3
3. Front Panel
1
2
3
4
5
6
GAIN CONTROL
The GAIN control is available on both the left and the right channel. It adjusts the input drive of that audio
channel. Unity gain is about the seventh marking, or 1 o'clock. (This is not an absolute, the user should
adjust the gain controls when the Limiter is active, by reading the level on each meter.) Limiting usually
requires some additional "make-up" gain to compare IN / BYPASS.
REDUCTION CONTROL
Each channel has a REDUCTION control. REDUCTION adjusts the amount of limiting or compression in that
channel. This could also be called "threshold". Turning this control clockwise increases the amount of
limiting or compression.
VU METER
There is a VU Meter for each channel in the ELOP+. It shows the amount of gain reduction in dB from the 0
dB mark, when the switch (7) is not selected, set to REDUCTION. When the switch labeled (7), is selected to
O/P and illuminated, the meter measures the output level in decibels.
Note: VU meters and PEAK meters rarely agree, digital recorders usually use peak meters - Rely on those for
a clean recording. VU meters are standard with analog tape machines and big consoles because they
correspond well with perceived loudness.
HP SC CONTROL
The High Pass Side Chain filter is factory set to 80Hz. When this switch is engaged and illuminated,
everything above 80Hz will drive the limiting or compression action. This is useful if you want the bass to
come through with full impact and limit or compress everything else. Also if you don’t want the kick drum or
bass line driving the whole compressor action, engage this switch. This filter frequency may be set to a
slightly higher frequency of 150Hz by changing the internal HPSC filter select jumper W1 & W2 for each
channel, located on the front panel PCB. (Consult Chapter 8, Servicing and refer to diagram 3)
IN / BYPASS CONTROL
This switch will disengage the active dynamic control section of the unit. If the switch is engaged and
illuminated to the “IN” position the audio will pass through either the whole unit and all the front panel
controls will function. When this switch is set to “BYPASS” the audio still flows through the tubes in the unit,
but at Unity Gain. Use this switch to compare the processed sound with the original.
COMPRESS / LIMIT CONTROL
This switch allows the ELOP+ to use two different compression ratios, offering either compression at
approximately 3:1 when the switch is engaged and illuminated or limiting at approximately a 10:1 ratio
.
7
7
Diagram 1
IN
IN
1
2
3
4
4
5
5
6
6
7
9
8
1
2
3
