
AMBICO
Manufacturers since 1955 of both wood and steel acoustic doors with steel frames. Steel doors from STC 33 - 59 and wood doors from STC 33 to 51 are available. Fire labeled products in wood or steel are tested compliant with NFPA-80 and certified by WHI. Stock units are available for immediate shipping.

International Door, Inc.
Acoustical doors are available in Vertical Lift or Sliding configurations and are the perfect solution to a difficult task. Acoustical ratings of STC 53 or greater are available. All doors are custom manufactured to your project’s specific requirements and can be provided for manual or motor operation. Sound seals are provided for all acoustical doors.

Karpen Steel Custom Doors & Frames
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Quick-ship manufacturer of 12, 14, 16, & 18 gauge hollow metal doors and 12, 14 & 16 gauge hollow metal frames, temperature rise doors, wood-grained doors, dutch doors, acoustic assemblies, lead-lined doors and frames, pocket door frames, 2-piece slip frames, elevator sub-buck and shadow line frames, round top doors and frames, gothic arch frames, and more.

Krieger Specialty Products
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Custom manufactured acoustical doors for live performance venues and industrial applications. 1-3/4" thick door available up to STC 53, and 2-1/4" doors up to STC 49, in both metal and wood veneer. 3" metal doors up to STC 55. Available for SCIF compliance. Clients include Disney Concert Hall, Kodak Theater, Seattle Symphony, General Motors and Bayer Laboratories.

Protective Door Industries
Swinging, horizontal sliding, vertical lift and multi-folding assemblies are available in PDI's line of Sonicbar® laboratory certified sound control doors with STC ratings starting at 48 and higher. From engine test cells to performing arts centers, PDI's technical staff can advise the best door solutions to meet the project's specific requirements.

Stiles Custom Metal ![]()
Sound doors with style. Stiles combines technology and style in the production of the most beautiful sound doors in the nation. When specialty sound doors and frames are required, choose Stiles. We have vast experience in handling the most complex sound projects, and take pride in combining art and technology to create a beautiful product.
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AMBICO
Manufacturers since 1955 of both wood and steel acoustic doors with steel frames. Steel doors from STC 33 - 59 and wood doors from STC 33 to 51 are available. Fire labeled products in wood or steel are tested compliant with NFPA-80 and certified by WHI. Stock units are available for immediate shipping.

International Door, Inc.
Acoustical doors are available in Vertical Lift or Sliding configurations and are the perfect solution to a difficult task. Acoustical ratings of STC 53 or greater are available. All doors are custom manufactured to your project’s specific requirements and can be provided for manual or motor operation. Sound seals are provided for all acoustical doors.

Karpen Steel Custom Doors & Frames
![]()
Quick-ship manufacturer of 12, 14, 16, & 18 gauge hollow metal doors and 12, 14 & 16 gauge hollow metal frames, temperature rise doors, wood-grained doors, dutch doors, acoustic assemblies, lead-lined doors and frames, pocket door frames, 2-piece slip frames, elevator sub-buck and shadow line frames, round top doors and frames, gothic arch frames, and more.

Krieger Specialty Products
![]()
Custom manufactured acoustical doors for live performance venues and industrial applications. 1-3/4" thick door available up to STC 53, and 2-1/4" doors up to STC 49, in both metal and wood veneer. 3" metal doors up to STC 55. Available for SCIF compliance. Clients include Disney Concert Hall, Kodak Theater, Seattle Symphony, General Motors and Bayer Laboratories.

Protective Door Industries
Swinging, horizontal sliding, vertical lift and multi-folding assemblies are available in PDI's line of Sonicbar® laboratory certified sound control doors with STC ratings starting at 48 and higher. From engine test cells to performing arts centers, PDI's technical staff can advise the best door solutions to meet the project's specific requirements.

Stiles Custom Metal ![]()
Sound doors with style. Stiles combines technology and style in the production of the most beautiful sound doors in the nation. When specialty sound doors and frames are required, choose Stiles. We have vast experience in handling the most complex sound projects, and take pride in combining art and technology to create a beautiful product.