USL JSD-100 Manual - Manual (Page 10)

Page 9
5.1
Ls
C L R
Rs
7.1SDDS
Lc Rc
7.1DS
Lrs Rrs
LFE
C L R
LFE
C L R
LFE
Ls Rs
Ls Rs
In the transition to digital cinema, the industry is adopting new names and abbreviations for speaker locations.
Generally, the first letter is capitalized and either L for left, C for center or R for right. The second and third letters,
if present, are lower case and further define the position.
New Name
(abbreviation) Description Previous Name
(abbreviation)
Left (L) Typically positioned behind the screen to the far left edge, horizontally,
of the screen center as viewed from the seating area. Left (L)
Right (R) Typically positioned behind the screen to the far right edge,
horizontally, of the screen center as viewed from the seating area. Right (R)
Center (C) This loudspeaker position is typically behind the screen corresponding
to the horizontal center of the screen as viewed from the seating area.
Also the intended speaker position for mono reproduction Center (C)
Low Frequency
Effects (LFE) Screen low frequency effects subwoofer loudspeaker(s). This is typically
one or more band-limited low frequency only loudspeakers at the
screen end of the room. Subwoofer (SW)
Left surround
(Ls) Typically an array of loudspeakers positioned along the left side of the
room starting approximately 1/3 of the distance from the screen to the
back wall and the left side of the rear wall. Left surround may not
extend to the back wall of the auditorium in some soundfield
configurations, particularly when Left rear surround is present. Left Surround (LS)
Right surround
(Rs) Typically an array of loudspeakers positioned along the right side of the
room starting approximately 1/3 of the distance from the screen to the
back wall and the right side of the rear wall. Right surround may not
extend to the back of the auditorium in some soundfield configurations,
particularly when Right rear surround is present. Right Surround
(RS)
Left rear
surround (Lrs) One or more loudspeakers typically on the back wall of the room to the
left horizontally. Back Surround Left
(BSL)
Right rear
surround (Rrs) One or more loudspeakers typically on the back wall of the room to the
right horizontally. Back Surround
Right (BSR)
Left center (Lc) Mid left to center screen loudspeaker. This loudspeaker position is
typically between the center of the screen and the left edge of the
screen, usually closer to the left. Left Center (LC)
Right center
(Rc) Mid right to center screen loudspeaker. This loudspeaker position is
typically between the center of the screen and the right edge of the
screen, usually closer to the right. Right Center (RC)
4.4
Soundfield Configurations
The standard soundfield configurations (or speaker configurations) as defined by SMPTE are shown in the diagram
below. Note there are two defined 7.1 configurations. One (7.1DS) has rear surround speakers, while the other
(7.1SDDS) extends the side surround speakers to the rear wall and adds left center and right center speakers.