gain booster gadget?

goshawk on horseback

hello all,
does anyone know if there is a device for boosting the gain of a supposedly line level source?
I have a particular device that is supposed to give line level output, but I find that what it puts out of it's line out sockets is rather low level. I can get decent level out of it, but only by opening the fader of the channel on the desk that this particular device is on virtually full.
I know that many studio eq units also have gain controls, but really don't need any eq, just some extra gain, so wondered if there was a device to just do that job?
looking for a stereo, not single channel such box please.
hope that all makes sense.