How do I figure out the specs on a compound bow?

All of these specifications should be in the manual.

For the Bowtech Assasin the specs are as follows:

Draw Weight: 50,60,70

Mass Weight: 3.8 pounds

Effective Let-Off: 65%-80%

Draw Length: 26''-30''

String Length: 55 7/16

Cable Length: 36 5/8

As far as the Matthews goes, I do not know which specific model you are talking about so I cannot comment further, but check out their website and maybe you can find it there.

http://mathewsinc.com/

...you went out and bought something you don't know how to use ?...really ?....