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Holy carp, have you tried Rockbox's 5G iPod Hardware EQ? - Page 3

post #31 of 121
If someone else could try this on Kruder & Dorfmeisters 'Jazz Master' on K&D Sessions and let me know your findings I'd appreciate it.
post #32 of 121
Quote:
Originally Posted by 1979
Question, a little off topic: I read a Cnet review a while back (yea, they are a little slanted, but still) that rated mp3 players by the quality of a track when tested in mp3, 320 kbps, no EQ and thru a Grado (SR60, I think). According to that list, iPod was the worst of all, and Sony was in the lead, with iAudio and iRiver trailing. My question is, is this software or hardware? Is it the iPod firmware that is causing lower quality (supposedly) that has been fixed thru Rockbox or is it hardware related? I have wanted to buy an old iPod and mod it out with a new hard drive, a new battery and Rockbox but I have been a little worried because quality is always at the top of my list.

Thanks for any help! I hope I am being clear.
Most players uses the same chipseries and the amp is integrated in many of the chips and so on so I can't understand how much it can vary between different players with the same chip anyway. The flash memory based iaudios uses quite cheap sigmatelchips which aren't said to be so awesome, but still they have a reputation for beeing good. They have a bunch of BBE effects which I don't know if they help. Old iRivers on the other hand uses philipschips which are supposed to be good, new iRiver flash based players uses not as good Samsung chips.

Sonys players might be good or not, I don't care, they are crap anyway due to the sonicstage **** software.

Regarding iPods it probably depends on the modell, if I remember correctly for example the shuffle has the same chips as the iAudios so you would suppose they would be similair.

In a technical test I read Samsung YP-5Z was the only player uses sigmatels latest chips which are supposed to be great, and it owned most of the technical aspects, there is some small brand more which uses the same chips and creative will use or have already started to use them.

I think the larger ipods often use telesync chips which also can be found in the iaudio u3 (don't know if it's the same modell thought.)
post #33 of 121
Thread Starter 
The Hardware EQ relies solely on its boost of +12 dB in both the Bass and Treble. By changing them both to 0 dB reverts the SQ back to normal-sounding iPod, which equals major bleh

A late note to everybody: everytime you turn your iPod off, you have to re-pick the Hardware EQ, even if it says it's On, choose it again, and then it'll kick in.

And for the precut in the Software EQ, it's like overclocking; you must find a safe place for all your music where it has deep punchy bass while not distorting. At the moment I have the precut on -10 dB, because on other tracks I can tell hints of distortion.
post #34 of 121
Quote:
Originally Posted by Febs
Just out of curiosity, what happens if:
  • You turn on both the hardware and software EQs,
  • You keep all of the settings on the software EQ flat (zero gain), and
  • You set the "pre-cut" on the software EQ to -12dB,
  • You use the hardware EQ as noted above.
I don't know the answer to this. I have no idea where in the signal path the pre-cut is applied. If it is after the hardware EQ, then this will just result in the same clipping at a lower volume. Otherwise, however, it might be a way to apply large of amounts of gain through the hardware EQ without clipping.
Is the hardware equilizer only valid for 5th generation ipods? or is it accessible for all rockbox players?

I used to to use rockbox on both ipod 4th generation, which is on its way to Vinnie, and iriver 120 and I don't remember seeing something called hardware equalizer. Could someone please clarify?

Also, what does it mean to "set the 'pre-cut' on the software EQ to -12dB" ?

Thanks!
post #35 of 121
Thread Starter 
Yes, the Hardware EQ is currently only for the 5G iPod.

I'm still estatic about the day-and-night change it made to my iPod's original SQ, which now I realize sounds like it's being played underwater and behind a thick curtain.

From what I'm hearing, the pre-cut is like a pre-amp, but...different in a few ways? I can't really clarify it, sorry...
post #36 of 121
Thanks AtheisticFreedom!

Are there any plans of implementing the same feature (hardware equalizer) for ipod 4th generation? Aren't all ipods using Wolfson chip? I know they are not the same exact chip but shouldn't they be similar in that regard?

BTW, when you turn on replaygain on RB, does it mean it can read replaygain from foobar and alike or does it mean that it has its own replaygain software (i.e. like foobar)?

And still looking if someone could explain what "pre-cut" is?

Thanks everyone for your input
post #37 of 121
I'd say precut is more or less a flat cut of all frequencies by some amount of db's, like say dropping the whole level of a song uniformly -10db. You do this so that when you apply +8dB on the bass and +3dB on the highs (for example) it doesn't distort. It's my understanding that subtractive EQ'ing usually results in better sound quality. want more bass and more treble? usually, the best option isn't to boost those frequencies, but rather decrease the midrange.
post #38 of 121
Thread Starter 
1.) Idk why they chose the 5G specifically...you have to ask Febs that one.

2.) The files have to be pre-tagged by something like Foobar, BUT! BIG WARNING HERE! After I ReplayGained'd all my music files, almost half of my files in the iTunes Music folder sometime after that were corrupted and had an underscore (_) at the end of almost every file and folder. Idk what caused this, but...watch out. I spent three hours last night until 3:30 am scrambling to find my back-up music...
post #39 of 121
Quote:
Originally Posted by AtheisticFreedom
2.) The files have to be pre-tagged by something like Foobar, BUT! BIG WARNING HERE! After I ReplayGained'd all my music files, almost half of my files in the iTunes Music folder sometime after that were corrupted and had an underscore (_) at the end of almost every file and folder. Idk what caused this, but...watch out. I spent three hours last night until 3:30 am scrambling to find my back-up music...
it's due to the lack of proper support of id3v2.4 from itunes. foobar sticks to the specifications of the tag format (and is by consequence a better software, at least for me) whereas itunes uses a bunch of dirty hacks (as many other software and dap firmware) to render those tags.

the solution would be to use mp3tag to turn those id3v2.4 tags into id3v2.3, a standard far more supported. but beware, foobar (0.9xxx versions) CAN'T write (but can read) id3v2.3 tags.
post #40 of 121
I'm pretty sure it's 5G only because that's the only iPod to contain the Wolfson chip that supports the hardware EQ? I'm just guessing here, but that's what would make sense to me.
post #41 of 121
Boo hoo, i cant try out hardware EQ yet because i cant complie and i NEED my scrubber support from a older build
post #42 of 121
Quote:
Originally Posted by Febs
There is still skipping if you use CPU-intensive features. These include:
  • Software EQ
  • WPS screens with peakmeters

However, as I noted earlier in this thread, the hardware EQ does not cause skipping. So yes, to that extent, skipping issues have been addressed. There has also been progress made on implementing use of the second core on the PortalPlayer chip. Once this is accomplished, audio will be decoded on on the second core and other functions handled on the first core. This should eliminate skipping issues entirely.

great stuff, will keep my eye on that.
post #43 of 121
I'm getting skipping while simply browsing music while its playing. The battery life is too short to keep Rockbox no matter the sound improvement.
post #44 of 121
Well I saw that they have a chooser you can use to switch back and forth between iPod OS and Rockbox, so I think it'll stay on mine.

Also I don't think that the UM2s like the crossfeed feature. Seems to really bassify (yeah its a word) everything just a wee bit more than it should.

Haven't moved beyond my 2 test tracks yet.

noob, out.
post #45 of 121
is there a release that takes advantage of the 60gig ipods 64mb flash mem?


it would be nice if it had album art support aswell.
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