MartinLogan Dynamo 400, Руководство пользователя

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2
Controls
Level
Setting the level too high will cause the bass to seem bloated and
is the single most common cause of bad sounding subwoofers.
A rule of thumb is that the subwoofer should not draw attention
to itself, but should simply make the systems low end seem more
extended and accurate.
Low-Pass Filter
The Low Pass Filter lets you to adjust the low-pass frequency for the
left and right (RCA or speaker level) inputs. If you are you using
this subwoofer as an LFE channel in a home theater system, set
this control to Bypass. The home theater processor will handle the
bass management.
If you are using this subwoofer in a 2-channel stereo system, set
this control. As a general rule, the Low-Pass Filter should be set
at a value approximately equal to (or below) 70% of your main
speaker’s lowest frequency response. For example, your speaker’s
frequency response goes down to 43Hz. 70% of 43Hz equals
30.1, so you should set the subwoofer’s low pass filter to 30Hz.
We advise that once you try the recommended setting using the
formula above, you should try the surrounding settings as well. If
you are uncertain of your main speaker low-frequency response,
start with a setting of 35Hz. You will not harm anything by experi-
menting with different settings.
Phase
The Phase switch allows you to adjust the phase of the subwoofer
to 0 or 180°
The Phase control is entirely dependent on numerous factors includ-
ing the size and configuration of your listening environment, the
placement of the unit, and seating arrangement. Due to the way
bass sound waves develop in different rooms there is no rule of
thumb for setting phase. For instance, if your room has a peak
at the subwoofer crossover area, you may wish to set the phase
so the actual acoustic outputs of the subwoofer and main speak-
ers are out of phase. Experiment and try different settings and be
patient.
If you are using the subwoofer to augment other MartinLogan
products, we suggest starting with the phase set at 0°.
In a system where phase and polarity are properly set, the main
speakers and subwoofer should work together and sound as if
there is more total bass in the system. If your main speakers and
subwoofers are out of phase their sound waves will cancel each
other and total bass output in the system will sound decreased.
o
verview of
C
ontrols and
C
onneCtions
Figure 1. Controls and connections. Connection options vary by model.
Status
Phase
0°
180°
+
Speaker
Level
Input
–
Left In
+
Speaker
Level
Input
–
Right In
Auto
On
Low
Pass
Filter
120
English
Figure 2. AC Power receptacle