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AtlasIED SM42T

4" commercial weather-resistant surface mount speakers (Black)

Item # 978SM42TB

Weather-resistant, so you don't have to worry about them if a sudden downpour hits your patio.

Weather-resistant, so you don't have to worry about them if a sudden downpour hits your patio.

California customers:
Please click here for your Proposition 65 warning.

$177.98 pair

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About the AtlasIED SM42T

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Get great sound in any weather

Looking for a commercial sound solution for your open-air seating area or wraparound deck? Atlas SM42T speakers are weather-resistant, so you don't have to worry about it if a sudden downpour sweeps through. The included C-shaped mounting brackets make initial installation easy, and allow quick removal when you need to check connections or adjust the built-in 70/100V tap. The speakers' 4" woofer and 1" tweeter ensure customers can hear you paging them to their tables, and groove to piped-in music in the meantime.

Product highlights:

  • weather-resistant surface-mounted speakers with 4" woofer and 1" dome tweeter
  • handle up to 16 watts in a distributed audio system
  • frequency response: 115-16,000 Hz (±5dB)
  • sensitivity: 88 dB
  • multi-tap transformer for 70V or 100V systems
    • 2, 4, 8, and 16 watt taps
    • 8-ohm bypass setting for use with regular home audio receivers and amps
  • C-mount hardware included
  • 5"W x 7"H x 5-15/16"D
  • weight: 5 lbs. (each)
  • warranty: 5 years
  • Our 60-day money-back guarantee
  • MFR # SM42T-B

What's in the box:

  • 2 Surface mount 70/100V speakers (black)
  • 2 "C" Mounting brackets w/ tensioning knobs

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Crutchfield response

<< >>

More details on the AtlasIED SM42T

Russ B.

Features & specs

Drivers per speaker 2
Woofer Size (inches) 4
Tweeter Size (inches) 1
System Frequency response 115-16k
Maximum SPL 97dB (8')
Power Handling
Power rating 30 Watts
Peak Power rating N/A
Width (inches) 5
Height (inches) 7
Depth (inches) 5-15/16
Weight 1.5 lbs

Product Research


Overview: Atlas Sound surface mount speakers are designed for commercial, professional, and residential applications. These weather-resistant, full-range speakers can be used indoors or outdoors, in monaural or stereo configurations. Each SM-series speaker comes with a C-shaped mounting bracket.

Construction: The Strategy Series surface-mount loudspeakers feature weather-resistant construction for indoor or outdoor use year round. The talc-impregnated, injection-molded polypropylene enclosure is UV-resistant to withstand fading and breakdown. The speaker cabinet also withstands 100 hours of salt spray testing (per ASTM B117). The enclosure features powder-coated aluminum grilles with all-brass hardware inserts. The included heavy duty steel C-bracket is Zinc Chromate-plated and powder-coated, and is color-matched to the enclosure.

Paintable: The enclosure and grille can be painted to match your décor, if desired. The cabinets should be primed with two coats of spray primer before painting with oil or water-based house paint or spray paint. The grille should be removed before painting with two thin coats of paint (primer not needed). Care should be given not to clog the grille holes with paint.

Drivers: The Atlas Sound SM42T-B is equipped with a 1" Ferrofluid-cooled dome tweeter, and a highly-efficient 4" polypropylene woofer. The drivers are crossed over at 4kHz (6 dB/octave). The speaker's high-frequency TRX Waveguide System provides a full 90° horizontal and 90° vertical coverage. The PolyGuard High Frequency Circuit provides protection to the tweeter from damaging transient signals.

Wiring Options: The SM42T-B has a two-pole barrier strip terminal with a weather-resistant cover. The barrier strip can accept spade connectors or bare wire. For runs up to 500', 18-gauge wire is recommended, 16-gauge wire for 500'-1000' runs, and 14-gauge for runs over 1000'. The speaker is equipped with line matching transformers, requiring an amplifier capable of driving a 70.7V line. Depending upon the amplifier's wattage rating and the number of speakers being driven by the amplifier, you can select a 2, 4, 8, or 16-watt tap at 70.7V. You can also bypass the line transformers and connect the speaker to a consumer amplifier (the speaker has an 8Ω impedance).

Speaker Placement: The speaker is wedge-shaped, which provides a number of placement options. For outdoor use, the speaker can be placed under an eave or other protective overhang. Indoors, you can use the natural boundary effect to increase the overall output. When you mount the speaker against one surface (wall), the boundary effect will increase the output by 3dB. Mounting the speaker against two surfaces (two walls or a ceiling and wall), the output increases by 6dB. Mounting the speaker against three surfaces (in a corner near a ceiling), the output will increase by 9dB. The bottom of the speaker cabinet is flat, and 90° to the speaker baffle, allowing you to place the speaker on a shelf. You can also place the speaker horizontally in any placement option.


  • Frequency Response: 115Hz - 16kHz (±5dB)
  • Usable Low Frequency Limit (10dB down): 78 Hz
  • Power Handling:
    • 70.7V / 100V Systems: 2 - 16 watts
    • 8Ω Systems: 30 watts RMS
  • Sensitivity (1W/1M): 88dB
  • Coverage Angles: 90° H x 90° V
  • Dimensions: Width=5" Height=7" Depth=5-15/16"
  • Weight: 1.5 pounds (w/o bracket)

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Looking for more?

Check out the next model in this lineup.

AtlasIED SM52T
5-1/4" commercial weather-resistant surface mount speaker
$389.98 pair
Add to cart

Get more power handling and deeper bass

The AtlasIED SM52T offers these features:
  • handles up to 100 watts in a distributed audio system
  • frequency response: 85-20,000 Hz (±5dB)
  • .94, 1.9, 3.7, 7.5, 15, and 30 watt taps
  • threaded insert allows pole mounting
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