Line-out to multiple sound equipment

[SpriteAlpha]

So, I have my HD 598 headphones connected to the headphone-out on my Xonar ST sound card. And my speakers are connected to the line-out. I recently bought some AKG K 601 headphones and have ordered a Shanling PH-100 amp. I'm wondering if there is something I can buy which will let me connect the line-out on the sound card to both the Shanling amp and my speakers?

 

[Shamrock]

You can get RCA splitters for cheap if you are wanting to just split the signal between your speakers and headphone amp.

Are your speakers active?