If the frequencies are close, adjacent bands will interact a little. Usually at least 2 op amps are used, one for odd bands and one for even bands (like the Klark Teknik DN27). But for better separation, more stages may be required (the UREI 527 uses 4 op amps each handling every fourth band).Gold said:I'm kind of surprised there aren't more graphic EQ's around here. A classic "swinging input" topology only uses a single opamp for all bands. It seems well suited for a DOA since you only need one.
For tracking, the issue is that a decent graphic EQ cannot be put in each channel.Gold said:I'm kind of surprised there aren't more graphic EQ's around here.
This is true only if is made use of real inductor-based resonant tanks; when "gyrators" are used, their noise add significantly, and yes, the noise contribution increases when a band is cut, as much as when it's boosted.A classic "swinging input" topology only uses a single opamp for all bands. It seems well suited for a DOA since you only need one.
abbey road d enfer said:For tracking, the issue is that a decent graphic EQ cannot be put in each channel.
Since real inductors are no more commercially viable, there are only two types of GEQ's commonly available, those that use the swinging input topology with so-called gyrators, and those that use the cascaded Baxendall-derived structure, where there are as many sections as there are bands.
Anyway, GEQ's are steadily losing favour since most digital mixers have some kind of rather efficient parametric EQ built-in; statistically, GEQ's are for old geezers who have not made the transition.
I would think no one is actually losing hairs over designing the best GEQ in the universe...
I was not aware of the Sphere but I remember a similar product, don't remember the brand, that was almost unusable as the contacts got scratchy. These pushwheel switches are not designed to withstand the rigours of a studio; they are more or less "set and forget".Gold said:The exception to that rule is the Sphere 900. It used paddle activated rotary switches for for each band.
I may be wrong but i'm convinced I saw a QE console with cassette-sized graphics; they may have been 3rd-party.The QE712 used full sized faders.
There have been some threads around here about DIYing inductors. Very often I think people are timid, thinking inductors have some kind of magic that is not accessible to them; I believe most people who make inductors and transformers are guilty of impregnating their business with so much mystique.Coils are popular around these parts. I was surprised not to see more DIY projects.
Not for me... Well, except if I had nothing else.I'd say the average DIY'er would find good use from a pair of really nice five to eight band GEQ for general shaping.
Definitely.I agree that a semi parametric is more useful in a console strip.
abbey road d enfer said:I was not aware of the Sphere but I remember a similar product, don't remember the brand, that was almost unusable as the contacts got scratchy. These pushwheel switches are not designed to withstand the rigours of a studio; they are more or less "set and forget".
I may be wrong but i'm convinced I saw a QE console with cassette-sized graphics; they may have been 3rd-party.
There have been some threads around here about DIYing inductors. Very often I think people are timid, thinking inductors have some kind of magic that is not accessible to them; I believe most people who make inductors and transformers are guilty of impregnating their business with so much mystique.
But my comment was not limited to studios, it's a serious trend in live sound too. There are many gigs where there is no graphic, often they are not in riders. Some SE's have developed a hate of graphics that I find unjustified. It's bad usage that gives them bad reputation; if they had learnt how to use them, they would at least accept them, maybe love them, but now that learning the trade is posting on GS, what can you expect?
Agreed. But there was a time where it was the only tool available. They're good for room EQ, though, provided the user knows what he does.Gold said:They are a crude tool for feedback suppression.
For monitors, yes. For FOH, they as much pros than cons; one could be drowning in trying to get a perfect ruler-straight response and forget to do the gig!I'd much rather have one of these modern digital crossovers with parametric notch filters.
abbey road d enfer said:For monitors, yes. For FOH, they as much pros than cons; one could be drowning in trying to get a perfect ruler-straight response and forget to do the gig!
Yes, but as I said, when a graphic is all you have...Gold said:I was talking about feedback suppression. A 31 band graphic rarely has the frequency point you need.
Indeed! That's the common mistake that many make, and blame the equipment.Ruler straight frequency response is overrated.
Any graphic will boost or dip a bunch of frequencies around a nominal center point, so any graphic will work to reduce feedback modes. A 1/3rd oct (31 Band) will trash less nearby frequencies than 2/3 oct or full octave.Gold said:I was talking about feedback suppression. A 31 band graphic rarely has the frequency point you need. Ruler straight frequency response is overrated.
Amazingly I just came across this from random Googleing:sr1200 said:are you aware of replacement faders for the 535? A guy by me is selling a couple of them for a pretty decent price. Was just looking at them today. One has a fader that is non functional the rest seem like they may just need a good deoxit bath (not literally).
sr1200 said:Helter,
are you aware of replacement faders for the 535? A guy by me is selling a couple of them for a pretty decent price. Was just looking at them today. One has a fader that is non functional the rest seem like they may just need a good deoxit bath (not literally).
Those are actually toggle switch caps NKK AT4003A. Not a proper part for those faders but they worked pretty well. I would have used the plastic shaft with LED style that that 535 assembly used but the 527A needs 2K pots so my options were limited.sr1200 said:whered you get the little condoms to go on the ends of the fader stems (or whatever they're called).
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