Active/Passive Retro-Fit for P-Style Basses
• ACCESS FOR INTERNAL SETTINGS
The internal switches and trimmer, which set up the Deep parameters, are positioned in order that they are accessible
when the strings are in place.
• Refit the pickguard screws except the 6 on the ‘control tail’ surrounding the jack and controls. Tighten the other
screws but not so they are fully down. Make sure they still allow the pickguard some movement, leaving the other 6
out for now. Gently lift up the ‘control tail’ to confirm access to the switches and trimmer.
• Refit the strings, plug the bass in and tune up.
Test the full functionality of the P-Retro before fine-tuning the internal settings.
• On the Volume/Tone stack, push the upper knob down for the passive mode.
• Turn the upper knob Volume up and down to confirm its fully functional, and then check the lower knob, Passive Tone,
leaving it fully CW.
• Make sure the P-Retro Active upper knob is in its down setting and in its centre click.
• Pull up the Volume knob and there should be a slight increase in level. The frequency response is flat and the pickup
is buffered by the Class A FET input stage, so there is a low impedance drive to the jack lead, which can help to give
increased clarity and depth to your sound.
• Pull the the upper knob of the Active stack to check the Deep Boost setting. The factory default setting is +6dB @
60Hz. Adjustments will be described later in this section. Once checked, push the knob down again.
• Rotate the upper Active knob CW for mid boost, and check that the lower Frequency knob varies the mid frequency.
• Rotate upper knob ACW for combined bass/treble boost, again setting the spectrum with the lower Frequency knob.
• Once tested, return the upper knob to its centre click.
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2
ON
1
ON
ON
1
1
2
2
2
ON
1
ON
1
ON
1
2
2
2
ON
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ON
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ON
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2
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DEEP BOOST Frequency Settings
40Hz
60Hz
2
1
ON
1
ON
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ON
2
2
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ON
1
ON
1
ON
12
2
80Hz
100Hz
DEEP BOOST Level
ON
2
ON
1
1
ON
12
2
Trim 2 & +12dB
BRIGHT ON
Set Switch 2 ON