[Veniogenesis]

Hi everyone,

I just got an Apple iPod Universal Dock for my 2G Nano. Is it okay to go ahead and use headphones straight from the jack on the dock? Or would that be damaging to headphones? (Say, would that be bad for a W5000?)

Thanks everyone!
Venio

 

[camille]

doesn't the universal dock have a Line-Out? if so, i'd advise not connecting the headphones directly.

 

[Veniogenesis]

I believe it is indeed a line-out. Although, it is possible to control the volume of the line-out with the iPod's volume controls. What makes a line-out harmful for headphones? The current or voltage or ?

 

[TheMarchingMule]

Okay, you know what dB is? I'm not lecturing you. dB is the way sound noise is measured. Line-out is 0 dB; at least on Rockbox that's what it's called after being upped from a -58 dB point (silent).

Thus, 0 dB is damn loud. It's like your iPod volume turned...idk a little more than 95% up or so?

Believe me, it'll hurt with pretty much any headphone. It doesn't with my K701, but still...it'll hurt.

 

[Veniogenesis]

Quote:

Originally Posted by AtheisticFreedom Okay, you know what dB is? I'm not lecturing you. dB is the way sound noise is measured. Line-out is 0 dB; at least on Rockbox that's what it's called after being upped from a -58 dB point (silent). Thus, 0 dB is damn loud. It's like your iPod volume turned...idk a little more than 95% up or so? Believe me, it'll hurt with pretty much any headphone. It doesn't with my K701, but still...it'll hurt.

Well, yes, I know what a true line-out is supposed to be. I'm saying however that the dock was not what I expected. I always thought the iPod dock was supposed to be a fixed volume line-out. But strangely, I can change the volume. As a matter of fact, I can turn down the volume to silent. Is this something new for the 2G Nano? (The fact that you can control the volume out of the dock's line-out using the iPod's volume wheel.)

However. I had the impression that low volume doesn't necessarily mean it's safe. (Dealing with loads and the such.)


Edit: As a matter of fact, could it be that the new Nano's dock-out is no longer a line-out? However, the sound quality out of the dock is noticeably better than out of the headphone-out at the same volume.

 

[TheMarchingMule]

Interesting...iirc (I use that saying a lot now...), only a true line-out can never be adjusted from the source. Only an amp is able to adjust the stright load.

 

[Duncan]

It depends on a couple of factors (one of which I cannot answer, not having a 2G nano)

With the 5G, there are two line out options, one - fixed, and one variable - the iPod remote uses the variable one, and a standard dock connector uses the fixed one...

...Could the 2G have these the other way around or something, that would make a line-level dock not line level?

 

[Veniogenesis]

Ah, I see, thanks.

Is it okay to assume that it would be safe to use headphones out of a variable line-out though?

 

[blueworm]

Looking at the pin out HERE
There is only 1 set of line out pins.
However the ipod will behave differently depending on the value of the resitor across gnd and pin 21.

 

[jonnywolfet]

Quote:

Originally Posted by blueworm Looking at the pin out HERE There is only 1 set of line out pins. However the ipod will behave differently depending on the value of the resitor across gnd and pin 21.

thats interesting, where can i find more info on this?

 

[blueworm]

All I have found so far is on that sheet.

Code:

[left] 21 connected to ground via a resistor. Different resistances indicate which accessory is connected. Known resistances/functions (Ohms) are as follows: 1k0 - iPod docking station, iPod beeps when connected 10k - Takes my iPod into photo import mode 500k - vava uses this for his serial-via-dock experiments Used in Dension Ice Link Plus car interface 1M0 - Belkin auto adaptor, iPod shuts down automatically when power disconnected 5[/left]