I've been corresponding with Dr. Decibel from Celestion speakers and he has helped me to come up with some ideas for my AS Level technology project. I am going to be building a speaker cabinet which will be theoretically used in a school, therefore must be strong (able to cope with stupid vandal kids), must not take up much floor space and must be able to cope with being used in musicals/performances for bass guitar. 'The Doc' suggested that I use the Q15-2550 speaker. This is 300W and 8 Ohms. I have a 200W 4 Ohm amplifier. Will this work? Is it possible to convert it (through some clever wiring perhaps?) into 4 Ohm? Will it need it? He has also calculated the best volume and port sizes to tune it to below 35Hz so it will cope with a B. He says the cabinet must have an internal volume of 80 litres. How do I change it from volume in litres to 3 measurements? Anything else you can think of that might help? Thanks in advance.