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Topic: Active and passive pickups, What's the difference?< Next Oldest | Next Newest >
Jammer Offline




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Posted: June 03 2004, 16:41

Just a quick techie question:

What is the difference between active and passive guitar pickups? I know that active ones require external power usually in the form of a 9v battery, but what difference in sound quality do they have to more common passive ones? I am guessing active pickups are overall more advanced judging by the relative guitar prices that come with these pickups
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Korgscrew Offline




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Posted: June 03 2004, 19:47

Active pickups have less coils of wire on them, and use an on-board preamp to boost the level. The lower number of coils gives a low impedance and a clearer sound - they tend to be more 'hifi' sounding. The preamp can be used by the manufacturer to tailor the sound of the pickup more precisely than would be possible than the variations in passive pickup design would allow and can help reduce noise.

Having a battery on-board doesn't automatically signify that the pickups are active - it is possible to have passive pickups together with active electronics. An example that's often given is the Eric Clapton signature Strat - it has passive pickups, but an active mid boost circuit.
It's common to build bass guitars with active tone controls (which allow boosting and cutting of frequencies, rather than just the cutting which passive tone controls provide) - these are sometimes combined with passive pickups (like I've seen some 'active' basses with EMG Select pickups...it makes a great selling point, to say 'active bass with EMG pickups' as EMG are well known for their active pickups, but in fact the Select line are passive...they've just put in an active EQ circuit. It works perfectly well, but it's not the same as having active pickups).

It's certainly a more advanced way of doing things, but not necessarily better - whether you like the resulting sound is a case of personal preference. Most guitarists tend to prefer the warmer, less defined sound of passive pickups, whereas active pickups are quite popular amongst bassists for their clear, hifi sound. Heavy metal guitarists quite like active pickups for their high output and low noise, and their highly defined sound - it all helps when playing with heavily distorted sounds (with the high output helping to achieve the distortion).
Try both and see which you prefer...you may of course discover you like both...
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Satyagraha Offline




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Posted: June 04 2004, 06:14

Quote
Most guitarists tend to prefer the warmer, less defined sound of passive pickups, whereas active pickups are quite popular amongst bassists for their clear, hifi sound.


Exactly so. In my opinion, tradiotional active guitar pickups just won't give you that midrangey, British rock sound, no matter how much you tweak and boost and cut. They won't growl, they're always to refined. But for massive metal distortion and heavily modulated clean sounds, they're the best, because they still cut through and stay dead silent.

However, some active pickups, like the EMG SV line, are modelled to mimic the sound and response of traditional Stratocaster single-coils (without all the noise and hum, of course). I haven't tried them, but in theory, you'll get the best of both worlds with these, just boost the mids and bass for traditional active sounds.

By the way, the bassist in my band has an expensive Yamaha active bass. Some weeks ago, we recorded four songs in a high-end studio. He ended up using the in-house Fender Jazz bass on the rockier songs, and it just worked so much better. The upper midrange growl and graininess of the passive bass pickups somehow sat much better in the mix.


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Jammer Offline




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Posted: June 04 2004, 15:24

Thanks very much for your help. I asked this because while looking for a bass, I found one that I liked the specs of - the Vintage 940B (see http://www.jhs.co.uk/vintagebass.html for info)

Checking it again it most likely has active circuitry allowing for control over tone. With a combination of reverse P and J type pickups, creating a bright tone (which is what I'm primarily after) might not be too much of a problem. I found it going new on ebay for a cheap price - less than is listed, but I think I'll take your advice and try out what my local music shops have to offer so that I get practical experience of the differences
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Korgscrew Offline




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Posted: June 04 2004, 17:50

I've seen those in shops, they seem quite decently made, though I've not played one.

I would say that it pretty much definitely has passive pickups with active EQ - as I said before, nothing wrong with that, it's just not the same as having active pickups. You'll still find that it has a different sound to passive basses, and the on-board EQ circuit is useful for quick changes on stage. It'll certainly help you get a bright sound.

One thing which concerns me slightly about that design is the position of the bridge pickup - it seems awfully close to the bridge to me, which could give it an overly bright sound. It would still be useful for mixing in with the sound of the P Bass pickup to add a little variation (and would no doubt certainly add some bite), but might not be so much use on its own. That said, if you're after a bright tone, it might be just what you want!
Not all bassists like to use the bridge pickup on its own anyway - I do sometimes, and like to have a fairly chunky sound to cut through the mix yet retain low end punch, so I'd be wary of anything that sounds too thin myself.
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Yuval Offline




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Posted: June 20 2004, 10:55

Does the 'HiFi' term refering to a low mid frequency sound???
what does it mean then?
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