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

⚡Efficient Class D digital amp tech

📏Compact 3" x 9¼" x 16¼" design

🔊300W max power output

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Description

🎶 Feel the bass, not the bulk — compact power that transforms your soundscape!

COOL COMPACT - Class D efficiency means no overheating and a sleek 3-inch height fits anywhere in your setup.
SMART AUTO STANDBY - Saves energy by automatically powering down after 15 minutes of silence—effortless and eco-friendly.
POWERFUL BASS BOOST - Unleash up to 300W of deep, room-shaking bass that commands attention.
PRECISION SOUND TUNING - Dial in perfect bass with adjustable phase and low pass filter controls for a flawless audio blend.
UNIVERSAL COMPATIBILITY - Seamlessly connects with all receivers—old or new—with LFE, line-level, and speaker-level inputs.

The OSD Audio SMP300 is a high-efficiency Class D digital subwoofer amplifier delivering up to 300W peak power. Designed for passive subwoofers, it features adjustable phase and low pass filters for precise bass tuning, multiple input options for broad compatibility, and a compact form factor that fits easily into any audio setup. Ideal for professionals and audiophiles seeking powerful, clean bass without the heat or size of traditional amps.

Specifications

ASIN	B07R4464D3
Brand Name	OSD Audio
Customer Reviews	4.0 4.0 out of 5 stars (167)
Included Components	Subwoofer Amplifier
Item Weight	3.63 kg
Manufacturer	OSD Audio
Maximum Output Power	300 watts
Model	SMP-300
Mounting Type	Surface Mount
Number of Channels	1
Output Power	300 Watts
Package Type Name	box
Part Number	SMP-300
Specification Met	CE
UPC	810281010946
Unit Count	1 Count

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