|180,000yen(one-set, around the 1995 time)
LS5/12A Grade 1 Miniature Monitor Loudspeaker which
BBC developed as a new reference of a small speaker. Grade1 meant it as the
monitor speaker of the highest grade used for the voice check in the stage
before sending to a transmitter from studio, and LS5/8, LS5/9, LS5/12A, etc.
Incidentally, let LS3/5A be grades 2 by the object for the check
of a speech program.
15W7508BBC (product made from Dynaudio) which is a
11.5cm corn type Woofer is adopted as low-pass.
The reappearance capability
stabilized using a 7.5cm large caliber aluminum voice coil has been acquired.
D-260BBC (product made from Dynaudio) which is a dome shape tweeter of a
2.8cm caliber is adopted as a high region.
this unit ferrofluid cooling is adopted and durability is improved by promoting
thermal diffusion when a voice coil becomes a high fever by applying magnetic
oil to a voice coil.
Moreover, low distortion has been obtained with Tran Gent excellent in
molding and dumping a rear chain bar carefully.
The seal dead magnet
which prevents a magnetic flux leak is used for a unit, and the use as a TV
monitor is also attained.
By having made the characteristic of the unit
smooth, the network part enables simple-ization and has eliminated the
complicated characteristic compensation network. Moreover, the component of
highest-class grades, such as an air core inductor, is used, and the substrate
is also using usual not 1 oz but 5-oz copper.
Enclosure is designed
based on CAD, is divided to a rear bass-reflex port for the purpose of gaining
low-pass [ rich ] from small capacity, and is carrying out careful
consideration. As compared with enclosure size, the big port caliber was adopted
as this bass-reflex port at the exception, and the low-pass response is improved
by optimizing form and structure.
Moreover, acoustic diffraction is
prevented by performing round processing to a front baffle.
The thing of bi-wiring connection correspondence and
banana plug specification is adopted as a speaker terminal.
characteristic and an allowable input were given to each unit, and also what
cleared the standard of a permissible error of less than 0.25dB is adopted.
The final balance of a system gathers the pros of each field in the
studio of BBC, is optimizing them by the intensive audition of comparing the
sound of a speaker output and a live performance etc., and is polished up with
emphasis on the reproducibility not only in the theoretical measured value in an
anechoic room but an actual operating condition.
||2 way, 2 speaker bass-reflex system, and book shelf type
- Simple magnetic-shield type
||For low-pass: 11.5cm corn type (15W7508BBC)
For high regions: 2.8cm dome shape (D-260BBC)
||80Hz-20kHz±3dB (at the time of 2m and grill
||Less than 0.75dB
|Output sound pressure level
|The maximum input
||Width 184x height 295x depth of 227mm