EQP5 Equalizer Frequency Mods

All the frequency bands on the EQP5 Passive EQ can be customized by changing the capacitor value.

LF- Frequencies

Change these caps:

  • C20 for switch in
  • C21 for switch out
Frequency Cap Value
10Hz 150nF
20Hz 82nF
30Hz 39nF
40Hz 27nF
60Hz 18nF
90Hz 10nF
120Hz 8.2nF
150Hz 6.8nF

LF+ Frequencies

Change these caps:

  • C22 for switch in
  • C23 for switch out

*Note that in the LF+ band, C24 is already populated with a 150nF cap which adds 150nF to both C22 and C23. For starred frequencies, 10Hz and 20Hz, C24 needs to be removed.

Frequency Cap Value
10Hz 4.4uF (2.2u + 2.2u)*
20Hz 2.2uF*
40Hz 560n
60Hz 390n
90Hz 150n
120Hz 82n
150Hz None (only the 150nF from C24)

HF- Frequencies

Change these caps:

  • C18/C19 for switch in
  • C17/C17b for switch out 

C18 and C19 are in parallel to achieve 136nF (which is not a regular cap value) for the stock 10kHz frequency. So to customize the "switch in" frequency, remove C19 and change C18 to the value from the chart below.

C17b is just an extra socket in parallel with C17, in case you want to choose an eccentric frequency or set the "switch out" frequency to 10kHz.

Frequency Cap Value
3kHz 330nF
5kHz 220nF
8kHz 150nF
10kHz 136nF (68n + 68n)
12kHz 120nF
15kHz 100nF
18kHz 82nF
20kHz 68nF

HF+ Frequencies

Change these caps:

  • C16/C16b for switch in
  • C15/C15b for switch out

C15b and C16b are extra parallel sockets for C15/C16 for achieving non-standard cap values. For example, if you wanted to make the "switch in" frequency 10kHz, you would place 5nF and 390pF in C16/C16b (doesn't matter which goes where) for a total capacitance of 5.4nF.

Frequency Cap Value
8kHz 8.2nF
10kHz 5.4nF (5n + 390p)
12kHz 3.9nF (3.3n + 560p)
16kHz 2.2n
20kHz 1.4nF (1n + 390p)