Setting the phase control to 180 degrees reverses the polarity of the subwoofer. But your center and surround speakers will still likely work best run as "small" speakers. That location can work wonders and really improve the sound of your subwoofer. But if you don't like the change, return to the previous setting or rerun the auto setup to return to your original calibration settings. The numbers below highlight general guidelines for speaker/subwoofer crossover frequencies. One of the other controls you may find on your subwoofer's rear panel is marked "phase." It's provided because the speakers and subwoofer sound best when they are in-phase -- meaning their woofers move in and out in sync with each other. Merely buying a great subwoofer is no guarantee that you'll wind up with great bass. Adding delay to the subwoofer signal can sometimes help the subwoofer to integrate better with the loudspeakers in the room. When all else fails, try placing the sub as close as possible to your couch or chair, with the sub in the "end table" position. Precisely matching the volume levels of the front left, center, right, and surround speakers is important, but subwoofer volume is more subjective. If you're having problems finding the perfect spot, try this method: move your couch or chair out of the way, or into another room, and put the sub in the listening position. Yes, I know that sounds like a crazy idea, but it's just for test purposes. If you're lucky enough to have large floor-standing speakers with 8-inch or larger woofers, you may wish to run them as "large" speakers. Here you can see the Sub In connection on the Hsu's rear panel; on other subs the input may be labeled LFE, Direct, or Bypass. ALL RIGHTS RESERVED. Next, turn the sub's (low-pass) crossover control knob to its maximum, highest numerical setting (you're going to rely on your AV receiver's internal crossover control to route the mid and high frequencies to the speakers and the bass to the sub). If they were out of phase, he'd hear a double thump.That's with passive subwoofers, though. I can set the sub's volume level with DVDs in 10 minutes or less, but with CDs I might be fiddling around for days. Turn the volume control halfway up. Learn how to correctly set up your subwoofers for optimal placement and connectivity. First, you will need to set all of your speakers so that they are facing the same direction. Now, you may end up with subwoofers that are out of phase with each other. We delete comments that violate our policy, which we encourage you to read. For really small speakers or skinny sound bars, keep the sub as close as possible to the speaker(s). If you're still not satisfied with the sound try using the receiver's manual speaker setup. When in doubt about the speakers' sizes, always select "small" on the setup menu. Your speakers' or subwoofer's user manual may offer specific guidance in this area; otherwise use the Audiophiliac's crossover recommendations: for small speakers with 2- or 3-inch woofers, try settings between 150 and 200Hz; for midsize speakers with 4- or 5-inch woofers, use 80 or 100Hz; and with large bookshelf speakers or skinny floor-standing speakers, try a 60 or 80Hz crossover. Three things can affect the output of your sound system when testing your subwoofer crossover: Overlap of your large, small, and main speakers The volume output of your subwoofer and speakers Then again, don't be surprised if the sub still doesn't sound as good as you think it should. That might be all you need to do. How long is long enough? Discussion threads can be closed at any time at our discretion. You may have to try a few different recordings before you hear any difference, and it might help to turn up the sub's volume level for this test. On some receivers you'll be presented with a wide range of subwoofer or crossover settings, from 40Hz up to as high as 250Hz. If the sub and main speakers were in phase, he'd hear a single thump when he connected the battery to the wires leading to the sub's terminals. The Hsu Research subwoofer's rear panel pictured on the right is fairly typical. You'll be amazed just how different the bass sounds in different locations -- some will be muddy, some will sound louder, and some will reduce the bass volume.

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