Top Panel Adjustments
L
ev
el
Freq
L
ev
el
Freq
Freq
Freq
L
ev
el
Freq
Freq
L
ev
el
Freq
Freq
L
ev
el
L
ev
el
L
ev
el
L
ev
el
CH1/2
IN
CH3/4
IN
CH5/6
IN
CH7/8
IN
CH1/2
CH1+3
CH2+4
GAIN
GAIN
GAIN
GAIN
CH1+3+5
CH2+4+6
CH1+3+5+7
CH2+4+6+8
HP
BP+HP
BP+BP+HP
Full-Range
Tweeter HP
Midrange BP
Midbass BP
Sub LP
CH1/2
OUT
CH3/4
OUT
CH5/6
OUT
CH7/8
OUT
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AUX Gain Adjustment: In systems
using both the link8's main speaker
level and auxiliary inputs, this gain
adjustment is primarily for matching
the AUX output level with that of
the main source. It is recommended
to set the speaker level input gain(s)
first, particularly if summing.
CH1/2, CH3/4, CH5/6, CH7/8 Gain Adjustments: These gain adjustments are for matching each pair of
output channels’ signal level with the source’s maximum unclipped signal range and the maximum
input capability of connected amplifier(s). When summing channels together, these gain adjustments
should be used for matching relative output levels so that the combined signals sum to as close to flat
as possible. If a gain difference between channels is desired with direct signal input, adjustments
made at the link8 should also minimize amplifier gain settings for best S/N. Note that the gain
adjustment will be bypassed if its input select is set to copy the previous channel pair.
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Clipping Indicators: These yellow LEDs indicate when the output signal from each channel pair is at
maximum level before clipping (distortion) occurs, whether the source is main speaker level or AUX
input. Each will be dimly lit at onset of clipping, and full bright under hard clipping. If the connected
amplifier(s) input can handle full 10Vrms output from the link8, then the gain is set correctly when
source unit is at its maximum unclipped volume and this LED is just starting to flicker. It is likely,
however, that gain will need to be reduced to match your amplifier’s maximum input capability or
optimize source volume range.
CH3/4, CH5/6, CH7/8 Input Select: These 3-position switches are for selecting which signal is routed
internally to each channel pair’s output stage. It provides for 2-channel, 4-channel, 6-channel or 8-
channel input, as well as various independent and summed input configurations:
Copy: In the left switch position, this input setting will copy the internal signal from after the
previous channel pair’s gain stage and route to its outputs. This bypasses the gain adjustment so
its outputs are controlled by the previous channel pair’s gain. If independent gain is desired, use
jumper wires at the speaker input terminals and select direct input instead.
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Direct: In the middle switch position, this input setting will route the channel pair’s input signal
directly to its gain and output stages.
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Sum: In the right switch position, this input setting will sum the indicated channel internal signals
from after their respective gain stages and route the combined signals to its left and right RCA
outputs. For example, if CH3/4’s input select is set to CH1+3/2+4, CH1+3 will be sent to the CH3(L)
output, and CH2+4 will be sent to the CH4(R) output. For vehicles without an available full-range
signal, this function can be used to sum pre-filtered signals together to create a useable frequency
range output from up to a 4-way factory system. Note that although CH1/2’s output is always
passed through, it’s frequency content may still be useable. Additionally, when a front signal is
input, summed or copied to CH5/6 and a rear signal is input to CH7/8 (or vise versa), selecting
CH5+7/CH6+8 can be used to ensure CH7/8’s output will always retain at least half signal level
(Never-Zero) for a subwoofer, regardless of the source unit’s fader position.
Example: 4-way Summing Signal Flow
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