---
product_id: 443893902
title: "SMP300 Class D Digital Subwoofer Amplifier Rated at 300W Max"
brand: "osd audio"
price: "S$999"
currency: SGD
in_stock: true
reviews_count: 5
category: "Osd Audio"
url: https://www.desertcart.sg/products/443893902-smp300-class-d-digital-subwoofer-amplifier-rated-at-300w-max
store_origin: SG
region: Singapore
---

# Efficient Class D digital amplification Compact 3"H x 9¼"D x 16¼"W design 300W max power output SMP300 Class D Digital Subwoofer Amplifier Rated at 300W Max

**Brand:** osd audio
**Price:** S$999
**Availability:** ✅ In Stock

## Summary

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

## Quick Answers

- **What is this?** SMP300 Class D Digital Subwoofer Amplifier Rated at 300W Max by osd audio
- **How much does it cost?** S$999 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sg](https://www.desertcart.sg/products/443893902-smp300-class-d-digital-subwoofer-amplifier-rated-at-300w-max)

## Best For

- osd audio enthusiasts

## Why This Product

- Trusted osd audio brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Cool & Compact:** Class D efficiency means no overheating and a sleek 3-inch height that 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—quality meets value.

## Overview

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 high-performance bass enhancement with efficient, cool operation at a budget-friendly price.

## Description

"If you’re ready to beef up the bass in your surround sound system, OSD Audio’s SMP300 is a Class D digital mono subwoofer delivers up to 300W of peak power to passive subwoofers so you can enjoy three dimensional surround sound from movie and music soundtracks. Designed for use with passive subwoofers such as in-wall subs that require external power, the SMP300 provides continuous, stable power but measures only 3” high so it can fit inside any equipment rack or cabinet. Moderately priced with high-end features, this compact sub amp includes variable low pass filter control for balanced and seamless sound quality as well as variable phase control for additional fine tuning. Multiple connection options include LFE input, line-level and speaker-level inputs to cover newer and old school source equipment.Variable Low Pass Filter and PhaseOSD Audio’s sub amp includes a front-panel variable low pass filter that allows you to adjust the upper frequency limit of the subwoofer to control the overlap of the subwoofer’s upper frequencies and the main speakers’ lower frequencies. This results in bass that complements the sound from the main speakers rather than overpowers. A front-panel variable phase control knob operates over a range from 0 degrees to 180 degrees and allows you to match the arrival times of the sound waves from the subwoofer and the main speakers. This fine-tuning results in bass that is less muddy or thumpy but rather smooth and detailed.Includes Class D Amp TechnologyThe SMP300 uses Class D digital amplifier technology that combines the best qualities of both Class A and B amp protocols into a highly efficient compact chassis that is ideal for budget-minded users who want a feature-rich digital sub amp that does not run hot or take up a lot of space. "

Review: The most important thing to me is that it works.
Review: Excellent Quality at a Low Price

## Features

- BRING ON THE BASS: A highly efficiency Class D subwoofer amplifier that serves up big bass with up to 300W max power
- WORKS WITH ALL RECEIVERS: Compatible with older and newer source equipment and includes LFE, line-level and speaker-level inputs for greater flexibility
- ADJUSTABLE CONTROLS: Includes adjustable phase and low pass filter to dial in just the right amount of low frequency sound effects
- EFFICIENT CLASS D TECHNOLOGY: A highly efficient Class D sub amp that is ideal for budget-minded users who want a feature-rich digital sub amp that does not run hot or take up a lot of space
- COMPACT DESIGN: Measures only 3” inches high, 9 ¼” deep and 16 ¼” wide to fit just about anywhere

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07R4464D3 |
| Brand | OSD Audio |
| Brand Name | OSD Audio |
| Customer Reviews | 3.9 out of 5 stars 164 Reviews |
| Included Components | Subwoofer Amplifier |
| Item Weight | 3.63 kg |
| Manufacturer | OSD Audio |
| Model | SMP-300 |
| Mounting Type | Surface Mount |
| Mounting type | Surface Mount |
| Number of Channels | 1 |
| Number of channels | 1 |
| Output Power | 300 Watts |
| Output power | 300 Watts |
| Package Type Name | box |
| Package type | box |
| Specification Met | CE |
| UPC | 810281010946 |

## Product Details

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

## Images

![SMP300 Class D Digital Subwoofer Amplifier Rated at 300W Max - Image 1](https://m.media-amazon.com/images/I/71lL+-FKfgL.jpg)

## Questions & Answers

**Q: how much power rms at 8 ohms?**
A: The manual mine came with "the 1000 Watt version" -- details it at providing 497 watts RMS at 8 ohms.

**Q: Anyone have an issue with the speaker out port not working?**
A: 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.

**Q: Does the SMP100 require a 12v trigger cable to work properly?**
A: 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.

**Q: Will this work with a polk s35 center channel speaker?**
A: Yes. But this amp would be overkill. Simply get an a/v receiver instead.

## Customer Reviews

### ⭐⭐⭐⭐⭐ The most important thing to me is that it works.
*by M***N on 22 March 2021*



### ⭐⭐⭐⭐⭐ Excellent Quality at a Low Price
*by R***L on 14 January 2020*



### ⭐ It's good, but... No, it's bad.
*by A***R on 17 December 2025*



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*Product available on Desertcart Singapore*
*Store origin: SG*
*Last updated: 2026-01-28*