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.

Will this work with a polk s35 center channel speaker?

Yes. But this amp would be overkill. Simply get an a/v receiver instead.

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OSD Audio SMP300 Class D Subwoofer Amplifier, 500W Max Power, Digital Mono Amp for Passive Subwoofers, Adjustable Crossover, Phase and Volume, LFE Line-in

Product ID: 326278186

Details

Brand
OSD Audio
Manufacturer
OSD Audio
Mounting type
Surface Mount
Number of channels
1
Output power
500 Watts

📏Compact 3" height

🔊500W max power

⚙️Adjustable crossover & phase

S$1141

Duties & taxes included

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Description

🎶 Elevate your sound game with bass that’s as smart as your setup!

EFFICIENT COOL - Class D technology delivers high power without overheating or bulky size.
SPACE SMART DESIGN - Slim 3-inch height fits discreetly in any entertainment setup, maximizing your space.
POWERFUL BASS IMPACT - Unleash up to 500W of deep, room-filling bass that commands attention.
PRECISION SOUND TUNING - Dial in perfect bass with adjustable low pass filter and phase controls for crystal-clear audio.
SEAMLESS COMPATIBILITY - Works effortlessly with all receivers via LFE, line-level, and speaker-level inputs.

The OSD Audio SMP300 is a compact, efficient Class D digital mono subwoofer amplifier delivering up to 500W max power. Designed for passive subwoofers, it features adjustable crossover and phase controls for precise bass tuning, multiple input options for broad compatibility, and a slim profile that fits seamlessly into any audio rack or cabinet.

Specifications

ASIN	B07R4464D3
Box Contents	Subwoofer Amplifier
Brand Name	OSD Audio
Customer Reviews	4.2 4.2 out of 5 stars (36)
Item Weight	3.63 kg
Manufacturer	OSD Audio
Manufacturer Part Number	SMP-300
Model Number	SMP-300
Number of Items	1
Unit Count	1.0 count

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