Lowell SM410A-BR
Lowell SM410A-BR

Lowell SM410A-BR

Lowell SM410A-BR
Item# SM410A-BR

Product Description


SM410A-BR: Sound Masking Speaker


Above ceiling sound masking (SM) speaker with bridge rails, 4 in. 15W single cone driver, 70V transformer, grille and backbox. Black finish. NOTE:  Speakers with mounted bridge rails are made to order (not returnable).



  • Driver:  4 in. 15W single cone driver (paper cone, 10oz. magnet, adaptor ring)
  • Transformer:  70V (0.25, 0.5, 1, 2, 4W). Selector switch includes "OFF" position
  • Enclosure:  760 cu.in (11.625 in. square x 5.625 in. deep), fiberglass lining, externally accessible input leads, SG handibox cover with knockouts, Romex connector for installations without conduit. Black.
  • Grille:  Steel grille with round perforation pattern. Black.
  • Mounting Aids:  Factory-mounted bridge-rails (offset).


  • UL 1480  General Signaling U.S.A.
  • UL 2043 Return air plenum space
  • CSAC22.2 No.205-M1983 General Signaling Canada
  • Made in the U.S.A. with global components
  • Certified U.S. steel


  • The sound masking speaker assembly for suspended ceiling installations shall be Lowell Model SM410A-BR, which shall include a 4 in. 15W single cone driver with factory-wired transformer mounted in a 760 cu.in. steel backbox with grille and externally accessible speaker leads. The wired transformer shall be 70V with primary taps at 4, 2, 1, .5, and .25 watts. The assembly shall include an externally accessible rotary switch to adjust tap selections and include an "OFF" position. Speaker leads shall exit the backbox through a strain relief clamp on a single gang handibox cover. Backbox and grille shall have a black  finish and include factory mounted bridge rails (offset)

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