【 Weak current College 】 ALTO DFB2212 digital feedback suppressor use description---Power By 【 China power house network 】

Overview: DFB2212 digital feedback suppressor is a fast automatic scan quickly find feedback signal frequency and quick feedback for suppressed new while suppressor has two different modes of scanning and suppression, suitable for fixed installation site and mobile sound reinforcement situations, whether they are used that way, you can quickly eliminate DFB2212 feedback whistling, suitable for all kinds of public places.
Function keys:
Front panel
CHSEL----channel selection switch, switch to edit channel 1 or channel 2.
UTIL----the system selection menu, press to access the main system selection function, you can choose: preset mode load (LOAD PRESET), the current mode (STORE PRESET), terminate the mode setting (TERMINATOR SETUP), the filter edit (FILTER EDIT), reset the filter (FILTER RESET), MIDI control mode (MIDI), view filters (VIEW FILTER).
TERMINATOR-end feedback mode switch, press to enter the State, long press the 2 seconds after the internal filter can be set to the initial state.
ESC-give up key is pressed, the selected projects or modify abandoned. Continue to press for 2 seconds, the feedback suppressor is through a non-working state.
ENTER-enter, in the select or modify after each item, the item is pressed. Continue to press for 2 seconds, the feedback suppressor is in a connected state.
UP-up selection
DOWN-down to select
POWER-the power switch and power led
Back-panel connectors
INPUT-balanced input for card Lennon plugs
OUTPUT-balanced output for card Lennon plugs
Enter the MIDI INPUT----MIDI
MIDI OUTPUT----MIDI output
MIDI THRU----MIDI through
Connection method: feedback suppressor and system connections generally in two ways:
Link style---feedback suppressor of input connections from the device's output, the feedback suppressor of outputs connected to the next level of input device, generally use balance connection. This method is typically used for overall system feedback suppression processing. The advantage of using the equipment less adjustment easy.
Breakpoint insert mode-using three core TRS stereo plug to connect feedback suppressor of input and output side, the big three core plug tip connection Equalizer input, big three-wire Plug and ring connection feedback suppressor of output, input, output and the sharing of the signal. The big three-prong plug is plugged into the mixer input or output channel INSERT (Insert Breakpoint) socket, it is equal to the feedback suppressor intervention mixer channel internal. This method applies to separate input and output channel feedback inhibition of fine, generally used to eliminate the separate channel voice feedback whistling, without affecting the other channel.
System settings:
DFB2212 has excellent performance and a very large number of mode settings, the following details:
1. mode setting: press the UTIL to enter the system main menu, use the UP and DOWN keys to select TERMINNTOR SETUP, press ENTER to confirm the entered, select TERMINATOR MODE (termination pattern), press ENTER to confirm, use UP and DOWN keys to select the NOTCH QVAR (variable Q value notch filter) or NOTCH Q CST (constant-Q value notch filter), NOTCH QVAR (variable Q value notch filter) inhibitors slow, but the effect is good, NOTCH Q CST (constant-Q value notch filter) inhibits speed, having an effect on the sound. Requirements or mobile use NOTCH Q CST (constant-Q value notch filter), a fixed installation site use NOTCH QVAR (variable Q value notch filter). When selected, press ENTER to confirm.
Press ESC to exit submenu, use the UP and DOWN keys to select a SEARCH MODE (search pattern), press ENTER to confirm, use UP and DOWN keys to select CH1 ONLY (single channel 1 search), CH2 ONLY (single channel 2 search), CH1 & CH2 (two channels at the same time search), if you use Insert (INSERT) way to connect to the sound mixer input channel, using a separate search mode, if a thread in the system, using a dual-channel mode. Select confirm and press ENTER.
Press ESC to exit submenu, use the UP and DOWN keys to select the GAIN MODE (gain attenuation pattern), press ENTER to confirm, use UP and DOWN keys to select the GAIN VAR (variable gain), GAIN CST (constant gain), use the VAR GAIN (variable gain), speed, suitable for the occasion, GAIN CST (constant gain) inhibits a little slower, suitable for fixed installation site. Select confirm and press ENTER.
Press ESC twice to exit the SETUP menu, use TERMINNTOR UP and DOWN keys to select the THRESHOLD SETUP (boot-level setting), press ENTER to confirm, use UP and DOWN keys to select the start the level value, total 100 level. If the system is using multiple microphones quantity, possible feedback phenomenon more serious site, this number may be appropriate to increase the value in 30-50 or under field conditions. If the phone number, the better the acoustic environment of areas, the numbers in the range of 10-20. Press ENTER to exit after selection.
Editing: filter mode in the system main menu, use the UP andEDIT DOWN arrow to select the FILTER (the filter edit), press ENTER to confirm the entered, use the UP and DOWN keys to select the filter number (DFB2212 per channel 12 filters), press ENTER after the selected filter to confirm enter edit status, first use the UP and DOWN keys to select the FILTER MODE (the filter pattern), press ENTER to enter, there are two models available, AUTOMATIC (automated) and MANUAL (manual), it is recommended that you use automatic mode, when selected, press ENTER to exit. In addition, if you have devices that want to use manual mode, it can enter MANUAL (manual) mode, adjust the internal frequency (FREQ), gain (GAIN) and bandwidth (BAND WIDTH) and other parameters, adjusting the method and parameters are the same as the equalizer.
How to:
Step one, the system is switched on, the power, sound mixer settings as well as a microphone's normal level of horizontal, hold down the ESC key DFB2212 3 seconds, at which time the DFB2212 in pass-through (BYPASS), input/output level control to the minimum. Mixer level by working out signal.
Step two, observation of input level indicates DFB2212, adjust the input level control knob (INPUT LEVEL), input level indicates that reach DFB2212-6 DB to 12 DB, and then adjust the output level control knob (OUTPUT LEVEL) so that the system generates a normal voice.
Step 3, press the Enter key unlock through State feedback suppressor into operational status.
Step 4, press the TERMINATOR key 3 seconds to clear the existing filter, press ENTER to confirm the removal.
Step 5, and press the start key to access the TERMINATOR feedback suppression work status.
Step 6: save the current mode: If this is a fixed installation site, their feedback frequency relatively fixed, debugging is finished you can save the current state. By UTIL to enter the system main menu, use the UP and DOWN to select STORE and press ENTER to confirm the PRESET. Use the UP and DOWN keys to select the empty library, and then press ENTER to confirm, and want to save, the system requirements for editing a name, use the UP and DOWN keys to select the desired letter, press ENTER to confirm and edit the next letter, and so on, and finally press ENTER to confirm the Save.
Step 6: tune the memory mode: press the UTIL to enter the system main menu, select using the UP and DOWN LOAD PRESET after pressing ENTER to confirm. Use the UP and DOWN keys to select the memory of the library, and the name, and then press ENTER to confirm the transfer out.
Skills:
Initial commissioning process, adequate attenuation power amplifier input gain, increase the mixer output level, you can make the feedback suppressor to more accurately detect real feedback frequencies.
If feedback is not rapidly eliminate or system too sensitive causing distorted sound, you need to adjust the feedback suppressor detect boot level, operates as follows:
By UTIL to enter the system main menu, use the UP and DOWN to select THRESHOLD SETUP confirm entered after you press ENTER, and use the UP and DOWN to adjust the THRESHOLD value, the higher the value, the higher the sensitivity, the lower the contrary. If the system is not responsive, you increase the THRESHOLD value, otherwise decrease.