10 Placement & Setup
Subwoofer Placement
Single Subwoofers
If you are using a single subwoofer, then, generally speaking, the ideal location would be in the front of the room, between the LRs, or close to or in a corner (see Figure 8). Every room has its own unique sound characteristics, and flexibility in the exact placement of subwoofers is always desirable.The closer a subwoofer is placed to a wall and especially a corner, the more and deeper the bass response you will hear. However, in some rooms, corner placement can produce too much bass or a “one
System Setup and Operation
When using the
Level - THX / Preset or approx 1/3 up from minimum Lowpass - THX / External or set to highest frequency Phase - Normal / 0 Degrees
note” boomy effect.Under such circumstances the subwoofer may work
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The LOW PASS Control
better away from the wall or corner.You should experiment to find the best position in your room.
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When used with a complete THX Certified speaker system, the
Figure 8
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Helpful Hint: A particularly useful experiment is to place the sub- woofer right at the prime listening position (move the couch or chair out of the way and put the sub in its place). Then play something with lots of good bass (preferably music), and walk around the room, listening to the subwoofer’s response. When you locate an area that has ample amounts of
Dual Subwoofers
When two subwoofers are used you may wish to place them asymmetri- cally; that is,in slightly different positions in the room (Figure 9).This will reduce common mode room resonances that typically occur with sym- metrically placed subwoofers. Another good option is to place the sub- woofers in the same corner. Several tests have shown this to be a viable means of producing smooth bass response in many rooms.
Figure 9
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Preamplifier's amplifier’s LOW PASS control by setting it to the THX/EXT setting. All THX certified satellites have been optimized to work with an 80 Hz crossover point.
If your Processor/Receiver has no internal crossover (a fairly rare occur- rence these days) the
Higher crossover frequencies pass more bass to the subwoofer but can quickly begin to sound boomy. They also make it easier to localize the subwoofer sonically, which is highly undesirable. Higher crossover fre- quencies 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 lowest bass frequencies that are in the range where the 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 LOW PASS crossover frequency,smaller speakers means a higher LOW PASS cross- over frequency. You may also contact the manufacturer of your satellite speakers for their specified low frequency response to determine the appropriate LOW PASS setting on your subwoofer amplifier. In the end, however, a little time spent experimenting will generally result in dra- matically better bass response.
A Word About Bass, Center Channel Modes, and System Setup: Many Dolby Pro Logic surround processors and surround receivers provide a choice between “Wide” (full fre- quency range) and “Normal” (restricted low frequency) 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.
Bass Management
Today, many processors and receivers offer Bass Management capa- bility. If yours does it will ask you to choose between Large and Small loudspeakers during the system setup procedure.When speakers are set