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Fabricant : Roland
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When this range is exceeded, the button will flash and the display will respond as shown below, indicating that the hum canceling function is not working. below 40.0 Hz : LO. F. over 500. Hz : HI. F. * You can select a different mode for each channel, but not two modes for one channel at the same time. (0) Hum Cancel Frequency Knob ( A, B ) This sets the basic frequency for the hum canceler. Variable range : 40.0 — 49.0Hz ( 0.1 Hz steps ) 49.0 — 50.0Hz ( 0.2Hz steps ) * When the Hum Cancel Mode is set to Line Frequency, the basic frequency is automatically set to match the power supply frequency, and therefore the position of the Hum Cancel Frequency Knob is irrelevant. ® Hum Cancel Threshold Knob ( A, B ) This knob adjusts the input level at which the hum canceler starts working. * The Hum Cancel Threshold Knob works when either the Line Frequency or Manual mode is selected. ® Power Switch This switches the SN-550 on and off. * When the SN-550 is switched on, the Hum Cancel function is automatically set to Line Frequency and the Noise Cancel function is activated. 7 ■ PANEL DESCRIPTION < Rear Panel > (D Input Jacks ( A, B ) These are balanced 1/4 inch stereo phone jacks. Unbalanced inputs ( mono 1/4 inch phone plugs ) can also be connected. (2) Input Connectors ( A, B ) These are balanced XLR connectors. These connectors are secured by simplified stoppers and therefore will not be disconnected even if you pull the connector cables fairly hard. The pin assignments for the XLR connectors (and 1/4 inch phone jack/plugs) are as follows: Before making any connections, confirm pin assignment compatibility with all other devices. ^npui Output ■ (DGND (ground} ©HOT ©COLD (3) Output Jacks ( A, B ) These arc balanced 1/4 inch stereo phone jacks. Unbalanced outputs ( mono 1/4 inch phone plugs ) can also be connected. @ Output Connectors (A, B ) These are balanced XLR connectors. Jack Plug * Do not use the Input Connectors and Input Jacks { or Output Connectors and Output Jacks ) at the same time: damage could result. I CONNECTIONS g CONNECTIONS I'hc following are example connections. • Connecting the SN-550 before a main mixer If you wish to remove the noise of connected instruments, set up the SN-550 between the sub mixer and main mixer as shown below. By connecting the SN-550 just before the main mixer, the noise picked up by the cables of the mixers can also be removed. Keyboard sub mixer (eg. M-120) Drum sub Mixer (eg. M-120) 0 ®®®@®®®©®@@@@ 1-1 = 0 0 ©©©©@@@@©@@©©©@01_1 0 0 @®®®®®<5)@)@@®(5)® 1-1 = 0 o ®®®®®®®®©®@© ® ® © OU 0 SN-550 1 n From the Master Out To the Input Jack f or Input Connector SN-550 1 From the Master Out To the Input Jack r or Input Connector 0 □ © ^© “©© □ 0 0 □ © 1----__| □ ° From the Output Jack or Output Connector From the Output Jack or Output Connector To the Input Jack or Input Connector IJ oooooooooooooooooooooooo oooooooooooooooooooooooo oooooooooooooooooooooooo oooooooooooooooooooooooo oooooooooooooooooooooooo ooo oooooooooooooooooooooooo 00° ooooooooooooooooooooooooooS 00000000000000000000000000^ □ □aaannoaoDaaaDaaaoaaDaa aa Main Mixer (eg. M - 24E) # Connecting the SN-550 to the Channel Insert Jack If you wish to remove hum or noise of a specific channel, connect the SN-550 to the Channel Insen Jack. Mixer (e.g. M - 24E) 9 ■ CONNECTIONS ►Connecting the SN-550 between a mixer and power amplifier If you wish to remove the hum or noise caused by a variable lighting system or computer, or noise picked through a microphone or white noise in the overall system, connect the SN-550 just before the power amplifier. • Connecting the SN-550 to a guitar When you use an effect unit, you can obtain successful results by using the SN-550 twice as shown below. When you use a delay or reverb unit, connect the SN-550 just before it. ( If you connect the SN-550 after the delay or reverb, the reverberation time may be shortened. ) When using a multi-effects unit, connect the SN-550 to the Send/Return Jack and set it so that the delay/reverb will be connected just before the SN-550. In this case, to minimize sound deterioration and maximize the effect, use only the noise canceling function in channel A and both the noise and hum canceling functions in channel B. Input SN-550 tP^Tl nmiiun fp^n HUH1MH ' □ t_t Direct Box (BOSS DI-1) Input B Output A oooo oooo oooo I—I I—I Input Guitar Compresser, Distortion, Equalizer, Chorus etc. Output B :|iQOOO] lOOOOOOMOO c IT Guitar Amplifire (JC-120) Output oooo oooo □ Input Delay, Reverb etc. 10 ■ SETTING The following explains the basic settings of the SN-550. © Switch on the SN-550 and the connected units. Switch on the power amplifier ( or guitar amplifier ) last. (Switch the units off in reverse order.) * This unit is equipped with a circuit protection device. A brief interval after power up is required before the unit will operate. * When the SN-55...