I was always under the impression that the iPod line out was exactly the same as headphone output except for being of fixed volume and higher impedance, it isn't a clean output that bypasses the internal amp as such. Is this something that has changed in recent years?
it has never been the case they have been the same, line out has always bypassed the cheap internal parts
Do you have a source for that?

The headphone out of the newer iPhones and iPads in particular aren't bad at all, they measure decently. Once you add an amp the only limiting factor of iOS devices is the DAC, as the older iPods used a Wolfson chip and the newer ones have a Cirrus Logic one IIRC. They are decent but obviously not high end, which led to the development of the Algorhythm Solo and HP-P1 devices.
Anyway, re; portable amps. The reason you buy one is because your source lacks the ability to drive your headphones properly, or in the case of many balanced armature IEMs, there is an impedence mismatch which can alter the frequency response. Generally modern players have enough oomph to drive cheap headphones adequetely, it's when you start wanting to take big, hungry, inefficient full-size cans out and about that portable amps become really useful, especially ones with adjustable gain stages etc so you can get an optimum amount of volume to play with.
theres millions of threads on head-fi, take a look on there![]()

The headphone out of the newer iPhones and iPads in particular aren't bad at all, they measure decently. Once you add an amp the only limiting factor of iOS devices is the DAC, as the older iPods used a Wolfson chip and the newer ones have a Cirrus Logic one IIRC. They are decent but obviously not high end, which led to the development of the Algorhythm Solo and HP-P1 devices.
Anyway, re; portable amps. The reason you buy one is because your source lacks the ability to drive your headphones properly, or in the case of many balanced armature IEMs, there is an impedence mismatch which can alter the frequency response. Generally modern players have enough oomph to drive cheap headphones adequetely, it's when you start wanting to take big, hungry, inefficient full-size cans out and about that portable amps become really useful, especially ones with adjustable gain stages etc so you can get an optimum amount of volume to play with.
iphones and ipods are designed to be high quality sources for IEM's, not aftermarket expensive cans, that is why you need to use line out and a portable amp with a decent pair of cans.
the thing is though, with this being a nerdy forum, people see someone else buy an E% or an E^ and they go out and buy the same thing thinking, oh it offers better SQ, but they have no idea how to use them.
ive had to tell numerous members in GD that they are using their amps wrongly or they bought the wrong amp in the first place.
people are buying the E7 for over £50 thinking its better as an amp because it costs more money, when the E11 at £42 is a lot better amp.
a lot of people buying E5's and E6's who have no reason to do so or using them with headphone out socket's and not using them with line out signals.
im amazed at the amount of stuff people will buy when they have no clue what it is supposed to be used for or how it works, because they saw a fellow member buy or use them.
I find the headphone output on my iPad 2 to be very quiet on my senn hd25, which is why I bought an e11 and an iDock to 3.5mm adapter. Sounds so much better.
In comparison my old iPod classic ( 4 gen I think ) is really loud via the headphone out socket.
I think some popular portable headphones (like your Senns) are designed for higher impedance sources (like the old iPods). The newer iOS devices are quite low impedance, so you can experience differing sound quality depending on what you're plugging into it.
i have a iphone 4 and have ordered a pair of beyerdynamic 1350 headphones.....excuse me for being a total noob but would i benefit from buying a e11 amp for these or would it be a waste?...i like to walk 3-5 miles a night and enjoy being immersed in quality sound
been having a look at these the last half hour, what is the best line out cable to get?
im thinking L9 but i noticed you get L1 and L3 also.im i right thinking L9?
I had looked on there but there is no official definitive answer, just loads of threads like this: http://www.head-fi.org/t/380671/the-ipods-line-out-is-inferior/15
I was just interested that's all. I've lost my old E5 which I used to use with a Sony aw3000 set to line out. Just looking into what to get now for use with iPhone, iPod and iPad![]()
the L1 is horrible
the L9 = L3 the wire comes out at a different angle i think making the L9 better for ipod use i think.
so get either the L9 or L3
L9 it is then with the E11
very quickly off topic what do you think about BD 1350?
you seem to be knowledgable and frank in your answers
so tell me have i made a good purchase or not?
get the same as above an L9 or L3 with either an E6 or E11, the E11 being much better for SQ.
