anyone know the RMS output of an ipod? - Page 2 - diyAudio
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Old 11th June 2008, 01:34 PM   #11
sek is offline sek  Germany
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You forgot to answer my first question.
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Old 11th June 2008, 02:28 PM   #12
gain is offline gain  United States
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sry sek,

its the 30GB video ipod with the touch/thumbwheel on the front. i am wanting to know the RMS voltage on the headphone outputs (1/8 stereo plug) when the ipod is cranked up at full volume with a good strong signal.

thanks.
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Old 11th June 2008, 02:50 PM   #13
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i suspect is somewhere in the ballbark of line level (~ +/- 1VRMS) since i have the ipod hooked to a line level input on a receiver im listening to now, ipod cranked to about 4/5, stereo on about 4, and it sounds (subjectively, to me) to be about the same input level as cd or tv or tape player would put in.




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Old 11th June 2008, 03:03 PM   #14
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All recent iPods have been video capable and all but the earliest models have a touch wheel on the front.

Each iPod has it's model number engraved on the lower right of it's back side.

Choose between iPod Classic (introduced September 2007), iPod with Video (late 2006 model) (discontinued September 2007) and iPod with Video (2005 model) (discontinued September 2006).

In case you can't find out, I'll just measure an iPod Classic this evening.
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Old 11th June 2008, 03:41 PM   #15
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see attached. thanks again for your help.
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File Type: jpg ipod.jpg (7.4 KB, 382 views)
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Old 11th June 2008, 03:55 PM   #16
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cant read the model #. its been worn off many times over.
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Old 11th June 2008, 06:39 PM   #17
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ok just hooked up a stereo dual ganged pot to my tape input on the line level side. (i have lots of different sources that seem to all have there unique version of what 'line level' means) so this comes in handy. i can just set the pot for the correct amount of input drive for whatever i had connected.

now onto the ipod. i had just finishing calibrating the pot so that a cd player sounded about right for line level. didn't sound weak at all yet could crank to ten with no distortion. so i hook up the ipod without moving the pot. had to crank it up (the ipod) all the way just to get about 1/2 the sound the signal level from the cd player gave.

so i guess that ipod puts out somewhere 1/2 line level (ie: ~500mv RMS)

still hoping someone out there has a scope that can confirm.
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Old 11th June 2008, 08:58 PM   #18
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Well, I've measured the iPod Classic's headphone out and the iPod Dock's line out on a scope.

The picture shows the iPod Classic in an Apple iPod Dock, both in front of the scope used.
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File Type: jpg ipod-dock-scope.jpg (78.3 KB, 349 views)
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Old 11th June 2008, 09:04 PM   #19
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Turns out the level via iPod Classic's headphone out into a high impedance load is Up ≈ 0.47 Vp (peak) with my European model (probably output level limited due to EU regulations).

This means Urms ≈ 0.332 Vrms and thus Lu ≈ -7.3 dBu.
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File Type: jpg 1khz-headphone.jpg (76.5 KB, 327 views)
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Old 11th June 2008, 09:06 PM   #20
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The level via Apple's iPod Dock's line out into a high impedance load is Up ≈ 1.14 Vp (peak) with the Dock powered by the iPod (similar, but not identical to a direct out condition).

This means Urms ≈ 0.8 Vrms and thus Lu ≈ -0.3 dBu.
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File Type: jpg 1khz-dock.jpg (67.5 KB, 320 views)
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