10-3 (sorry, I can't type superscript)
Perhaps, if you're used to looking at smoothed graphs - if it is the unsmoothed plot of speaker I wouldn't consider it particularly bad?
Exactly. Seeing unsmoothed response that is *mostly* ±5dB across the operating bandwidth is not too bad, especially for a brand/model that most gear snobs would ignore. Allen, this isn't worth worrying about. I did this over 25 years ago and EQ'd myself into less signal and no net audible improvement. Besides, as has been pointed out, much of your perception of the speaker output will change in situ, so you'll be better off waiting until the speakers are in position, the band is playing, etc.
To expand a little on what Paul said (and making wild assed assumptions to make this example work...), lets say you looked at that graph and decided to boost 1k6 on your graphic EQ to try and flatten the response there.The problem is you don't know what's causing that dip there. If the crossover point of the box happens to be around there, then one possible cause for the dip would be a phase (or polarity) difference between the Mid and High drivers, causing cancellation of the acoustic output of the adjacent devices. If that is the case, then that phase/polarity difference will continue to cause cancellations even if you do stick a stronger signal in to the box at those frequencies, so youll be making your amp and drivers work harder to no avail.HTH,David.
Because a 1/3 octave EQ is a pretty bad tool to try and correct a speakers response with, ideally you want the fully adjustable notch and shelving filters found in a DSP processor. But even with that and an RTA display to look at you're not going to get a ruler flat response no matter how many filters you apply, and that's because speaker response is a product of the amplitude and phase response of the drivers and crossover components and how all that interacts with the room it's in, so you simply cannot correct that with an amplitude only device like an EQ... and that's ignoring the phase altering side effects of those EQ filters that you have no control over.
FYI, the standard method for typing "powers" where you can't superscript, is to use a carat.10^1=1010^2=10010^3=1,000...10^10=10,000,000,000At least, that's what I learned in my math & science classes.But if you're posting to this forum, you can encase the superscript text in [ sup ] tags (the "sup" button in the edit window does this); typing the following:Code: [Select]10[sup]4[/sup]=1000gets you 104=1000
Exactly. Seeing unsmoothed response that is *mostly* ±5dB across the operating bandwidth is not too bad, especially for a brand/model that most gear snobs would ignore.
typing the following:Code: [Select]10[sup]4[/sup]=1000gets you 104=1000
Thanks Ivan.So how is the smoothing performed? Is it a rolling average or something similar? It has been my experience that doing any smoothing shifts the curve you are smoothing.In the specs we see on different speakers, is there anywhere we can tell how much smoothing was used?
In the case I presented, it is simply a percentage. The percent is in octave terms-so 100% is 1 octave (the graph with the most smoothing). 33% would be 1/3rd octave.Another way of performing smoothing is to simply use less points in the measurement.And then there is the "marketing smoothing" in which they just simply redraw the graph to be what they want it to be-no matter what the actual measurement is. YES it has been done.Or you can use a wider trace line or change the scale and so forth.OF course in the old days of chart recorders-you just simply change the speed of the chart.I guess the best way to find our for sure would be to look closely at the graph and see if it says-or in some small print or call the manufacturer and see if you could get through to somebody who could give you that information.
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