GSG Audio Design - Home of MartySubs by
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Product reviews:
Peter
2025-07-23iphone X
Full Marty build with the Ultimax UM18 full marty subwoofer
full marty subwoofer
Quintion
2025-07-22iphone Xs
First Build-Full Marty 15\ full marty subwoofer
full marty subwoofer
Harry
2025-07-29iphone 8
Mini-Marty by GSG(TM) Flat Pack full marty subwoofer
full marty subwoofer
Nigel
2025-07-24iphone 6s Plus
DIY subwoofer build - Peerless, Dayton full marty subwoofer