Samson MDR1688 Benutzerhandbuch

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The following section details each part of the MDR1248 

and MDR1688’s MONO INPUT CHANNELS including the 

GAIN control, LOW CUT switch, 3-BAND EQ, AUX sends, 

PEAK LED, PAN, SOLO, ALT 3/4 bus and LEVEL controls. 

The input channels one through four on the MDR1248 

and on through eight on the MDR1688 feature high 

quality, discrete transistor pre-amps providing transpar-

ency and extended dynamic range.  

The  MDR1248 and MDR1688’s pre-amp stage has a vari-

able GAIN control with a range of 0 to 40dB on the MIC 

input and  –15 to +25dB on the LINE input.   

Each of the MDR1248 and MDR1688’s mono input chan-

nels include a LOW CUT (or high pass) filter which rolls off 

the low frequencies from 75Hz and below at the rate of 

18dB per octave. The LOW CUT filter allows you to remove 

the lower frequencies that you sometime just don’t want 

to pick up. For example, when you are miking a high-hat 

you only want to capture the frequencies that the hi-hat is 

producing. Therefore, by using the LOW CUT filter, you can 

reduce the amount of pick-up from the low toms and bass 

drum that may leak into the hi-hat mic. You can use the 

same technique on other instruments like acoustic guitar, 

violin, piano and even on vocals.  In live sound applica-

tions, the LOW CUT filter is especially useful for removing 

stage rumble.
3 - Channel Equalizer

The MDR1248 and MDR1688 mic/line input channels 

incorporate a 3-band equalizer, with sweepable Mid-

range, allowing you to adjust the high, mid-range, and 

low frequencies independently on each channel. The fre-

quency centers, range of boost or cut, and equalizer type 

for each band are described in the following section.
HF (HIGH FREQUENCY) 12kHz +/- 15dB Shelving type 

The channel’s HIGH frequency response is flat when the 

knob is in the “12:00” position. Rotating the knob towards 

the right will boost the channel's high frequency response 

at 12 kHz by 15dB, and rotating it towards the left will cut 

the high frequency by 15dB. 
MF (MID FREQUENCY) CUT & BOOST

The MID CUT & BOOST knob is used in conjunction with 

the MID FREQUENCY knob to create the tonal shape in 

the mid-range frequency when using the mono channel’s 

equalizers. You can adjust the frequency on the mid-range 

control with the FREQ knob, and use the MF CUT & BOOST 

to either boost or cut that frequency by plus or minus 

15dB. The channel’s MID frequency response is flat when 

the MF knob is in the “12:00” position.
FREQ (MID FREQUENCY) Variable 100Hz – 5K

The MID FREQUENCY is a control enabling you enhanced 

capabilities in the tonal shaping of the input channel 

signal. Thanks to the MID FREQUENCY control, you have 

a variable mid-range equalizer, allowing you to pin point 

the exact frequency you want to boost or cut. The MID 

SWEEP has a “fixed Q” of two octaves (the amount, or 

width, of frequencies around the center point that are 

effected by the MID CUT & BOOST control) and can be set 

in a range from 100Hz to 5Khz. 
LF (LOW FREQUENCY) 80Hz +/- 15dB shelving type

The channel’s LOW frequency response is flat when the 

knob is in the “12:00” position. Rotating the knob towards 

the right will boost the channel's low frequency response 

at 80 Hertz by 15dB, and rotating it towards the left will 

cut the frequency by 15dB.