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MartinLogan Subwoofer Control App

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Subwoofer Control App: Low Pass Filter (Crossover)

Created: Jul 17 2018 | Updated: Aug 24 2018

The Low Pass Filter screen lets you to adjust the low-pass frequency for the left and right (RCA or speaker level) inputs. This setting is not applied to the LFE (RCA or XLR) inputs, instead leaving the task of bass management to your audio/video processor.

Dynamo subwoofers offer exceptional performance in both 2-channel (Left In/Right In) systems and multi-channel (LFE In) home theater systems. Dynamo 800X, 1100X, and 1600X offer the ability to connect both Left In/Right In and LFE In, allowing you to achieve an optimum setup for 2-channel listening while still allowing for multi-channel (movie) mode listening. When listening to stereo source material the system achieves optimum music integration with the subwoofer playing below the front speaker’s lowest response frequency. While watching a movie the LFE track and the bass from the surrounds can be fed to the subwoofer using (low pass) crossover settings from the processor’s bass management system.

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 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 Dynamo 600X as an LFE channel (connected 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/processor'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 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.

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