Inventor
POLK MATTHEW S
US13 patents
⚠️ This page may combine multiple inventors who share the name “POLK MATTHEW S”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
POLK AUDIO INC
6 patentsUS4569074AFeb 4, 1986
Method and apparatus for reproducing sound having a realistic ambient field and acoustic image
POLK AUDIO INC96 citations95
US4497064AJan 29, 1985
Method and apparatus for reproducing sound having an expanded acoustic image
POLK AUDIO INC75 citations95
US4489432ADec 18, 1984
Method and apparatus for reproducing sound having a realistic ambient field and acoustic image
POLK AUDIO INC77 citations95
US4638505AJan 20, 1987
Optimized low frequency response of loudspeaker systems having main and sub-speakers
POLK AUDIO INC38 citations90
US4413162ANov 1, 1983
Moving coil transducers using multiple-stranded coils
POLK AUDIO INC17 citations73
US4350847ASep 21, 1982
Subwoofer system using a passive radiator
POLK AUDIO INC16 citations73
POLK INVESTMENT CORP
5 patentsUS4903300AFeb 20, 1990
Compact and efficient sub-woofer system and method for installation in structural partitions
POLK INVESTMENT CORP62 citations95
US5475764ADec 12, 1995
Bandpass woofer and method
POLK INVESTMENT CORP22 citations92
US4924963AMay 15, 1990
Compact and efficient sub-woofer system and method for installation in structural partitions
POLK INVESTMENT CORP25 citations92
US5517573AMay 14, 1996
Ported loudspeaker system and method with reduced air turbulence
POLK INVESTMENT CORP36 citations90
US4759066AJul 19, 1988
Sound system with isolation of dimensional sub-speakers
POLK INVESTMENT CORP42 citations90