Seymour Duncan SPB-3 Quarter-Pound for P-Bass

Pickup features: Passive Humbucking
Impedence or other specs: Bah! I don't need no stinking numbers!

Model of guitar or bass: Fender Precision Bass Active
Position: neck
Pickup being replaced: Stock Fender P-Bass Pickup
Other pickups on guitar: Seymour Duncan Quarter Pound for Jazz Bass
Artists using this pickup: Me
You musical style(s): Rock, Emo-core, Progressive Rock
Reason for pickup change: Original preamp for bass had been butchered by the previous owner and the output of the bass just wasn't quite where I wanted it... I pulled this pickup from the Yamaha in which I'd originally installed it and found a MUCH better home.

Perceived output level: Damned hot... the loudest passive out there.
Tone: Warm, full, rich, solid, substantial, heavy, wonderfully thick and resounding. Bass and mids are covered, highs are not the strong point... but part of that is the location.
Sonic evaluation: I play through a GK800rb (preamp out to a dbx rack compressor and a bbe sonic maximizer) into a Bag End S-15 Deep cabinet. It's a bangin' setup and I have to say that the pickup does contribute... definitely a lot of boom to it.
Having had this same pickup in a different bass originally, I can say that it does better in a better constructed bass. The Yamaha is a cheaper model and the pickup definitely made a difference, but the Fender is made of much better wood. This pickup really lets that be known.

For which styles and positions is this pickup (un)suitable: Rock, Emo-core, Progressive Rock

Comments: If you don't want to go active, but want some real kick to your sound, this is your baby. They're worth the money.
I put off buying this pickup for a long time 'cos I was told it was a loud pickup that tended to distort. They lied. This is a loud pickup that, unlike most pickups, just happens to still sound good when you turn it down. Duncan really hit it on this one.
I bought a second one of these on eBay without have a bass into which I can put it. When I bought the Jazz version, I bought a set... you betcha.... it's that good.
The one downside to this pickup is that if you've got another pickup in the bass, you'll probably have to change it: the Quarter Pounder is louder than other passive pickups and when you try to run it in parallel with the common jazz pickup, the volume drops to the level of the jazz or lower. This was a problem with the original Fender I left in and with the Lace Sensor I replaced it with. At first I thought it to be a polarity issue: nope.
All problems were solved when I put in the QP for Jazz... they are meant to work together. Where the P has the boom and warmth, the jazz has the highs and adds punch. Of the two, the P gives about 70%-80% of the real sound. The J is an accent, but it really does help a great deal.

Pickup features: Split Humbucking Passive
Impedence or other specs:

Model of guitar or bass: Japanese Fender P-Bass
Position: middle
Pickup being replaced: Standard issue Japanese p/u
Other pickups on guitar: none
Artists using this pickup: Me and lots others
You musical style(s): Rock, Prog Rock, etc.
Reason for pickup change: I bought this Japanese Fender P-Bass to replace a much more expensive P-Bass Lyte that was stolen. I could tell that the instrument was good by how it sounded unplugged, but when I plugged it in, the electronics were really bad. I knew some other players who raved about the SD QP so I decided to try it. Knowing that the tone and volume pots were cheap and bad, I by-passed them entirely, wiring the output of the p/u straight to the output jack. I LOVE this setup!

Perceived output level: A bit louder but not as hot as active p/us
Tone: Absolutely sweet, even across the spectrum, harmonics sing, low notes loosten bowels.
Sonic evaluation: These p/u's made a cheap, crappy bass sound pro. I run it through an SWR Studio 220 into a Gauss 2x10. It slams!

For which styles and positions is this pickup (un)suitable: I play rock, prog rock, alt rock... I'd use this p/u for any style... good is good!

Comments: I'd gladly get the same set-up again! In fact, I'm considering swapping the Bartolini's in my Jazz Bass with SD QP's.

Pickup features: a standard p. bass pickup 2 dominos 4 poles per dominos wired together.
Impedence or other specs: passive humbucker

Model of guitar or bass: a ash body on with a warmoth jazz neck,rosewood fretboard.
Position: middle
Pickup being replaced: all part p.bass
Other pickups on guitar: NA
Artists using this pickup: Steve Harris of Iron Madien
You musical style(s): classic rock,r&b,blues
Reason for pickup change: the pickup route was so far off the neck and bridge that not 1 dam string lined up.The G is right in the middle of the 2 pole possion so it was not even amplfied!

Perceived output level: any thing had to be better.I love there hot p.bass pickups.
Tone: warm as a summer day in the 90's.smooth as a cold beer on that summer day.
Sonic evaluation: a 100 watt tube head from the 70's,with a 4-12 ev loaded cab.with flat wound strings and a badass 2 bridge.I have been useing duncans for years see my review for there hot p.bass pickups.

For which styles and positions is this pickup (un)suitable: classic rock,r&b,blues

Comments: I got the guitar for $25.00,I chosse the duncans because I thought that with those huge poles on them that the pickups might line up under the strings better.after I put the pickups in,added the badass bridge and put on flatwounds.I got the shock off my life.I hoped that maybe It would liven up, it did but with those flat wound and rose wood fretboard
I ended up with the warmest bass I have ever owned!It is very close to that orgional 62 precision I've longed to own but could never afford.I was stuned,people keep asking to use it to record with.There is no way in hell or on earth. I will every be able to get a fluke thing like this to duplicated it self again.I love duncans they can really make shit turn into gold!