Check the listing for details. Martin Special GPC All-Solid Grand Performance Acoustic-Electric Guitar Natural. Condition: New. Listed at 899.99 USD. The Martin Special GPC all-solid Grand Performance acoustic-electric guitar provides the resonant tone of solid wood in an amplified package. Constructed with a solid Sitka spruce top and solid sapele back and sides, the Special GPC generates expressive highs, midrange clarity and a punchy low end. When plugged in, the onboard Fishman Sonitone pickup system captures the guitar's acoustic properties and allows for natural-sounding amplification. All-Solid-Wood Construction Resonates The solid Sitka spruce top and sapele back and sides of the Special GPC resonate together to produce a balanced tone with articulation across the frequency spectrum.The Martin Special GPC all-solid Grand Performance acoustic-electric guitar provides the resonant tone of solid wood in an amplified package. Constructed with a solid Sitka spruce top and solid sapele back and sides, the Special GPC generates expressive highs, midrange clarity and a punchy low end. When plugged in, the onboard Fishman Sonitone pickup system captures the guitar's acoustic properties and allows for natural-sounding amplification. All-Solid-Wood Construction Resonates The solid Sitka spruce top and sapele back and sides of the Special GPC resonate together to produce a balanced tone with articulation across the frequency spectrum.