Settings: Phase - MartinLogan Dynamo 800X User Manual

Figure 12. Settings: 20–30Hz Level screen
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 experimenting with different settings.
Remember, because this setting only applies to Left/Right inputs. This
setting is not used if your subwoofer is only connected via a LFE input.
However, if you're using a SWT-X wireless system to connect an LFE
channel or using the D 600X as an LFE channel (connected
ynamo
via the Right In/LFE In), you will need to set the Low Pass Filter to
Bypass.
• Bypass: Select this option if you plan to use your receiver/pro-
cessor's bass management to set a low pass filter.
• Third Order: If you are using the subwoofers Left/Right inputs,
select this option to use a third order crossover to adjust the roll
off characteristics of your subwoofer's upper frequencies as they
approach the low-pass filter frequency setting. A third order filter
has a slope of 18dB per octave—a slower roll off than a fourth
order. For most applications a third order crossover is ideal.
• Fourth Order: If you are using the subwoofers Left/Right inputs,
select this option to use a fourth order crossover to adjust the
Figure 13. Settings: Rename screen
roll off characteristics of your subwoofer's upper frequencies as
they approach the low-pass filter frequency setting. A fourth
order filter has a slope of 24dB per octave—a faster roll off
than a third order.

Settings: Phase

The Phase screen allows you to adjust the phase of the subwoofer
from 0–180° in increments of 1° and also allows you to invert the
polarity of the phase.
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 speakers 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 90° (with
Inverted polarity turned on).
Figure 14. Settings: Passcode screen
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