (inches) 3.9"
Enclosure MDF
Grille Plastic
Weight (lbs) 14 lbs
Color White


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