veff: If you want to be able to switch between Q-Tone enabled and disabled, you can employ a push-pull pot.
1 Kudos
Q filter What does it do, exactly?
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 nocaster |
Re: Q filter What does it do, exactly? | #41 | ||
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Posts: 19369 Thu, Oct 31, 2002 08:01:41 The Big FIBer |
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Madzub |
Q-filter mod | #42 | ||
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Posts: 2 Tue, Nov 12, 2002 02:07:48 |
I`m in the process of modding my guitar, and one of the changes is adding a Q-filter. As for the resistor value, I am using two 500K pots, one with a 3.5k resistor and the other with a 28K ohm resistor. I figure this way I can balance the two pots to get just the right amount of low frequency, depending what pickup combo I`m using. And I`m using 3 very different pickups, so assuming this works, it should work well.
Bill, if you read this, do you see any potential problems with this? I`ll post my sonic evaluation when its done, in about a week. btw, the schematic I`m using gives me 32 different pickup combinations, plus the q-filter. This guitar will be a bottomless cup of new sounds..... |
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Madzub |
... | #43 | ||
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Posts: 2 Tue, Nov 12, 2002 02:28:26 |
also I was wondering, what happens when the Q-filter is wired in series with a pickup?
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datoyminaytah |
Schematic | #44 | ||
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Posts: 104 Tue, Dec 3, 2002 21:39:02 |
> ...a 1 henry, low Q noisefree inductor in series with a .02 micro farad cap in parallel with an 8 kilo ohm resistor...
So, that's like:
Legend: ///// = inductor, /\/\/ = resistor, || = capacitor Is that what it is? Can anyone confirm it? |
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sorenrv |
Re: Q-filter, subjective description | #45 | ||
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Posts: 68 Thu, Dec 12, 2002 11:16:15 |
Hi
After having used the Q-filter for a few weeks now with an L-500C here is my subjective description of what it does to the tone. [Nocaster, since this is a permanent, top priority thread, you are welcome to delete this post if you don't find that it qualifies to be permanent] Most humbuckers have a very pronounced midrange. What the Q-filter does, is to "clean this up", which is why some people describe it as changing the humbucker sound to something more single coil-ish. My ears tell me that what goes on is this: The filter cuts, by a fixed amount, a selectable frequency range within the midrange to lower midrange frequency register. If you imagine having a parametric equalizer where the Q pot (the width of the frequency range) and the boost/cut pot (the amount of boost/cut, in this case the cut) set to fixed values but the frequency pot being variable within the midrange register, that is pretty much what the Q-filter does. Kind regards, Soren |
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hollytiger |
Re: Q-filter, subjective description | #46 | ||
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Posts: 14 Sun, Apr 27, 2003 01:35:09 |
I have a question, can you actually wire it up to increase Impedence (while keeping the ability to use a pot) as opposed to reducing impedence? I would assume if I were to reverse the polarity of the inductor it would work the other way? I may consider something like this for my strat (with BL's and a Duncan) while I'm definetly getting dual hums and wiring up for cutting impedance\a given frequency. By the way, couldn't I technically use like say, a 25K pot and replace the resistor and have myself a parametric EQ? That would be cool!
BTW, what the physics guy said, yes, it's basically a notch-filter, I suppose only me, a 17 year-old or a 70 something guy named Bill Lawrence could tell you.  You'd be surprised how good I am with electronics. ~Holly
The Middlefield, OH Diva Visit my website: www.thetwoofus.cjb.net |
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nocaster |
Re: Q-filter, subjective description | #47 | ||
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Posts: 19369 Mon, Apr 28, 2003 04:23:13 The Big FIBer |
This does not match my understanding, but that doesn't necessarily mean much.
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dbc |
Q-filter with 490's | #48 | ||
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Posts: 18 Tue, May 27, 2003 20:05:46 |
"...IMO it doesn't work too well with the 490s. But with the 450, 465, 500 and 280/290 it's got a stunning effect..."
Anybody else have this experience, or any explanation? I've got a set of 490's (which I love) and am considering a Q-Filter...wondering what I should expect. Also, any comments on how the filter works with a middle position pickup? (thanks, I'm new here and new to Bill's pickups...also recently got a 280TL and I'm a convert!) 
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nocaster |
Re: Q-filter with 490's | #49 | ||
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Posts: 19369 Wed, May 28, 2003 04:58:11 The Big FIBer |
The Q-Filter facilitates greater *tonal* variation on the hotter and fatter pups. Increased output expands the frequency range that the Q-Filter can work on, thus facilitating more tonal variation. With other pups it acts more like just taking turns off with less tonal variation. And the middle pup is no different to any other, but bridge pups usually being hotter have more to offer. You really need to take the time to read this thread.
