Kaskode One Rev 1.1
14
1.9
Subsonic Filter
The Kaskode One has a selectable subsonic filter to help remove any unwanted subsonic noise or
rumble due to warped records and other low frequency mechanical noise. This is in accordance
with the 1976 IEC Amendment for the RIAA equalization curve during playback. This is a 6dB slope
filter placed at 7950uS or approximately 20Hz.
It is generally a good idea to use this filter so that inaudible low frequency noise is not passed to
components downstream, consuming amplifier headroom and shifting the DC operating point of
both the electronics and the speakers.
The filter is selected by installing or removing jumpers J3 and J4 on the main PCB.
J3/J4 Installed = No Subsonic Filter
J3/J4 Removed = Subsonic Filter Active
The figure below shows the location of jumper J3 and J4.
Note that the subsonic filter jumpers
are from the factory, enabling the filter.
Figure 7: Location of J3/J4 subsonic filter jumpers
