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Home Entertainment:

How to set up a subwoofer

By Steve Guttenberg, CNET.com
04/09/2009



 


Step 3: Make the right connections


Channel bass signals from your receiver's sub-out to the subwoofer.
Subwoofers' connection schemes vary; some have just one input, while others separate left and right RCA jacks. In most cases, however, you'll just need to run one cable from your receiver's sub-out jack to the subwoofer. If your sub has direct or bypass inputs--or a switch labeled Bypass--we recommend using those connectors or that switch.

We strongly recommend the above hookup technique, but if your receiver lacks a subwoofer output and your subwoofer has speaker-level inputs, hook up them to your receiver's front right and left speaker terminals, just as you would with the speaker's connections. [Take care not to reverse the plus (+) and minus (-) connections on the subwoofer and receiver.] This hookup method will require doubling up the wires on the receiver's connectors, so you'll wind up with two wires on the red (+) and another two on the black (-) left and right connectors. Alternatively, if your receiver has A and B connectors and you're not using the Bs, go ahead and hook up the sub cable to the B connectors. Just remember to turn on the B speakers, or the sub won't make any sound.

Tip:

If your sub doesn't have a bypass or direct input, raise the sub's variable crossover filter control to its highest setting. That might be somewhere around 150Hz to 200Hz.

Warning:

CNET Asia is not responsible for any injuries or equipment problems that may occur during or after you connect your subwoofer. Consult the relevant instruction manuals and warranty information before making any changes to your system's setup.

Step 4: Adjust your receiver's setup menu


Configure the receiver's menu to integrate the sub with the rest of the speakers.
A/V receivers always have some sort of setup menu that appears on the receivers' front-panel display. Most US$500-and-up models also feature easier-to-use onscreen menus, which are displayed on your TV. In either case, these menus typically cover every aspect of setup such as multiroom configuration and assigning digital inputs. You'll also find the vital controls that allow the receiver to send signals to the subwoofer via its sub-out connector, mentioned in the previous step.

To access the subwoofer options, you usually need to enter the speaker-setup menu. Then find the toggle or submenu that lists Subwoofer: On/Off, and select On. (Some receivers use other language such as Subwoofer: Yes/No.) Once engaged, the receiver will route the low-frequency bass effects to the subwoofer when needed.

Also important: Select the size of the satellite (front, center, and surround) speakers. Large doesn't refer merely to the size of the speaker's cabinet; the speaker's woofer size is just as relevant--anything smaller than 6 inches is always considered small. Then again, a lot of satellites with 6-inch woofers still sound better when set to Small. Experiment with movies and music at both settings and see which sounds best to you.

Most--but not all--receivers let you select the crossover point (also called low pass filter) for the subwoofer; that determines the upper frequency limit of sound the receiver sends to the subwoofer. With large satellite speakers, set the crossover to 80Hz or 100Hz; for smaller sats, start with a higher crossover point, 120Hz or even 150Hz.

Tip:

If you've hooked up your subwoofer with speaker wire instead of the interconnect cable we discussed in step 3, set the front speakers to Large. Since the speakers will receive lots of bass, even if they can't reproduce it, they may distort at high volume levels. That's especially true for very small speakers or ones with 4-inch or smaller woofers.

Tags: cable, home theater, Monster, performance, manufacturer
 

 
 

    Talkback
chungwei says...
I see that the picture of the subwoofer is the Mordaunt Short Genie that comes with SPL meter.
May I know how I should set it up using the SPL meter? I tried playing through the tracks on the CD but one thing i'm not sure is which direction should I point the SPL meter towards? Towards the Subwoofer perhaps? Height ?

pls advice.

 
 
PhilipWong says...
Towards the sub. You may like to set the sub a few dB "hot" for more oomph. Not too much or it will bottom out during bass-intensive scenes.

 
 
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