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

OSD Audio SMP300 Class D Digital Subwoofer Amplifier Rated at 300W Max

Product ID: 753821579

Details

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

⚡Efficient Class D digital amplification

📏Compact 3"H x 9¼"D x 16¼"W design

🔊300W max power output

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Description

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

COOL COMPACT - Class D efficiency means no overheating and a sleek 3-inch height fits effortlessly into any setup.
POWERFUL BASS BOOST - Unleash deep, room-filling bass with 300W peak power that transforms your audio experience.
PRECISION SOUND TUNING - Dial in perfect bass with adjustable phase and low pass filter controls for smooth, balanced audio.
UNIVERSAL COMPATIBILITY - Seamlessly connects with all receivers—old or new—thanks to versatile LFE, line-level, and speaker-level inputs.
BUDGET SAVVY HIGH PERFORMANCE - Get premium digital subwoofer amplification without breaking the bank or sacrificing space.

The OSD Audio SMP300 is a compact, 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 space-saving design that fits easily into any audio setup. Ideal for professionals seeking powerful, efficient, and budget-friendly bass enhancement.

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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