Audio Design Associates Cinema Reference Mach II PTM-8150 - Manual (Page 54)

Page 53
Delay Level Setup 3
The adjustment of the Delay setting can be configured independently for each of the Cinema Reference
Mach II’s eight channels (including the subwoofer channel). The goal of setting channel delays is to
have the sound from each speaker reach the primary seating position at the same time or perhaps
better put, the correct time. Since the Cinema Reference Mach II can delay the signal of a channel
from reaching that channel’s output (and as such, the amplifier, then the speaker, and then your ears),
the delay is applied to all speakers that are closer to the listener than the furthest speaker. This
speaker, the one at the greatest distance from the primary listening/viewing position, for the sake of
this section, will be called the “Reference Speaker”, because all of the other speakers closer to the
listening position will use this speaker’s distance as a reference point.
The process of setting the de-
lays will require the use of a
tape measure or some other
distance measuring instru-
ment. ADA suggests using the
U.S./British standard to mea-
sure these distances in feet as
sound travels at approximately
1 foot per millisecond (1/100th
of a second). If you are using
the metric standard to mea-
sure your distances, ADA sug-
gests converting all measure-
ments to feet as it will be easier
to calibrate the delay time set-
tings (1 foot is approximately
equal to 30.5 cm).
The example details an ex-
treme sample speaker place-
ment where each speaker is
located at a different distance
from the primary seating posi-
tion. The chart below is filled
in with the sample distances
from diagram.
FRONT (LEFT)
FRONT (RIGHT)
CENTER
SUBWOOFER
SUR. (RIGHT)
12 Ft
17 Ft
8 Ft
7 Ft
9 Ft 9 Ft
15 Ft
10 Ft
BACK SUR.
SUR. (LEFT)
FRONT LEFT CENTER
FRONT
RIGHT
SUBWOOFER
LEFT
SURROUND
RIGHT
SURROUND
LEFT BACK
SURROUND RIGHT BACK
SURROUND
ENTER DISTANCE
OF FURTHEST
SPEAKER
(REFERENCE
SPEAKER)
1 7 1 7 1 7 1 7 1 7 1 7 1 7 1 7
ENTER DISTANCE
OF EACH SPEAKER
1 7 1 2 1 5 1 0 8 7 9 9
SUBTRACT
SPEAKER'S
DISTANCE FROM
REFERENCE
SPEAKER
0 5 2 7 9 1 0 8 8
THESE ARE THE
SPEAKER'S
DELAY SETTINGS