I am finally onto the last mission but have hit a brick wall. I have enterered the elevator, got through the first set of stairs shooting the speakers but the got to the next section where you have to run up the stairs fast to reach the console to turn off the alarms

I found out many times you cannot reach the console in time to avoid your head being blown off. At the bottom tho i found the 2 white speakers you can shoot which i did which changed nothing, but theres also a red speaker thats undestructable right in front of you.

So now im totally stuck and cant go on, i read elswhere about there being 2 blue speakers in this location but cannot see them anywhere, can anyone help me please?

Look for a safe pocket I know there"s one on the stairs

I'm finished thanks, i used a +1 agility suite to make the sun.

I'm stuck in the same spot - there is another thread on the topic "stuck before the end" I think. I am on the first landing staring at the shielded speaker and can't make it to the alarm (this doesn't turn off the speaker so no point). The route I was given has you jumping on the I-beam at the top of the landing (past the flood lights on a stand) and then jumping to the doorway. Being this isn't Marion Brothers I am finding the platforming skills a little hard to take (30 tries with no success).

You can take a short cut and jump on a little beam, then jump to the exit door where it is safe. Then you can pause, make a quick run to the computer and turn off the alarms. It's a pain in the butt, as I fell about 3 times before making it. Try it in 3rd person.