HA4700 output into another headphone amp?

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Hey all;


I have a Behringer HA4700 as my main headphone amp here in the control room.  I have it connected running from each of the 4 direct outs on the back to the 1/4" plugs on the snake to the breakout box in the tracking room.  Typically, then, I'd plug headphones into the four 1/4" jacks of the snake.  So far so good...


My question....


To get more outputs in the tracking room, I've grabbed another headphone amp from another brand that a friend was getting rid of.  It specifies the maximum input level as +18dBV.


Can I connect the new headphone amp to the snake in the tracking room without wrecking anything?  


I looked in the manual for the HA4700 but it doesn't give any information about the output levels I'd be potentially sending INTO the other headphone amp.


Thanks!