Ihave a keenwood kac 7252 amp that is running two mtx thunder 4500 12`s but amp fuse keeps blowing at higher volume why?

The Kenwood KAC-7252 and KAC-9104D are both great amps, but they have different strengths and weaknesses. The KAC-7252 is a 5-channel amp that can output 75 watts per channel at 4 ohms. It also has a built-in crossover and time alignment, which can be helpful for getting the most out of your woofers. The KAC-9104D is a 4-channel amp that can output 100 watts per channel at 4 ohms. It also has a built-in subwoofer output, which can be used to power a separate subwoofer.
If you are looking for an amp that can power all of your speakers, the KAC-7252 is a great option. It is also a good choice if you want an amp with built-in crossover and time alignment. However, if you are looking for an amp that can power a subwoofer, the KAC-9104D is a better choice. It is also a good choice if you want an amp with more power output.
Ultimately, the best amp for you will depend on your specific needs and budget. If you are not sure which amp is right for you, it is always a good idea to consult with a professional car audio installer.
Here is a more detailed comparison of the two amps:
Kenwood KAC-7252

• 5-channel amp
• 75 watts per channel at 4 ohms
• Built-in crossover and time alignment
• MSRP: $399

Kenwood KAC-9104D

• 4-channel amp
• 100 watts per channel at 4 ohms
• Built-in subwoofer output
• MSRP: $499

I hope this helps!

Your speakers should be more than adequate for your amp.

make sure all wires are correct on amp and head unit also try a bigger fuse or a circut breaker

Sounds like the subs are blown with the voicecoils fused together which means the amp is/was seeing a dead short ( zero Ohms reisitence) not good for any amp. Disconnect the speaker terminals from the amp and see if it turns on. The funny smell might have been the subs blowing up, i'll keep my fingers crossed for you.

why are you in stereo for subs? mono all the way.

You probably need to run 4 gauge wire if not already done so, and check the fuses on the amp, add the fuses together then buy the right fuse rating for the fuse connected under the hood

If it only does it when bridged, the ohm load may be too low.

Is it blowing the fuse on the amp or the one near the battery?

just run str8 pos and negative

could be bad mosfets or outputs, needs replace

Your units drawing too much current. it could be a wireing problem, a speaker problem, or the amp has a problem. the correct way to troubleshoot this would first do or have the amp bench tested. Or you can remove all the speakers and wires and turn up the amp. If the fuse still pops,have the amp serviced. Good Luck