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Richard Modafferi Phones & Addresses

  • 504 Skyline Dr, Vestal, NY 13850

Work

Position: Sales Occupations

Education

Degree: High school graduate or higher

Business Records

Name / Title
Company / Classification
Phones & Addresses
Richard Modafferi
Director
MODAFFERI ACOUSTICAL SYSTEMS, LIMITED, INC
13111 Laliquie Ct, Palm Beach Gardens, FL 33410
13111 Ln Lique Ct, West Palm Beach, FL 33410
Rdi Skyline Dr, Vestal, NY 13850

Publications

Us Patents

Infinite Slope Loudspeaker Crossover Filter

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US Patent:
7085389, Aug 1, 2006
Filed:
Sep 30, 2003
Appl. No.:
10/677160
Inventors:
Richard T. Modafferi - Vestal NY, US
Assignee:
Modafferi Acoustical Systems - Palm Beach Gardens FL
International Classification:
H03G 3/00
H03F 21/00
US Classification:
381 99, 381 98, 381100, 381120
Abstract:
An improvement to inventor's prior art loudspeaker crossover filter invention is described. A substantially flat network input-impedance characteristic across the audible frequency range is provided by the addition of at least one series connected constant resistance network at the input terminals of the crossover filter system. By relaxing certain infinite slope filter parameters, more uniform acoustic polar response of the loudspeaker system is obtained. Specifically, infinite slope methods are used for the upper (higher frequency) band-edge of low-pass and band-pass filters, and optionally, for high-pass filters. Infinite slope characteristics, however, are relaxed for the lower frequency slope of band-pass filters and, optionally, for high-pass filters. In addition, the crossover network uses fewer components than infinite slope crossovers of the prior art.

Low Range Loudspeaker System

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US Patent:
39846350, Oct 5, 1976
Filed:
Mar 11, 1975
Appl. No.:
5/557272
Inventors:
Mioljub R. Nestorovic - Binghamton NY
Richard Modafferi - Vestal NY
Assignee:
Electro Acoustical Labs, Inc. - New York NY
International Classification:
H04R 128
US Classification:
179 1E
Abstract:
An audio speaker system that provides enhanced fidelity of sound reproduction in the bass acoustic frequency range, by comprising a usual driven primary radiator, a pair of conductors for connecting the primary radiator to its energy source, a driven auxiliary radiator connected to that pair of conductors via a reactive network, both radiators being acoustically coupled by being housed in a closed cabinet common to both of them except for the respective separate diaphragm openings for each of said radiators, and the respective function and value of the individual component elements of said network relative to one another and the volume of the cabinet are such as to have the system operate on the bass-reflex principle.

Phase Shift Low Frequency Loudspeaker System

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US Patent:
44031122, Sep 6, 1983
Filed:
May 18, 1981
Appl. No.:
6/265045
Inventors:
Richard Modafferi - Vestal NY
Assignee:
Modafferi Acoustical Systems, Ltd. - Baldwin NY
International Classification:
H04R 128
US Classification:
179 1E
Abstract:
An audio speaker system is disclosed providing improved fidelity of performance from overdamped woofer drivers in small sealed enclosures. At least two woofer drivers are employed, and are driven electrically in such a manner that the phase difference in the electrical signals to the two drivers, or sets of drivers if more than two are employed, will be near zero at the lowest bass frequency and will increase to a value up to 180 degrees at the highest bass frequency which is generally taken as the woofer-midrange crossover frequency. This aforementioned phase difference in the electrical signal inputs to two sets of woofers common to one sealed enclosure improves over prior art by providing increased low-bass acoustic output, less acoustic wave interference between the woofers and the midrange drivers, and a smoother input impedance characteristic in the bass frequency region.

Audio Frequency Power Amplifier With Improved Circuit Topology

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US Patent:
49183940, Apr 17, 1990
Filed:
Mar 23, 1989
Appl. No.:
7/328110
Inventors:
Richard Modafferi - Vestal NY
Assignee:
Modafferi Acoustical Systems, Ltd. - Baldwin NY
International Classification:
H03F 500
US Classification:
330 3
Abstract:
The present invention is an audio frequency power amplifier input circuit having improved vacuum tube circuit topology. The improved circuit includes a direct current feedback circuit within the input circuitry which stabilizes the operating point of a phase inverter. The feedback circuit maintains optimum operation of the circuit despite variations in tube characteristics or supply voltages. Another aspect of the improved circuit comprises a low impedance phase inverter which improves the drive capability of the phase inverter to push-pull power output vacuum-tube grids.

Multidriver Loudspeaker Apparatus With Improved Crossover Filter Circuits

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US Patent:
47714662, Sep 13, 1988
Filed:
Oct 13, 1987
Appl. No.:
7/108365
Inventors:
Richard Modafferi - Vestal NY
Assignee:
Modafferi Acoustical Systems, Ltd. - Baldwin NY
International Classification:
H04R 314
US Classification:
381 99
Abstract:
A loudspeaker system includes at least two loudspeaker drivers, together with an electrical crossover network having filter circuits with at least two separate mutually exclusive frequency passbands. The filter circuits comprising the crossover network each possess brick-wall amplitude responses, i. e. , passbands with very high band-edge amplitude vs. frequency response slops, on the order of 100 dB/octave in the better embodiments. The high passband band-edge slopes, which are realized by the inclusion of transmission zeros in the separate crossover filter transfer functions, takes together with further appropriate crossover filter transfer function synthesis causes the separate loudspeaker drivers comprising the loudspeaker system to function independently of one another in their contribution to total system acoustic output. It is shown that the loudspeaker system permits an accurate approximation to the ideal delay function in acoustic space, while minimizing acoustic wave interference among drivers operating in adjacent frequency band, and also reducing overall system nonlinear distortion.
Richard T Modafferi from Vestal, NY, age ~86 Get Report