Get the guaranteed best price on 4 String Electric Bass like the Spector forte 4X Electric Bass Guitar at Musician's Friend. Get a low price and free shipping on thousands of items.5/5(1). The Spector Forte series was developed to bring the essence of what is their USA Series Basses to a price point that is greatly reduced from their other Neck-Thru USA models. The Spector Forte-4 bass is powered by active EMG Pickups and the Aguilar OBP-2 Tone Circuit.5/5(1). Oct 10, · I am selling my US Spector Forte 4. I am the original owner and this bass has been extremely well taken care of. There are no scratches, dings or dents. There is a small shiny area in the matte finish just above the P pickup from my thumb. I've upgraded the preamp to a Darkglass Tone Capsule and added a Hipshot D tuner.