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 Digital Subwoofer Amplifier Rated at 300W Max

Product ID: 443893902

Details

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

⚡Class D high-efficiency tech

📏Compact 3" x 9¼" x 16¼" design

🔊300W max power output

Description

🎶 Feel the bass, not the bulk — power your space with SMP300!

COOL COMPACT - Class D efficiency means no overheating, plus a sleek 3-inch height fits discreetly anywhere in your setup.
PLUG PLAY IMPRESS - Simple setup with automatic standby mode—upgrade your audio game without the hassle.
POWER THAT MOVES YOU - Delivers up to 300W peak power for deep, room-shaking bass that commands attention.
PRECISION BASS CONTROL - Adjustable low pass filter and phase controls let you fine-tune bass for a perfectly balanced soundstage.
SEAMLESS COMPATIBILITY - Works effortlessly with all receivers—old or new—with LFE, line-level, and speaker-level inputs.

The OSD Audio SMP300 is a compact, Class D digital subwoofer amplifier delivering up to 300W of peak power. Designed for passive subwoofers, it features versatile inputs (LFE, line-level, speaker-level), adjustable low pass filter and phase controls for precise bass tuning, and a space-saving design that fits easily into any audio rack. Efficient and cool-running, it’s the perfect upgrade for millennials seeking powerful, customizable bass without clutter or complexity.

Specifications

ASIN	B07R4464D3
Brand	OSD Audio
Built-In Media	Subwoofer Amplifier
Customer Reviews	4.2 4.2 out of 5 stars (36)
Item Weight	3.63 kg
Manufacturer	OSD Audio
Mfr Part Number	SMP-300
Model Number	SMP-300
Number of Items	1
Unit Count	1 Count

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