Is 2,500 watts the real power output?

That is the peak (max) rating. Continuous RMS power per channel is much lower, so match speakers to the RMS figures rather than the peak number.

Do I need a PC to tune the DSP?

No. You can tune over USB from a computer or through the Razor DSP app on Android and iOS. The app covers the main adjustments; the PC interface is better for detailed work.

Can it run an active front stage?

Yes. With five channels and DSP crossovers you can run tweeters, midbass and a subwoofer actively, or keep passive front speakers and use the extra channels for rear fill.

Does the Bluetooth work for phone calls?

It is for streaming audio into the amplifier, not a hands-free calling system. Calls stay on your head unit or phone.

The amplifier, mounting hardware and the USB connection for DSP setup. Check the listing for the specific cable and remote contents before installing.

How does it compare with a separate DSP and amp?

It saves space and wiring and usually costs less than a dedicated DSP plus a five-channel amp. A separate processor gives finer tuning and more inputs, which matters for serious competition builds.