Pioneer GM-DX874 Car Amplifier: Testing reveals surprising results-really not a capable Sub amp!

We dig into the Pioneer GM-DX874 for a solid test. We evaluate the output of this amplifier. What is it capable of? Can it truly run a 4/3/2 channel car audio sound system? We have run it through its tests....
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This is not a subwoofer amplifier. Its a great mid-bass 4-channel amplifier. It doesn't load well and the Pioneer specification sheet tells you what you need to know. Is it a bad amplifier........

Timestamps:
0:09 - Introduction
1:12 - Unboxing
1:45 - Inside the box
2:27 - GM-D8704 vs GM-DX874 differences
2:58 - High and Low Pass filters
3:05 - Variable Bass Boost
3:38 - (2) Channels driven 4 Ohms 40 Hz
4:05 - (2) Channels driven 4 Ohms 1 Hz
4:29 - (2) Channels driven 2 Ohms 40 Hz
4:49 - (2) Channels driven 42 Ohms 1 Hz
5:15 - Output shows this is not a good subwoofer amp
5:32 - Conclusion
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Thank you for watching, and we can't wait to share our audio journey with you!