CHANTICLEER, a 12-member male a cappella ensemble from the United States will give its debut performance in Hongkong at the Cultural Centre Concert Hall on April 11 at 8 pm. Chanticleer, the only full-time professional a cappella vocal ensemble in the US, has a unique artistic profile. The group has developed a remarkable reputation for its interpretation of a broad range of vocal literature, from Renaissance to gospel and new commissioned music. Chanticleer's sound, a seamless blend of male voice ranging from countertenor to bass, has earned the group its reputation as ''an orchestra of voices''. Founded some 14 years ago, the group has thrilled and delighted audiences across the United States, Europe and Asia. Music director Joseph Jenning, who is a singer, conductor and prolific arranger of pop music, gospel and spirituals, joined the group in 1983 and has been in the present post since 1984. Chanticleer's New York debut at Alice Tuely Hall in 1984 set the stage for major recognition in America. Today, Chanticleer performs over 80 concerts each season in Europe and the United States. In a review of the concert, the New York Daily News dubbed Chanticleer: ''The outstanding male vocal ensemble whose individual voices are as attractive to hear as their flawless blend.'' Chanticleer has taken its intoxicating sound overseas, including appearances in Singapore, the famed Schleswig-Holstein festival of Germany and Bridges of Song Festival in Tallinn, Estonia. The group has travelled twice to Taiwan to perform in the Taipei International Choral Music Festival. So taken were the Taiwanese with Chanticleer's inimitable sound the first time there, that Taiwan television travelled to San Francisco to film a show devoted to the ensemble. Over the years, it has also developed its own annual home series in San Francisco, as its subscription base swelled, the programme expanded to other cities of the region. The ensemble has also enhanced San Francisco's musical life with its celebrated annual Christmas season, also recently offered in many of the most beautiful missions and churches throughout California. Repertoire of the debut of Chanticleer in Hongkong will include works of the Renaissance, new commissioned works, gospel, spirituals, vocal jazz and a selection of German songs, barbershop and folk songs. Tickets at $60, $80, $100 and $120, with half-price tickets for students and senior citizens are available at all URBTIX outlets. For telephone reservation, call 734 9009.