10 Care of Your Subwoofer
Model 102, 212 and 422 SB Powered Subwoofer
Dual Subwoofer Placement
When two subwoofers are used,you may wish to place them asymmetri- cally; that is, in slightly different positions in the room (Figure 7). This will reduce common mode room resonances that occur with symmetri- cally positioned subwoofers.You can also try placing the subwoofers in the same corner,if you wish.Experiments have shown this to be a viable means of producing smooth bass response in many rooms.
Figure 7
Asymmetrical arrangement for 2 subwoofers in a home theater, for example, one closer to a corner than the other
Place subwoofers |
assymmetrically in room |
for smoother bass |
Using the Subwoofer Crossover Control
When used with the System 1200 or 2200, the Crossover control should be set at around 100Hz unless you are using a pro- cessor with its own
40 Hz140 Hz system by ensuring that the subwoofer and satellites produce a cohesive and well integrated sound“picture.”
Many surround sound receivers and processors offer a choice of cross- overs,typically between 80 Hz and 120 Hz.If yours does,we recommend using the 100Hz setting when using small speakers such as those in the System 1200 or 2200.Consult your electronics owner's manual for more details.
Higher crossover frequencies pass more bass but can sound boomy and may be more easily localized to the subwoofer. Higher crossover frequencies may be suitable, however, when using very small satellites that have no real low frequency performance. Settings lower than 80Hz should be employed if you are using larger speakers that have extended bass response.This way,the subwoofer will only reproduce the very low- est bass frequencies that are in the range where the large main speakers begin to roll off.
It’s generally undesirable to have the main speakers and the subwoofer overlap too much. Larger speakers means a lower
The Phase Invert Control
A subwoofer operating out of phase
NORMAL 
INVERT with the rest of the system won’t pro- vide optimum low frequency perfor-
mance. Also, the correct subwoofer phase can enhance room acoustics. Since there is so much variation in the industry regarding phase, a switch that will reverse the phase of the subwoofer is provided on the amplifier panel.Listen to a monaural musi- cal source with strong bass content.(For example,you can use the mono switch on an FM tuner or preamp, or use a
Experiment with the position of the phase switch to get the smoothest bass.It should be obvious which is the correct setting.In particular,there will be a more integrated transition between the satellites and the sub- woofer when they are properly phased.
A Word About Bass, Center Channel Modes and System Set Up
Many surround processors and receivers feature a“Wide” and“Normal” mode for the center channel speaker.Atlantic Technology recommends that the center channel be operated in the “Normal” mode when using a powered subwoofer. The center channel speaker will sound more dynamic and the intelligibility of the system will generally be improved when in the“Normal” mode.
With discrete digital 5.1,6.1,or 7.1 channel systems (Dolby Digital,DTS, etc.) many controllers provide a Bass Management option,which lets you set the front and rear speakers in a limited bandwidth (Small) or full range (Large) mode.When using a subwoofer with Atlantic Technology speakers we recommend setting such a controller to the Small position for all the speakers in the system.
Care of Your Subwoofer
The 102 SB, 212 SB and 422 SB are constructed from Medium Density Fiberboard. MDF is a
IMPORTANT: Save Your Boxes! If you can do so, save the carton, packing pieces and plastic bags that came with your subwoofer. They will be useful in case you move or have to ship your sub- woofer for any reason. In any case, save all packing materials until you are certain that the system has suffered no damage in ship- ment. If you find such damage, either visible or internal, contact your dealer immediately for the proper return procedure.
