Rockbox General > Rockbox General Discussion

The iPod Poor Bass Response

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DefineByte:
Seems I wasn't looking at the graphs properly. I was ignoring the no load part. xD

soap:

--- Quote from: PHK Brasil on March 27, 2007, 11:19:19 PM ---Compensating EQ for 16 Ohm:

Advanced EQ Settings:
Low Shelf Filter -> Cutoff Frequency: 50 Hertz
Low Shelf Filter -> Q: 0.6 Q
Low Shelf Filter -> Gain: 3.0 dB
Peak Filter 1 -> Center Frequency: 20 Hertz
Peak Filter 1 -> Q: 0.5 Q
Peak Filter 1 -> Gain: 0.5 dB

--- End quote ---

Thank you ever so much, this is something I've been long meaning to do, but never gotten around to.
How much do I need to pay beg you for a RMAA graph of the above EQ setting without the .5dB peak filter?
0.5 dB seems like a very small tweak for the extra CPU load, but I'm curious to see the difference.

PHK Brasil:

--- Quote from: Febs on March 28, 2007, 07:19:33 AM ---For sub-32 Ohm loads, the graphs clearly show a problem, but for higher loads, it looks much less significant.  The bass attenuation at 50Hz for a 32 Ohm load is less than half a dB at 50Hz and 1dB at 30Hz.  I'm not sure that would be audible.
--- End quote ---

Yes, I agree. I just mentioned "Is not just a sub 32 Ohm problem", cause once I read that someone is adding resistors to their headphones till they reach 33 Ohm, thinking to solve the problem this way. Or someone thinking that a Shure E500PTH is totally free from this, cause has 36 Ohm impedance.
But, there's not a miraculous cure in 33 Ohm.


Before all of this, I did tests (with music) adding a pot in my Apple 32 Ohm earbuds, and I noticed audible changes in the frequency response, as I increasing the impedance. But the pot I used has a much higher value to a detailed test.

But the impression I had, was that not only the bass changed, but from a certain point in ahead, the mid and highs also were changing. But the graphs don't show changes in mids and highs...



--- Quote from: soap on March 28, 2007, 08:09:30 PM ---Thank you ever so much, this is something I've been long meaning to do, but never gotten around to.
How much do I need to pay beg you for a RMAA graph of the above EQ setting without the .5dB peak filter?
0.5 dB seems like a very small tweak for the extra CPU load, but I'm curious to see the difference.
--- End quote ---

soap, the 0.5 dB (in 20Hz!!!!!) is really insignificant. I just focused the graphical change. This was the best graph I got, before I gave up, tired and sleep. I posted this EQ setting, just in respect to the graph.

And if someone wants to use this EQ to compensate, forget about the 0.5 dB peak filter in 20Hz. There's absolutely no audible difference.
♪

saratoga:
Theres some output resistance built into the Ipod, so adding resistance will change the frequency response everywhere, though probably only very, very slightly.  In general, unless you're seeing 2-3+ dB shifts, its basically ok to ignore them.

Jamalarm:
I knew it! I was ranting about this about two months ago when i first switched to an ipod...

Thanks so much for those config compensation thingys.

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