Well it could very well be, but you have to take a couple things into consideration. How many Amps is the amp truly pushing out, do you have multiple amps going to same one fuse block? If so, you need to figure out the Amps of both and make sure your fuse block is setup to match closely to that configuration. You dont want to go way over and you dont ever want to go under the amps of the total group on that power line to the fuse block.
Example being, you have two amps, each say 2 x 30amp fuses. Most likely each fuse will govern a different part of the amp for protection purposes. You have a total of 4 x 30amp fuses equalling 120amp. You will want your fuse block to atleast have the 120amp for protection but you could go a bit higher, maybe say 150amp max. If you put to high of amp fuses on your block, you help the AMPs themselves basically fry if you are not careful. Most likely the fuses on the amps will go before the actual Amp does, but there are always those extreme cases where it could fry the amp.
Another topic you need to look at is your power and ground cabling. 4ga Wiring is really a happy norm between to high and to low in regards to funnelling power from your battery to your amp. When you have power cabling that is to small, in theory you are forcing the current to push harder against the wiring thus leading to potential problems down the road. Also the same can be said if you use a 0/1ga wire on an underpowered amp. If you have to much wire, you can in theory hamper the amps performance and ability to pull power from the power wire itself, thus causing a strain on the unit.
Also you want to look at your ground wiring and how it is setup. I personally found the thickest metal in our cars, the spot right above the middle seat post your back seat bolts onto. Right above that post where the seat rests on and you secure the back down with a nut the metal is quite thick right there. I drilled a nice little hole big enough to put a metal screw down it to secure my ground wires. I went as far as sanding off the paint down to bare to help with grounding of the wiring. Be mindful of not using to long of a screw in that location. Why you ask? Well your gas tank sits right behind that location. So the possibility of puncturing it while drilling and putting the screw in are ever present. I used a 1" screw to do the job nicely.
The wiring advice I just metioned is my own suggestion on what I have dealt with since getting into working with aftermarket car stereos and reading numerous Audiophile sites on such subjects. Everyone will have their own take on how wiring and fusing should go. I just wanted to let that be known
I hope this has helped a little bit
