From the manufacturer:
High output mini-humbucker. Great for heavy blues, classic rock, hard rock and metal.
The ceramic bar magnet and hot coil windings give this pickup a more aggressive upper-mid detail than the SM-3, which makes it great for slide and higher output music styles. Comes with four-conductor hookup cable.
Available for both neck and bridge positions. The bridge version is high output. The neck version is compensated for tonal balance. Often, an SM-2b Custom is used in the bridge with an SM-1n Vintage in the neck for versatility.
For balanced and warm instruments. Works especially well with mahogany bodies and rosewood fingerboards.
Brad Whitford / Aerosmith, Robben Ford, Cesar Rosas / Los Lobos
Ethan's picks for best videos/sound-clips:
This video features a Warmoth Telecaster with a Seymour Duncan SM-3 in the neck and an SM-2 in the bridge. Skip to 0:10 to hear the neck pickup on a clean setting; the bridge kicks in at 0:43. The neck pickup (SM-3) has a really warm sound, with deep lows and a clear, detailed midrange. The bridge pickup is similar, yet it has a slightly higher output with a bit more focus in the upper mids. To hear the pickups with some overdrive, listen at 1:00 (neck), 1:15 (both), and 1:25 (bridge). You'll notice that these pickups break up nicely and have a smooth saturation and warmth. There is great detail in the upper frequencies and the lows add great depth to the tone. Add a touch of reverb and you can get some really hollow tones that resonate with beautiful sustain (listen at 1:50). If you're looking for a warm, vintage sound with sparkle and detail, load up your tele with a set of Mini Humbuckers from Seymour Duncan.
The player is Christopher Freedom and he is using a Warmoth Tele through a Laney LC30II and LH50R out to two 212 cabs with a Celestion Vintage 30 and Alnico Blue speakers.