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 IW-28 SUB In-Wall Subwoofer 

Connecting the IW-28 SUB to Your System

WARNING:

 To prevent risk of electrical shock or damage to your 

equipment, always switch off the amplifier or receiver when making 
any system connections.

Speaker Connection

It’s important to observe polarity while making speaker connections: red 
(+) terminals on the amplifier to red (+) on the speaker, black (–) on the 
amplifier to black (–) on the speaker. Look carefully at the wires you are 
using and note that one of the conductors of each pair will typically be 
identified by either color, printing on the outer jacket, ridges on the outer 
jacket, or a thread intertwined with the wire strands. By convention, the 
marked wire is connected to the red (+) terminal. 
We recommend that you connect your speakers using high quality dual 
conductor stranded wire of 16 gauge or heavier, for lengths up to 25 feet 
(8m). Remember, the lower the gauge number, the heavier the wire. Use 
heavier gauge wire for longer runs. Please contact your audio/video dealer 
or installer for specific cable recommendations and further information 
regarding special circumstances. The terminals themselves are designed 
to allow the use of very heavy speaker wire or connectors.
Strip about ½" (13 mm) of insulation from the connecting wires. Connect 
them to the appropriate push terminal, being careful to observe polarity 
(positive to the red terminal, negative to the black terminal).

WARNING: 

Before turning on the amplifier, be certain that no stray 

wire strands are touching across any terminals as this might damage 
your amplifier.

Home Theater with a Monoblock Amplifier 

Connection

Leaving the jumpers in place, connect the speaker wires from the Mono-
block amplifier to one black terminal and one red terminal on the IW-28 
SUB.  (see fig 3)

2 Channel – Passive Subwoofer Connection

Remove the jumpers from the IW-28 SUB’s terminals (see fig. 4). Run 
speaker wires from the receiver’s left speaker terminals to one set of termi-
nals on the IW-28 SUB. Run another set from the receiver’s right speaker 
terminals to the other set of terminals on the IW-28 SUB. (see fig. 5) It does 
not matter which set of terminal on the IW-28 SUB is considered ‘right’ or 
‘left’. Be careful to observe consistent polarity with all the speakers. All reds 
and blacks should be consistent.

LEFT

+

+

RIGHT

Figure 4 – Removing the IW-28 SUB jumpers

Figure 5 – Connecting as a Passive Bass Module

Connections

Figure 3 – IW-28 SUB jumpers

IMPORTANT! 

Set the IW-28 SUB’s front-panel Low-Pass switch to 

the “off” position.  This will bypass its crossover.

IMPORTANT! 

Set the IW-28 SUB’s front-panel Low-Pass switch to 

the “on” position.  This will filter out any signals above 200 Hz from 
reaching the IW-28 SUB module. 

IMPORTANT NOTE: 

Each individual woofer in the IW-28 SUB is 8 ohms; 

when connecting them in parallel with your front L/R speakers (as you do 
when using the IW-28 SUB passively), the front L/R speakers should also 
be 8 ohms minimum, so that their combined paralleled impedance does 
not fall below 4 ohms. Consult your receiver’s instruction manual for 
more information on its impedance drive capability.

Summary of Contents for IW-28 SUB

Page 1: ...Instruction Manual IW 28 SUB High Performance Thin Bezel In Wall Subwoofer ...

Page 2: ...rton packingpieces andplasticbagsthatcame with your speakers They will be useful in case you move or have to ship your loudspeaker for any reason Description The IW 28 SUB is a thin bezel in wall passive subwoofer that has dual 8 long throw woofers a reinforced MDF baffle and a switchable Low Passcrossoverthatwillprovideyouyearsof enjoyment TheIW 28SUBis designedtobeusedwitheitheramonoblockamplifi...

Page 3: ...ng two IW 28 SUB modules follow the same advice locate them asymmetrically within the room and asymmetrically with regard to each other i e one near a corner one towards the middle of a wall to smooth out the bass and minimize random standing wave patterns see fig 2 Figure 2 Dual Sub Placement Connection Considerations Choosing how you connect the IW 28 SUB is dependent upon your appli cation InaH...

Page 4: ...ng on the amplifier be certain that no stray wire strands are touching across any terminals as this might damage your amplifier Home Theater with a Monoblock Amplifier Connection Leaving the jumpers in place connect the speaker wires from the Mono block amplifier to one black terminal and one red terminal on the IW 28 SUB see fig 3 2 Channel Passive Subwoofer Connection Remove the jumpers from the...

Page 5: ...studs to ensure that the clamps have adequate room to rotate into position A stud or other obstruction that s too close will stop them from properly doing their job Installation of the IW 28 SUB Removing and Installing the Grille Remove the grille from the speaker using the enclosed tool an awl or the point of a drywall screw in a grille opening near one of the grille corners Slowlyprythegrilleawa...

Page 6: ...the scrim cloth before painting the grille Startatonecornerandgen tly peel the scrim from the grill After painting the grille use air pressure to blow out any grille holesthatarefilledinwithpaint Whenthegrilleisdry re applythescrim cloth You may need to use a light coat of low tack spray adhesive to hold the scrim in place Installation If this is new construction we strongly recommend using 5 8 or...

Page 7: ...coils Frequency Response 38 200 Hz 3dB passive response Recommended Amplifier Power 30 200 Watts RMS Low pass Filter Frequency 200 Hz Sensitivity 89dB Impedance Each individual woofer 8 ohm paralleled 4 ohms IMPORTANT NOTE The power recommendation for this speaker assumes that you will not operate your amplifier receiver in a way that produces distortion Even rugged speakers like ours can be dam a...

Page 8: ...criteria stated on that application to receive an Extended ServiceAgreementthatcoversyourAtlanticTechnologyproductswellbeyondthestandard90 dayWarranty ToobtainWarrantyservice PleasecontactyourlocalAtlanticTechnologyresellertodeter mineif theyareanAuthorizedRepairCenterforAtlanticTechnologyproducts Youwillneed your original Invoice or Bill of Sale to prove Warranty eligibility If your local dealer ...

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