fuse amp problem

[inhale]

i recently bought a new secondary 350 watt speaker, in use with a 200W RCA reciever. my original speaker pair is 325W im currently using it with a 200W technics reciever. but, everytime i seem to turn up the volume on my RCA reciever it keeps getting clipped. i opened them both up, on my technics therse a 125v 5A fuse, 4A on the other. So i went out to radio shack and bought a new 5A fuse (even though it saids 4A on the reciever) and the DB level on the amp went higher then it did when i used a 4A fuse.

Could anyone explain what the amp rating on a fuse means, and also what kind of fuse should i get?
even though the RCA is the same wattage as the Technics reciever, the RCA cant compare to the volume level without getting clipped.

[Frank Berry]

All 200 watt amplifiers are not created equally.
You can't always believe the published specifications.
One amplifier might put out 200 watts into 8 ohms.
Another amplifier might put out 200 watts into 4 ohms but only 100 watts into 8 ohms.
In other cases, the published specifications are pure fiction.

As for the fuse. If the amplifier calls for a 4 amp fuse, use a 4 amp fuse. After all, it's there to protect the amplifier.
Increasing the amperage rating of a fuse will not make the amplifier put out more power.