multiple remotes?

yeah, you can control both with one remote. I do, too. but make it sure not to interrupt signal when you use it. it usually happened to me. when I try to volume up and down, it also makes macbook volume in effect. you need distance between macbook and hifi.

additional info

Pairing your iPod Hi-Fi with the remote

The included Apple Remote works with other compatible Apple products that have a built-in infrared (IR) receiver. You can set your iPod Hi-Fi to work only with the included remote so that remotes for your other devices do not affect your iPod Hi-Fi. This is called pairing.

To set your iPod Hi-Fi to work only with the included remote:

Connect your iPod Hi-Fi to an electrical outlet. If your iPod Hi-Fi has batteries, you do not need to connect it to an outlet.
Make sure other products that are compatible (see above) with the remote are not in range, and hold the remote close to your iPod Hi-Fi (about 3 to 4 inches away).
Press and hold the Menu and Next/Fast-forward buttons on the remote simultaneously for about six seconds. The status light blinks green several times. Your iPod Hi-Fi now works only with the paired remote.
To reset your iPod Hi-Fi to work with all Apple Remotes:

Connect your iPod Hi-Fi to an electrical outlet. If your iPod Hi-Fi has batteries, you do not need to connect it to an outlet.
Make sure other products that are compatible with the remote are not in range, and hold the remote close to your iPod Hi-Fi (about 3 to 4 inches away).
Press and hold the Menu and Previous/Rewind buttons on the remote simultaneously for about six seconds. The status light blinks green several times.
Your iPod Hi-Fi now works with all Apple Remotes.
You may wish to pair your other Apple Remote–compatible devices with other Apple Remotes so that the remote you use with your iPod Hi-Fi does not affect those devices. See the documentation that came with the other devices for instructions.