AE hooked to stereo - very high volume! adjustable?

I have been using an Airport Express plugged with analog headphone plug into a fairly high-end Yamaha RX-V2500 receiver. Works great.
I just bought a 2nd Airport Express and plugged it into a much smaller, far lower end Tivoli Radio Works system. I had my iPod's dock plugged into the aux input and was using that fine. I replaced the iPod with the AE and notice that the AE-output sound is extremely high volume. I set the Tivoli's volume to maybe 3-4% and it's as loud as I'd ever listen to it normally.
Not sure why I didn't notice this on the Yamaha - perhaps it scales down the input? Is there a way to get the AE to "quiet down" on the Tivoli? Some AE setting? Thanks.
Is it damaging to plug the AE to analog line in on a stereo, given the volume?
blakespot

For the AX, the analog audio is handled by a Texas Instruments PCM2705 digital-to-analog converter which it outputs on a 3.5mm stereo minijack. It has a maximum output level of 1.53V, which is 2.3dB lower than a CD standard's 2V. The output impedance is around 15 ohms across the audioband.
It appears that the audio input port's impedance, between your Yamaha and Tivoli, are different and why you are hearing a significant difference in volumes. The signal from the AX is not amplified, and thus, why it would require either powered speakers or a LINE in for play back.
The AX gets is audio source, by default, from iTunes. You can adjust the output level from there.

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AE hooked to stereo - very high volume! adjustable?

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