60
|
loudspeakers > subwoofer type / THX boundary control
The AV32R ‘Dual Processor’ need
to know the type of subwoofer you
are using in order to apply the
correct processing.
Select
THX Ultra2
, if you have a
THX Ultra2 certified subwoofer or
one which can produce low
frequencies down to 20 Hz. Select
Normal
if you use any other
subwoofer,
None
if you have no
subwoofer in your system.
Subwoofer type
LFE Cut-Off frequency
THX Boundar y Gain Compensation
This parameter should not be confused with Bass Cut-off frequency applied to all speakers. It
describes the filter applied to the LFE (0.1) channel. The LFE Cut-Off frequency need also to
be set if you don’t have a subwoofer as it defines how the LFE (0.1) signal is mixed into your
full range speakers. If you use a THX certified subwoofer you should set the filter to
80 Hz
THX
otherwise set it to
125 Hz
.
Only if your subwoofer manufacturer requests no filter in the incoming signal, should you
select
None
.
Use
80Hz THX
if you don’t know details about your subwoofer.
If your subwoofer is THX Ultra2 certified or
goes down to 20Hz, then you can enable
THX Boundary Gain Compensation
, which
results in better bass integration when the
listening positions are close to the back
wall. Such positioning results in low
frequencies being boosted by a process
called Boundary Gain, in which the
reflected sound from the wall adds to the
direct sound from the speaker increasing its
level. THX Boundary Gain Compensation
provides additional low frequency filtering
on all channels to achieve a more natural
low frequency balance.
20
-50
-45
-40
-35
-30
-25
-20
-15
-10
-5
+0
+5
+10
+15
+20
50
100
200
500
THX Ultra2
subwoofer boundary control
with
THX Boundary Gain
Compensation
GRP00989.02-UK AV32R Dual.qxd 10/22/03 4:01 PM Page 60
