NHT Powered Subwoofers owner manual Two tips on using the Low Pass Filter

forcement may lead to low frequency response that is uneven. Some frequencies will sound exaggerated rela- tive to others, or the subwoofer will sound thin and lack impact. The Boundary EQ control allows you to com- pensate for the effects of room boundaries on the fre- quency response of the subwoofer. Adjusting the control enables you to achieve smooth low frequency output from the subwoofer regardless of its location in your room.

The following diagrams shown in Fig. 1 show the corre- lation between subwoofer placement and Boundary EQ. These diagrams are guidelines only. Your room acoustics and personal tastes will ultimately dictate the final setting.

Fig. 1

LOW PASS FILTER: This control determines the upper- limit frequency the subwoofer will reproduce. For example, setting the filter at 100Hz will cause the subwoofer to reproduce only frequencies below 100Hz. The Low Pass Filter is continuously variable between 40Hz (low bass) and 180Hz (upper bass), to accommodate different speakers.

Two tips on using the Low Pass Filter:

As a starting point, set Low Pass Filter to the 1 o’clock position. This will result in an 80Hz low pass. As the set- ting is typical for most Dolby Digital / DTS applications. Note: The LFE input bypasses the adjustable 12dB Low Pass Filter.

See the Fine-Tuning section for further adjustment guidelines.

SUBWOOFER PHASE: This switch sets the phase of the subwoofer at either the 0° position (normal phase) or the 180° position (reverse phase) to achieve the smoothest possible bass response in your system.

This phase-reversing option is important because if bass frequencies come from both the subwoofer and the main speakers, peaks and dips in the frequency response can occur at the listening position. In these cases, reversing the subwoofer phase can improve blending and balance.

To properly set the Subwoofer Phase:

•Play familiar music, reversing phase settings. And listen from your usual position.

•Avoid evaluating while standing above the subwoofer or

amplifier; sound at the listening position will be significantly different.

•The correct setting is the one in which the bass is the loudest at the listening position.

POWER MODE: This feature automatically switches your Ten or Twelve into minimum-power mode (ie, sleep) whenever no signal is present for 20 minutes. When a signal is received, it immediately turns on again. As AUTO Mode is automatic, it requires no adjustment, nor is there a need to turn the Ten or Twelve on and off every time it is used. When in ON Mode, the subwoofer is always on.