THOMAS E MACDONALD
Plumbers in Boston, MA
License number
Massachusetts 6613
Issued Date
Jun 25, 1973
Expiration Date
May 1, 1990
Type
Apprentice Plumber
Address
Address
Boston, MA 02131
Professional information
Operations/Corporate Actions Manager At Numeric Investors
Position:
Operations/Corporate Actions Manager at Numeric Investors
Location:
Greater Boston Area
Industry:
Investment Management
Work:
Numeric Investors
-
Operations/Corporate Actions Manager
Owner At High Level General Contracting
Position:
Owner at High Level General Contracting
Location:
Greater Boston Area
Industry:
Construction
Work:
High Level General Contracting
-
Owner
Modular Acoustic Horns And Horn Arrays
US Patent:
2011006, Mar 24, 2011
Filed:
Oct 6, 2010
Appl. No.:
12/898947
Inventors:
David Edwards Blore - Westborough MA, US
Paul F. Fidlin - Wayland MA, US
Soichiro Hayashi - Framingham MA, US
Thomas E. Macdonald - Boston MA, US
Peter C. Santoro - Shirley MA, US
Paul F. Fidlin - Wayland MA, US
Soichiro Hayashi - Framingham MA, US
Thomas E. Macdonald - Boston MA, US
Peter C. Santoro - Shirley MA, US
International Classification:
H04R 1/02
US Classification:
381338
Abstract:
A modular horn type loudspeaker and a modular horn array formed of modular loudspeakers. An acoustic horn includes a first acoustic module. The first acoustic module includes a first acoustic driver and a first acoustic duct, for conducting acoustic energy from the first acoustic driver. The first acoustic duct has a first opening through which acoustic energy is radiated. The first acoustic duct is characterized by a first centerline. A second acoustic module includes a second acoustic driver and a second acoustic duct, for conducting acoustic energy from the acoustic driver. The second acoustic duct has a second opening through which acoustic energy is radiated. The second acoustic duct is characterized by a second centerline. The first module and the second module are configured to be positioned and held in place so that the first and second openings are aligned to form a substantially continuous diffraction slot and so that the first and second centerlines are normal to an arc and intersect at a first one of a plurality of angles.