(19)
(11) EP 0 565 369 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
11.05.1994 Bulletin 1994/19

(43) Date of publication A2:
13.10.1993 Bulletin 1993/41

(21) Application number: 93302752.6

(22) Date of filing: 07.04.1993
(51) International Patent Classification (IPC)5: H04R 1/28, H04R 3/04
(84) Designated Contracting States:
AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE

(30) Priority: 10.04.1992 GB 9207882

(71) Applicant: CELESTION INTERNATIONAL LIMITED
Ipswich Suffolk IP3 8JP (GB)

(72) Inventor:
  • Roberts, Martin
    Suffolk IP4 2HE (GB)

(74) Representative: W.P. THOMPSON & CO. 
Eastcheap House Central Approach
Letchworth, Hertfordshire SG6 3DS
Letchworth, Hertfordshire SG6 3DS (GB)


(56) References cited: : 
   
       


    (54) Loudspeakers


    (57) A transmission line loudspeaker (20) comprises at least one driver (21), an acoustic filter in the form of a cavity (12a), and a transmission line (19). The driver (21) is positioned adjacent to the entry to the transmission line (19) so that the driver effects a parallel driving of both the filter (12a) and the transmission line (19) simultaneously. The driver can alternatively be positioned within the transmission line, again provided that it is close to the entry. The low frequency response of the loudspeaker is thereby improved.







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