Audio Design Associates Cinema Reference Mach II PTM-8150 - Manual (Page 56)

Page 55
Bass Setup 4
The Cinema Reference provides you with the ability to engage a Bass Peak Limit Manager that oper-
ates in a range from 0 dB (decibels) to -24 dB. The function of the Bass Peak Limit Manager is to
reduce the possibility of overloading the subwoofer in cases of extreme volume and/or software that
provides extremely dynamic bass information. If your subwoofer is capable of providing a large level
of bass without bottoming out, you may not need to engage the Bass Peak Limit Manager. If however,
you play your system at volume levels that, on occasion, will cause your subwoofer to play distorted
audio segments, you will wish to engage the Bass Peak Limit Manager. The Cinema Reference’s “Out
Of The Box” setup has the Bass Peak Limit Manager, also known as the Bass Limiter, set to -24dB, the
THX reference. There are two different ways in which to set the Bass Limiter on the Cinema Refer-
ence Mach II, using either a pink noise or using actual playback material. The first is described in this
segment and the latter in the segment below.
The Bass Peak Limit Manager has a range with the options of OFF or -24 dB up to 0 dB. The range
operates as such: As an example, assume that the Bass Peak Limit Manager is set to -12dB. During
operation, as the Master Volume Level is raised and goes above -12 dB, the volume of the subwoofer
channel will stop rising. As such, regardless of how loud the sound system gets (-11 dB all the way to
+10 dB), the bass level will never exceed -12 dB bass limit. To turn off or adjust the Bass Peak Limit
Manager using test tones:
1 Turn the Mode knob clockwise until the display’s second line reads SETUP MENU and then
press the Mode knob.
2 Turn the Mode knob clockwise until the display’s second line reads PRO SETUP and then
press the Mode knob.
3 Turn the Mode knob clockwise until the display’s second line reads STEP 4 BASS and press
the Mode knob.
4 The pink noise will play through the subwoofer and the display will indicate the current set-
tings. To change the settings, turn the Mode knob. To turn the limiter completely off, turn
the Mode knob counterclockwise until the display reads LIMITER OFF.
5 Press the Mode knob to exit this setup menu. Turn the Volume knob to completely exit the
setup menu.
Bass Limiter
The BASS LIMITER under Pro Setup is manual and does not provide any subwoofer noise (as in
Noise Test). To set the Bass Peak Limit Manager in this manner requires that you listen to your
subwoofer for distortion. You can use either STEP 4 BASS or BASS LIMITER to dial in the desired
Bass Peak Limit Manager level or to turn it completely off. You do not need to use both methods, as
adjusting one, will affect the other. To set the Bass Peak Limit Manager using no test tones:
1 While in the Pro Setup menu, turn the MODE knob clockwise until the display reads BASS
LIMITER and then press the MODE knob. The Cinema Reference’s display will read BASS
LIMITER on the top line and the second line will read OFF or LIM and a number (-24 to 0
dB).
2 Turn the MODE knob gradually and stop just prior to the subwoofer distorting. You can also
turn the Mode knob counterclockwise until the display reads LIMITER OFF.
3 Press the Mode knob to exit this setup menu. Turn the Volume knob to completely exit the
setup menu.