Rockbox General > Rockbox General Discussion
shure e2's and e3's on rockbox
soap:
Arj, I believe you are correct on all counts.
It wasn't the Q values which caught my eye (though I get your point), but the gain values.
--- Code: ---eq enabled: on
eq precut: 0
eq band 0 cutoff: 150
eq band 0 q: 10
eq band 0 gain: 0
eq band 1 cutoff: 500
eq band 1 q: 5
eq band 1 gain: -50
eq band 2 cutoff: 1500
eq band 2 q: 8
eq band 2 gain: 0
eq band 3 cutoff: 4000
eq band 3 q: 5
eq band 3 gain: 10
eq band 4 cutoff: 11000
eq band 4 q: 5
eq band 4 gain: 20
--- End code ---
So is that -50dB, or -5.0?
If the former - I find it a bit odd.
If the latter, I can grok it, but that would make the 1.0 gain at 4000 to be a waste of CPU, IMHO.
Arj:
--- Quote from: soap on March 23, 2007, 05:15:09 PM ---Arj, I believe you are correct on all counts.
It wasn't the Q values which caught my eye (though I get your point), but the gain values.
--- Code: ---eq enabled: on
eq precut: 0
eq band 0 cutoff: 150
eq band 0 q: 10
eq band 0 gain: 0
eq band 1 cutoff: 500
eq band 1 q: 5
eq band 1 gain: -50
eq band 2 cutoff: 1500
eq band 2 q: 8
eq band 2 gain: 0
eq band 3 cutoff: 4000
eq band 3 q: 5
eq band 3 gain: 10
eq band 4 cutoff: 11000
eq band 4 q: 5
eq band 4 gain: 20
--- End code ---
So is that -50dB, or -5.0?
If the former - I find it a bit odd.
If the latter, I can grok it, but that would make the 1.0 gain at 4000 to be a waste of CPU, IMHO.
--- End quote ---
In the cfg file, what is listed as -50 is actually -5.0dB. In band 4 that you listed, a gain of 20 is 2.0dB.
But back to the Q values for a minute. I have been playing with that spreadsheet to see how it maps out some of the cfg's I am experimenting with and my Q values, as set from the graphical EQ screen, range from .5 to 1.0. In the .cfg file these are values from 5 to 10. When I put them in the spreadsheet, it turns out they cover a fairly broad range of frequencies and if you have 2 or 3 bands trying to control frequencies that are close together, you get an additive effect. If I graph Nate's setting, for example, he is getting at least a 2dB gain from about 5000Hz and up.
I have been trying to surgically adjust the dips in response on the e2c's high end. One approach has been based on reading the frequency response graph. The other approach has been to use Saratoga's tone method. Anyhow, I am just trying to reconcile what my ears hear with what my head thinks should be happening. Understanding how to use that spreadsheet will help me with that.
Navigation
[0] Message Index
[*] Previous page
Go to full version