LOW FREQUENCY SPEAKER TEST - DETECT PLACEMENT OF BASE IN SELECTED FRONT CLUSTER: > When you start the test, Press the meter against the center of each speaker grill. The meter should read as follows for selected FRONT CLUSTER: - For woofers: between 86 and 92 db - For midrange: about 78db - For tweeters: about 79db > If the speaker reads above or below its range, its wiring may be switched with another speaker in its cluster.