Icom IC-7000 Manual page 12

The serial capacitor C30 is responsible for the bass roll-off, and 0,22 F is in my opinion the
best value. This value also works great for FM-mode. Decreasing it any further will cut away
too much bass and it will make the HM-151 sound very thin and weak (with decreased
output).
The original size of the C30 capacitor is 1 F, and this is a bigger value than in any other
icom hand microphone I know of. This is why it will allow a lot of bass to pass through, and
this is why it will sound "bassy" compared to other icom hand mics.
First, you must get your hands on the replacement capacitor.
The C30 capacitor should be replaced with a 0,22 F SMD ceramic capacitor called
C3216X7R1H224K. Size/type is 3216 or 1206 (3,2 x 1,6 mm). (also named
C1206C224K5RAC C-7025) ELFA part number : 65-777-04
Replace the C30 capacitor. It is a bipolar capacitor, so there is no + or - on it. Please be
aware of the fact that soldering such tiny SMD components are VERY difficult, if you don't