Polk Audio LEGEND L800 User Guide - Page 2

System Checkout: 1. Start with your speakers facing straightforward and each exactly the same distance Y from the wall behind. 2. Place a chair that is centered exactly the same distance from both speakers. For best results the distance from the chair to either speaker should be equal to or greater than the distance (Z) between the speakers. 3. Check for Absolute Phase: • Disconnecting the negative (-) black wires from your speakers leaving the positive (+) red wires connected. • Switch your amplifier to mono operation or play mono source music. • Rotate the balance control back and forth until you find the lowest sound level. • If this happens at the 12 o'clock (true center) position, your speakers are in Absolute Phase. • If there is no sound at all, both speakers are out of Absolute Phase. • For Absolute Phase, you will need to reverse the connections at either the speakers or at the amplifier so that the positive (+) red wires correspond to the positive (+) red connection on the amplifier. • If the lowest sound level is heard with the balance control fully to the left, the right speaker is out of phase. • If the lowest sound level is heard with the balance control fully to the right, the left speaker is out of phase. • Reverse the out of phase speaker connection at either the speaker or the amplifier. • Reconnect the negative (-) black wires to your speakers. • Return the amplifier to stereo operation, sit in your chair and listen to a stereo recording for a few minutes. • You should hear some sounds that appear to come from an area outside the two speakers as well as sounds that appear to come from between the speakers. • By manipulating the balance control, you should be able to move the apparent sound source from far outside the left speaker to far outside the right speaker. • If your speakers do not perform as described above, proceed to the Troubleshooting section of the manual and also read the section on SDA Technology. A note about this test: the balance control position where the lowest sound level occurs has established the True Center Balance for your amplifier. Playing music at this position will give you the optimal balance and the best sound stage for your SDA speakers. Although True Center for your amplifier may change at different listening levels and some recordings are balanced more to one side than the other, this knowledge will help you get the best performance from your system.