Im interested in buying a krell KAV-400XI. Since it isnt cheap it will leave me no budget left for speakers. But my brother sent me his sony speakers. 3 way system. 6" bass, 4" mid, 1" Tweet. I looked inside it today... no crossover. It has push terminals, and it resonates like a bitch. First thing Im going to do is replace the speaker wire inside. But can I put a croosover in it? Also would dynamat help the resonating? Im curious how cheaply I can make this a decent speaker. It says it handles up to 150 watts. I know sony over rates stuff so with they last the 6 months needed before I get new speakers. The krell is 200 Watts a channel at 8 Ohms. THe things I want to do to them are... Fix or Help the resonating cabinet. Put new terminals on it. Replace the wiring inside. Maybe put a real crossover in it.