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dbc |
Re: Q-filter with 490's | #50 | ||
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Posts: 18 Wed, May 28, 2003 15:22:52 |
Thanks for the input; I've read the whole thread and that was my understanding regarding the advantage of using the filter with higher output pu's; but I was thrown that the post I referenced specifically included the 280's, 290's, and 450's as producing a "stunning effect" with the Q-filter, and that "it doesn't work too well with the 490's"...I wasn't under the impression that the aforementioned were hotter than the 490's, so I'm wondering if there are other characteristics to this pickup which make it less compatible.
Regarding neck vs. bridge vs. middle, it seemed like Bill's description detailed somewhat disparate functional uses between using the filter on the neck and bridge pu's. I guess the main thing I'm wondering is how much of that faux-acoustic sound I could get with the filter only wired to the middle pu. (PS, To tie this all together: I'm thinking about using my 490's in the neck and bridge positions of a new guitar I'm planning to build, and putting a 450, 290, or 465 in the middle w/Q-filter, mainly for slide sounds (and acoustic-faking when necessary). Either that or I'll just stick with the 2x490's with the Q-filter, if I think that'll cover all the ground I want.) |
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nocaster |
Re: Q-filter with 490's | #51 | ||
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Posts: 19369 Thu, May 29, 2003 04:41:45 The Big FIBer |
The quote you gave is from fuzzy beard who is extremely well versed in Bill's pups.
I wouldn't personally bother with a Q-Filter with 490's, except maybe with a 490XL in the bridge. YMMV. For faux-acoustic tone, I think you'd want the greater string vibration at the neck, but the middle may also work well enough. A 280 neck or 450 neck would probably be the best bet for achieving the most realistic faux-acoustic tones, remembering that you need to go thru an acoustic rig, and from my reading of Bill's info, you need to specifically wire the Q-Filter for this function. I suggest the following three combos for your consideration- 1) 495L / 450A-16 2) 495L / 490CN 3) 495L36 / 280SM / 490N24 or 490CN24 All that said, I really think you should talk to Bill himself to be assured of getting what you want, and obtaining a custom wirogram for achieving it. |
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Prophete De Cheese |
Re: Q-filter with 490's | #52 | ||
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Posts: 12 Wed, Oct 15, 2003 07:00:52 |
Out of curiosity, can the Q-Filter be used on non-Bill Lawrence and even EMG pickups? Just wondering.
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nocaster |
Re: Q-filter with 490's | #53 | ||
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Posts: 19369 Thu, Oct 16, 2003 02:42:34 The Big FIBer |
Can be used with all passive setups. However, I'll stress again that it has greater effect with some pups than others, even within the BL range.
Aide toi et le ciel taidera (Aid thyself and heaven will aid thee) |
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Prophete De Cheese |
Re: Q-filter with 490's | #54 | ||
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Posts: 12 Thu, Oct 16, 2003 11:16:06 |
All passive pickups? I see. Thank you. Does it work with actives at all?
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nocaster |
Re: Q-filter with 490's | #55 | ||
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Posts: 19369 Thu, Oct 16, 2003 23:52:23 The Big FIBer |
It's a passive device. There are active equivalents out there. PeteMK1 is the person to ask, but please ask in-forum.
Aide toi et le ciel taidera (Aid thyself and heaven will aid thee) |
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ESP500XL |
Re: Q filter What does it do, exactly? | #56 | ||
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Posts: 35 Wed, Feb 11, 2004 04:54:23 |
I play shred, would a Q filter be worth getting?
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dirtyharry |
what does the eq filter actually do? | #57 | ||
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Posts: 1 Sat, Feb 14, 2004 01:00:22 |
If i was to invest in the q-filter does it replace the tone pot or do I still need a tone pot in the wiring? Will it fit in a Ibanez rx serious,removable picguard?
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nocaster |
Re: what does the eq filter actually do? | #58 | ||
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Posts: 19369 Mon, Feb 16, 2004 07:53:28 The Big FIBer |
> "I play shred, would a Q filter be worth getting?"
Only you can answer that. > "If i was to invest in the q-filter does it replace the tone pot or do I still need a tone pot in the wiring?" It is wired to a std audio taper tone pot. You could also employ a push-pull pot or toggle switch, so that you can have both std tone and Q-Tone. Btw, Q-Tone on 10 is the same as a std tone pot on 10, but the rest of the sweep is different. > "Will it fit in a Ibanez rx serious,removable picguard?" IIRC, the current version is similar in size to a 9V battery. Aide toi et le ciel taidera (Aid thyself and heaven will aid thee) |
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Prophete De Cheese |
Re: what does the eq filter actually do? | #59 | ||
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Posts: 12 Sun, Feb 22, 2004 13:45:36 |
Can I have a volume pot that works like a normal volume pot but when I pull up on the pot I can use the Q-Filter?
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nocaster |
Re: what does the eq filter actually do? | #60 | ||
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Posts: 19369 Sun, Feb 22, 2004 13:58:32 The Big FIBer |
The Q-Filter is an inline tone shaper, but you could activate a tone pot as a Q-Tone by pulling on a pull-push volume pot.
Aide toi et le ciel taidera (Aid thyself and heaven will aid thee) |
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