AG 4M 4-String MusicMan Pickup. The AG 4M pickup recreate the classic Stingray tone while adding all of the characteristics that Aguilar pickups are known for - excellent string-to-string balance, consistency of tone and rich harmonic content. The AG 4M pickup is wired in parallel to give players crisp treble, articulate midrange and thunderous lows. Paired with an onboard preamp, such as Aguilar's OBP-1, 2 or 3, and bassists' will have the ultimate in tonal flexibility.