The Marsbucker 21 pickup is a high-output pickup with a massive 20.4k output. While it may seem extreme, the M21 still retains the richn and full characters of the M14 and M17, without the compression typically associated with high-output pickups that might limit a guitar's versatility. It focuses on delivering a tight low end similar to the M17 but extends the depth of low frequencies with abundant overtones and clarity across the frequency spectrum. The split-coil mode in the M21 also performs remarkably well, reminiscent of the vintage Telecaster bridge tone, making this high-output pickup versatile beyond the realm of heavy metal.