how much power rms at 8 ohms?

The manual mine came with "the 1000 Watt version" -- details it at providing 497 watts RMS at 8 ohms.

Anyone have an issue with the speaker out port not working?

First off , do you have a audio signal out from the receiver/ amp to the input of subwoofer? Please check wiring diagram of the manual it should work.

Does the SMP100 require a 12v trigger cable to work properly?

The SMP100 includes auto sensing that turns on the amp when an audio signal is detected then turns off automatically after 15 minutes when a signal is not detected, but it also has the manual on/off switch.

Item dimensions L x W x H	12.1 x 14.2 x 4.6 Centimeters
Manufacturer	OSD Audio
Mounting Type	Freestanding
Brand	OSD Audio
Number of Channels	1
Output Power	4E+1 Watts
Package Type Name	Box" or "Retail Packaging
Specification Met	Etl, Ce
UPC	819603019377
Brand Name	OSD Audio
Speaker Type	Subwoofer, Surround Sound
Colour Name	Black
Peak Power Handling - Speakers	100 Watts
RMS Power Range - Amplifiers	100 Watts
Product Dimensions	12.07 x 14.22 x 4.57 cm; 793.79 g
Item model number	SMP-100
Item Weight	794 g

SMP100 Subwoofer Amplifier 100W Class D Digital Subwoofer Amplifier Rated 100W Max, Black (SMP-100)

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