Loudspeaker system

• US 4,504,704 A
• Filed: 08/30/1983
• Issued: 03/12/1985
• Est. Priority Date: 08/31/1982
• Status: Expired due to Fees

• Current Assignee: Pioneer Electronic Corporation (Pioneer Corporation)
• Original Assignee: Pioneer Electronic Corporation (Pioneer Corporation)
• Inventors: Kawamura, Tetsuo, Ohyaba, Takashi, Kinoshita, Shozo, Matsuhisa, Hiroaki, Kamishima, Minoru
• Primary Examiner(s): Rubinson, Gene Z.
• Assistant Examiner(s): NOT, DEFINED
• Application Number:
  US06/527,722
• Time in Patent Office: 560 Days
• Field of Search: 179/115.5 DV, 179/115.5 VC, 179/115.5 R, 381/117
• US Class Current: 381/332
• CPC Class Codes: H04R 2209/041 Voice coil arrangements comprising more than one voice coil unit on the same bobbin
• CPC Class Codes: H04R 3/08 of electromagnetic transducers
• CPC Class Codes: H04R 3/14 Cross-over networks
• CPC Class Codes: H04R 9/063 using a plurality of acoustic drivers H04R1/24 and H04R1/403 take precedence

Abstract

A dynamic loudspeaker unit having a voice coil formed with two windings in which a capacitor is connected in series to a parallel circuit, one circuit arm being composed of a series circuit of one of the two windings and an inductor and the other circuit arm being composed of the remaining winding. The dynamic loudspeaker unit thus constructed is housed in a bass-reflex type cabinet, whereby a shoulder characteristic having a large Q in a bass zone can be obtained, and due to a combination of the inductor and the capacitor, a desired lowest resonance frequency lower than an actual lowest resonance frequency can be selected. Thus, the reproducible bass range can be extended.

Claims

1. A loudspeaker system including a dynamic loudspeaker unit, said loudspeaker unit comprising:

a bobbin;

a voice coil having first and second windings both wound around said bobbin, said first winding being connected in series to an inductor to form a series circuit, said series circuit and said second winding forming a parallel circuit; and

a capacitor connected in series to said parallel circuit.

2. A loudspeaker system as claimed in claim 1, further comprising a first variable resistor interposed between said first winding and said inductor of said series circuit, and a second variable resistor connected in series to said second winding.

3. A loudspeaker system as claimed in claim 1, wherein said loudspeaker unit is housed in a bass-reflex type cabinet.

4. A loudspeaker system as claimed in claim 1, wherein said loudspeaker unit is housed in a closed type cabinet.

5. A loudspeaker system as claimed in claim 2, wherein said loudspeaker unit is housed in a bass-reflex type cabinet.

6. A loudspeaker system as claimed in claim 2, wherein said loudspeaker unit is housed in a closed type cabinet.