One of the benefits of in-ceiling speakers is how easily they disappear into a room. Unfortunately, the sound coming from the back of the speaker doesn’t disappear and can distract those in the rooms above the speakers. MartinLogan offers back boxes, or enclosures, for Motion CI and Motion XT CI In-ceiling speakers. For these situations where sound control is desired, these retrofittable back boxes are the perfect solution. They offer 20dB of noise reduction into adjacent areas and offer the perfect solution to achieve consistent performance where ceiling cavity sizes may vary throughout an installation. Please note that the volume of air in the retrofit enclosure is smaller than that of your ceiling, and bass extension will be reduced. If sound control is not necessary for your unique installation, we recommend not using the back box so the speaker can take advantage of the larger airspace in your ceiling cavity.
Q: Which MartinLogan speaker models are compatible with the C8BXR back box?
A: The C8BXR back box is compatible with the MartinLogan MC8 and XTC8 speaker models.
Q: What is the diameter of the cutout required for installing the C8BXR back box?
A: The C8BXR back box requires a cutout diameter of 9.25 inches for installation.
Q: What is the purpose of the MartinLogan back boxes?
A: MartinLogan back boxes, or enclosures, reduce the sound that travels from the back of in-ceiling speakers to adjacent rooms.
Q: Are there any drawbacks to using the back boxes with my speakers?
A: Yes, using the back box will reduce bass extension because the volume of air in the enclosure is smaller than that of your ceiling.
Q: How much noise reduction do the back boxes provide?
A: These back boxes offer 20dB of noise reduction into adjacent areas.
Q: Does MartinLogan recommend always using the back box?
A: If sound control is not an issue, MartinLogan recommends not using the back box so the speaker can utilize the larger airspace in your ceiling cavity.
Q: Do these fit the IC8 series?
A: Unfortunately, they do not, they only fit the MC8 and XTC8 speaker.
Q: Are these to cap your subwoofer speakers?
A: Hello. These backboxes are designed to work with our in-wall MC8 and XTC8 speakers. The speakers have an exposed back, so adding the backbox can help redistribute the sound waves to listeners below and help remove sound that can transfer to the floor above.

One of the benefits of in-ceiling speakers is how easily they disappear into a room. Unfortunately, the sound coming from the back of the speaker doesn’t disappear and can distract those in the rooms above the speakers. MartinLogan offers back boxes, or enclosures, for Motion CI and Motion XT CI In-ceiling speakers. For these situations where sound control is desired, these retrofittable back boxes are the perfect solution. They offer 20dB of noise reduction into adjacent areas and offer the perfect solution to achieve consistent performance where ceiling cavity sizes may vary throughout an installation. Please note that the volume of air in the retrofit enclosure is smaller than that of your ceiling, and bass extension will be reduced. If sound control is not necessary for your unique installation, we recommend not using the back box so the speaker can take advantage of the larger airspace in your ceiling cavity.

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