These capacitors form high-pass filters in the receive audio chain. By increasing their capacitance, you lower the cutoff frequency to approximately 80-100 Hz, allowing natural voice fundamentals and low-end richness to pass through.
The standard 48-channel memory can be expanded to 480 channels via an SRAM expansion mod, making it more practical for storing numerous amateur bands and nets. Mode & Audio Upgrades: icom m700 mods