# US 2019/0356986 A1 · Loudspeaker Impedance Matching Device for Non-Permanent Applications

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- Number: US 2019/0356986 A1
- Document ID: US20190356986A1
- Status: Published application
- Kind: A1
- Application number: 15/983,061
- Filed: 2018-05-17
- Published: 2019-11-21
- Earliest claimed: 2018-05-17
- Assignees: Wiersum Enterprises, Inc.
- Inventors: Benjamin K. Wiersum
- Web page: https://patentgrep.com/patent/US20190356986A1

## CPC

- H01F 19/02: Audio-frequency transformers or mutual inductances, i.e. not suitable for handling frequencies considerably beyond the audio range
- H04R 9/02: Details
- H01F 27/2828: {Construction of conductive connections, of leads}
- H04R 3/12: for distributing signals to two or more loudspeakers {(specially adapted for hearing aids H04R25/407)}
- H04R 3/007: {Protection circuits for transducers}
- H04R 2227/005: Audio distribution systems for home, i.e. multi-room use
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H04R: LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS (producing sounds with frequency not determined by supply frequency G10K)

## Abstract

An impedance matching device including a transformer having an input side and an output side, wherein the input side includes a first coil having a first impedance, a second coil having a second impedance, and a third coil having a third impedance. An input power connector is electrically connected to the input side of the transformer, and a pass through output power connector is electrically connected to the input side of the transformer, and the pass through output connector also is electrically connected in parallel to the input power connector. A speaker output connector having four electrical contacts is included, wherein a first pair of the four electrical contacts is connected electrically to the first coil, and a second pair of the four electrical contacts is connected electrically to the second coil.

## Claims

### Claim 1

An impedance matching device, comprising:
a transformer having an input side, wherein the input side includes a first input having a first input impedance, a second input having a second input impedance, and a third input having a third input impedance and an output side, wherein the output side includes a first output having a first output impedance, a second output having a second output impedance, and a common ground output;
an input connector electrically connected to the input side of the transformer;
a pass-through output connector electrically connected to the input side of the transformer, wherein the pass-through output connector also is connected electrically to the input connector; and
a speaker output connector having four electrical contacts, wherein a first pair of the four electrical contacts is connected electrically to the first output, and a second pair of the four electrical contacts is connected electrically to the second output.

### Claim 2 (depends on 1)

The impedance matching device of claim 1, further comprising:
a housing containing the transformer, the input connecter, the pass-through output connector, and the speaker output connector.

### Claim 3 (depends on 2)

The impedance matching device of claim 2, wherein the housing includes a front plate, and the transformer, the input connecter, the pass through output connector, and the speaker output connector are connected to the front plate.

### Claim 4 (depends on 1)

The impedance matching device of claim 1, wherein the further comprising:
an adapter connector wired to interchange connector pin assignments between an input connector and an output connector.

### Claim 5 (depends on 1)

The impedance matching device of claim 1, wherein the first output connects to an approximate impedance of eight ohms (8 Ω), and the second output connects to an approximate impedance of four ohms (4 Ω).

### Claim 6 (depends on 1)

The impedance matching device of claim 1, wherein the first output is connected to a first location on an output coil of the transformer, and the second output is connected to a second location of the output coil of the transformer.

### Claim 7

An impedance matching device, comprising:
a transformer having an input side, wherein the input side includes a first input having a first input impedance, and an output side, wherein the output side includes a first output having a first output impedance;
an input connector electrically connected to the input side of the transformer;
a pass-through output connector electrically connected to the input side of the transformer, wherein the pass-through output connector also is connected electrically to the input connector; and
a speaker output connector connected electrically to the first output.

### Claim 8 (depends on 7)

The impedance matching device of claim 7, wherein the output side of the transformer further comprises:
a second output having a second output impedance; and
a common ground output.

### Claim 9 (depends on 7)

The impedance matching device of claim 7, wherein the input side of the transformer further comprises:
a second input having a second input impedance; and
a common ground input.

### Claim 10 (depends on 8)

The impedance matching device of claim 8, wherein the speaker output connector includes four electrical contacts, wherein a first pair of the four electrical contacts is connected electrically to the first output, and a second pair of the four electrical contacts is connected electrically to the second output.

### Claim 11 (depends on 9)

The impedance matching device of claim 9, wherein the input side of the transformer further comprises;
a third input having a third input impedance.

### Claim 12 (depends on 7)

The impedance matching device of claim 7, wherein the further comprising:
an adapter connector wired to interchange connector pin assignments between an input connector and an output connector.

### Claim 13 (depends on 8)

The impedance matching device of claim 8, wherein the first output connects to an approximate impedance of eight ohms (8 Ω), and the second output connects to an approximate impedance of four ohms (4 Ω).

### Claim 14 (depends on 9)

The impedance matching device of claim 9, wherein the first output is connected to a first location on an output coil of the transformer, and the second output is connected to a second location of the output coil of the transformer.

### Claim 15

An impedance matching device, comprising:
a transformer having an input side, wherein the input side includes a first input for receiving a first power level input, and an output side, wherein the output side includes a first output having a first output impedance;
an input connector electrically connected to the input side of the transformer;
a pass-through output connector electrically connected to the input side of the transformer, wherein the pass-through output connector also is connected electrically to the input connector; and
a speaker output connector connected electrically to the first output.

### Claim 16 (depends on 15)

The impedance matching device of claim 15, wherein the output side of the transformer further comprises:
a second output having a second output impedance; and
a common ground output.

### Claim 17 (depends on 15)

The impedance matching device of claim 15, wherein the input side of the transformer further comprises:
a second input for receiving a second power level input; and
a common ground input.

### Claim 18 (depends on 16)

The impedance matching device of claim 16, wherein the speaker output connector includes four electrical contacts, wherein a first pair of the four electrical contacts is connected electrically to the first output, and a second pair of the four electrical contacts is connected electrically to the second output.

### Claim 19 (depends on 17)

The impedance matching device of claim 17, wherein the transformer further comprises;
a third input for receiving a third power level input.

### Claim 20 (depends on 16)

The impedance matching device of claim 16, wherein the first output connects to an approximate impedance of eight ohms (8 Ω), and the second output connects to an approximate impedance of four ohms (4 Ω).