Opera Sub 15 - dB Technologies Opera Sub 15 - Audiofanzine
dB Technologies OPERA 12 (2-way speaker) - Authorized Dealers - YouTube
The Music Store, Inc. - dB Technologies OPERA 12 2 way active speaker 12" woofer, 600W RMS, max SPL 129 dB, asymmetrical CD horn, Dimensions: 350x642x349 mm, weight: 14.3 kg (31.53 lbs.)
dB Technologies 12" Woofer
Opera Sub 12 - dB Technologies Opera Sub 12 - Audiofanzine