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

⚡800W peak power punch

🎚️Variable high-cut filter control

🛠️Front/back panel adjustable gain

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Description

🎬 Feel every beat, command every room with SMP500 power!

POWER THAT MOVES YOU - Delivers a commanding 400W RMS @ 4Ω for deep, room-shaking bass that transforms your home theater experience.
EFFORTLESS INTEGRATION - Low and high-level pass-through inputs/outputs provide seamless compatibility with both legacy and modern audio systems.
PRECISION BASS CONTROL - Variable high-cut filter and phase switch let you tailor low-frequency output, ensuring crystal-clear mids and highs.
SMART EFFICIENT DESIGN - Class D technology keeps the amp cool and efficient, with auto-sensing power on/off to save energy and extend component life.
READY FOR THE RACK REMOTE - Rack-mountable form factor with included remote control for professional setup and convenient operation.

The OSD Audio SMP500DSP is a robust mono Class D subwoofer amplifier delivering 800W peak and 400W RMS at 4 ohms. Designed for high-wattage passive subwoofers, it features a variable high-cut filter, phase control, and adjustable gain for precise bass tuning. Its efficient, cool-running design includes auto-sensing power, low/high-level pass-through, and a rack-mountable chassis with remote control—perfect for elevating home theater and media room sound quality with deep, distortion-free bass.

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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