西特尔科技--CE-3231F

　　CE-3231F is an advanced-function EQ. Results: 1) 31 Feedback Frequency Display 2) Feedback Indicated thre shold 3) Variable filter 4) Output clip display 5) Input Signal level VU display 6) Constant Q 7) Balanced / Unbalanced Constant Output level 8) No strike to the amplifier when power ON/OFF 9) No power signal bypass.
　　The feedback indicator of CE-3231F only hints a feedback frequency of the highest feedback level at the same time. When more than two of the indicators are illumined as several feedback frequency levels is approached. You can adjust "DISPLAY THRESHOLD" to *** the biggest level one in several frequencies. Sometimes, a level of the feedback frequency level is rather lower than pre-planed indicated level (0dB), However if you want to view the point, you can use "DISPLAY THRESHOLD" to turn to lower the feedback indicated threshold level till the LED of the EQ is illumined.
　　If you want to filtrate some useless frequency from input, you can use "FILTER" through “d”to adjust the frequency which you don't need.
　　Don't adjust two neighboring frequency points that is far away from each other. Otherwise, it will result in a frequency deflection. For example: If 1KHz is Increased +15dB,and 1.25KHz is reduced to -15dB.In fact, a frequency in 800KHz-1KHz has increased 15dB and a frequency in 1.25KHz-1.6KHz has reduced 15dB. This kind of phenomena is very universal.