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SUBSONIC FILTER (option)
The GKPX-14 can be equipped with a permanently engaged Subsonic Filter Board
(ordered separately). Note: This board is NOT suitable for Electric Bass or if you de-
tune your guitar to below C2 on the thickest E-string.
The filter will improve:
- PCM Tracking and ghost note immunity
- COSM Tracking and ghost note immunity
- Lower noise when Palm muting at bridge
The effect is most noted on GR-55, VG-99 with Piezo guitars.
The Subsonic Filter consists of six filters (one for each string), eliminating rumble and
low frequency noise. The High-Pass filters remove frequencies below:
50Hz (string E and A),
75Hz (string D and G)
100Hz (string B and High E)
1,2
C2 D2 E2
1,1
1
0,9
0,8
0,7
0,6
0,5
0,4
0,3
0,2
0,1
0
0
50
Installation procedure:
4. Unscrew the bottom four larger Phillip screws and lift the top of.
5. Locate and remove the six red jumpers from the jumper pins.
6. Carefully fit the board so the female connector fits the jumper pins.
7. Fit the two supplied supporting nuts to hold the board in place.
8. Assemble the box and put back the Phillips screws.
GKPX-14
Masured Subsonic Filter Characteristics
G2 A2
C3 D3
F3
G3
100
150
200
GK Parallel Box
A3
B3
250
300
STR1 - High E
STR2 (H)
STR3 (G)
STR4 (D)
STR5 (A)
STR6 (Low E)
350
400
12
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