Rockbox General > Rockbox General Discussion
The iPod Poor Bass Response
Llorean:
No CPU cycles doesn't mean No Power though. And the CPU does have an idea about it, because it has to enable and set it.
If a chip does more work (Hardware EQ on) vs less work (Hardware EQ off) it's going to draw more power. You can't ignore thermodynamics, as was stated earlier in this thread. Whether it uses more CPU or not is irrelevant to whether it adds a little to the battery drain.
mamboman:
Okay, I stand corrected. It'd be more clock cycles in the DAC and not the main CPU. Thanks :)
mamboman:
--- Quote from: senab on August 03, 2007, 04:29:20 PM ---No, it won't use ANY CPU cycles because the hardware EQ not implemented in software, the DAC implements it. The CPU, HDD, LCD and every other component have no idea about it lol.
A headphone amp is a viable fixed location solution, but with portability in mind, it doesn't really work ;)
--- End quote ---
Headphone amps does impede some portability, but the portable ones are indeed quite small and they do allow listening for up to 60 hrs with their rechargeable batteries (more than the ipod anyway :) )
TexasRockbox:
In any event, using the Rockbox ipod 5G with 60ohm phones has given me even greater enjoyment of Rockbox/ipod. Battery life is great, I'm enjoying the heck out of my WPS, I'm finally able to utilize OGG as I've been wanting to for some time, not being tied to a program or bloatware to upload/offload music is a joy, and it all sounds great so a big THANKS to the Rockbox developers.
PHK Brasil:
--- Quote from: senab on August 02, 2007, 05:16:45 PM ---@PHK Brasil: Can you outline how you did the test please? Method, equipment, etc, etc.
--- End quote ---
♪
Hi, Senab. The RMAA is very intuitive and simple to use. It will generate 2 audio signals in wave format: A Calibration and a Test signal. Put them on the iPod and run according to the RMAA wizard.
You will need a stereo headphone splitter. One stereo out goes to your PC line in. The other one is where you must plug the headphone which impedance you want to test.
1) Do the measurement with no headphone (No Load) and no EQ
2) Do the measurement with the headphone(XX ohm) and no EQ
3) Now, measure with the headphone(XX ohm) and the EQ
OK?
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