---
product_id: 594860150
title: "OSD Audio SMP-100 100W Mono-Channel Class D Subwoofer Amplifier"
brand: "osd audio"
price: "1232 Lei"
currency: RON
in_stock: false
reviews_count: 5
url: https://www.desertcart.ro/products/594860150-osd-audio-smp-100-100w-mono-channel-class-d-subwoofer
store_origin: RO
region: Romania
---

# 100W Class D power Runs cool under load Adjustable low-pass filter OSD Audio SMP-100 100W Mono-Channel Class D Subwoofer Amplifier

**Brand:** osd audio
**Price:** 1232 Lei
**Availability:** ❌ Out of Stock

## Summary

> 🎵 Tiny Amp, Tremendous Bass — Feel Every Beat!

## Quick Answers

- **What is this?** OSD Audio SMP-100 100W Mono-Channel Class D Subwoofer Amplifier by osd audio
- **How much does it cost?** 1232 Lei with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.ro](https://www.desertcart.ro/products/594860150-osd-audio-smp-100-100w-mono-channel-class-d-subwoofer)

## 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

- • **Compact Powerhouse:** Delivers a mighty 100W output in a sleek, space-saving design under 6 inches wide.
- • **Smart Auto Standby:** Automatically powers down after 15 minutes of inactivity, saving energy without lifting a finger.
- • **Cool & Efficient Tech:** Class D amplifier technology ensures high efficiency with minimal heat, perfect for all-day use.
- • **Precision Bass Control:** Front-panel adjustable low-pass filter, phase, and volume knobs let you tailor deep bass exactly to your room.
- • **Versatile Connectivity:** Supports both RCA and speaker-level inputs, powering subwoofers and in-ceiling speakers seamlessly.

## Overview

The OSD Audio SMP-100 is a compact yet powerful 100W Class D subwoofer amplifier designed for home theaters and whole-house audio systems. Featuring adjustable low-pass filtering, phase, and volume controls on the front panel, it delivers distortion-free, room-shaking bass while running cool and efficient. With versatile input options and smart auto-standby, it’s the perfect upgrade for millennials seeking premium sound without bulk or hassle.

## Description

OSD Audio's Class D Digital Subwoofer Amplifier is a compact 100W amp designed to power passive subwoofers used in a home theater or whole-house audio system. We call this our “tiny but mighty” powered sub because it measures less than six inches wide but supplies an in-wall or stand-alone subwoofer the power it needs so you can experience room-shaking low-frequency impact (bass) on movie and music soundtracks. The advanced crossover circuit can be set at different frequency ranges (35Hz to 160Hz) and is adjustable with a front-panel control knob. Other features include the front-panel adjustable phase and volume controls to dial in just the right amount of low-frequency effects (LFE). The SMP100 uses Class D amplifier technology that combines the best qualities of both Class A and B amp protocols into a highly efficient and compact digital design 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. With both RCA and speaker level connections, the SMP100 also acts as a distributed amplifier and will power a pair of in-ceiling speakers in addition to a sub.

Review: It's a simple connect and play could not be any more simple. I hooked it up to a 10'' JBL Subwoofer and i am happy.
Review: Received this OSD SMP-100 subwoofer amp on January 9th 2020, after looking at different models this one made the most sense. After hooking it up and doing my tests this amp was exactly what I needed to include in my whole house audio system. This sub amp works excellent wired into my receiver and my 4 zone 8 speaker selector switch for my ceiling speakers with a separate not passive but an 8 inch active subwoofer, if it is wired and set up correctly this little amp @ 80RMS 100watts of power into 4 ohms can deliver enough power to shake my whole house at quarter of the volume from watching a movie or playing music it’s very clean sound with no hum feedback, it has a phase control to adjust for sub placement, a crossover control so you can adjust and set the low pass to your desire level and an overall volume control to set the desire volume, it will automatically switch off after 15 minutes if no audio signal is detected so no need for you to switch on and off manually. My recommendation is not to use speakers that are more than 8 inch 4 to 8 ohms as stated in the manual. Following a correct set up this little amp will deliver a clean solid deep bass without being out of phase with your system. This sub amp can also be used for powering an in-wall passive subwoofer like the OSD IWS 8 series which I will be doing later.

## Features

- A compact 100-Watt Class D subwoofer amplifier for multiple source applications
- Ideal for powering subwoofers used in whole-house audio or dedicated home theaters
- Highly efficient Class D technology runs cool under demanding loads
- Adjustable low-pass filter for distortion-free bass
- Front panel phase and volume controls

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07HJDQ8Q3 |
| Item model number | SMP-100 |
| Manufacturer | OSD Audio |
| Product Dimensions | 12.07 x 14.22 x 4.57 cm; 793.79 g |

## Product Details

- **Brand:** OSD Audio
- **Item dimensions L x W x H:** 12.1 x 14.2 x 4.6 centimeters
- **Manufacturer:** OSD Audio
- **Mounting type:** Freestanding
- **Number of channels:** 1

## Images

![OSD Audio SMP-100 100W Mono-Channel Class D Subwoofer Amplifier - Image 1](https://m.media-amazon.com/images/I/615PL9nIzTL.jpg)
![OSD Audio SMP-100 100W Mono-Channel Class D Subwoofer Amplifier - Image 2](https://m.media-amazon.com/images/I/61VO4VkcozL.jpg)
![OSD Audio SMP-100 100W Mono-Channel Class D Subwoofer Amplifier - Image 3](https://m.media-amazon.com/images/I/713AFgP-VOL.jpg)
![OSD Audio SMP-100 100W Mono-Channel Class D Subwoofer Amplifier - Image 4](https://m.media-amazon.com/images/I/71d95OIZmjL.jpg)
![OSD Audio SMP-100 100W Mono-Channel Class D Subwoofer Amplifier - Image 5](https://m.media-amazon.com/images/I/71iEjNbhfjL.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

### ⭐⭐⭐⭐⭐ Review
*by M***N on 22 March 2021*

It's a simple connect and play could not be any more simple. I hooked it up to a 10'' JBL Subwoofer and i am happy.

### ⭐⭐⭐⭐⭐ Review
*by R***L on 14 January 2020*

Received this OSD SMP-100 subwoofer amp on January 9th 2020, after looking at different models this one made the most sense. After hooking it up and doing my tests this amp was exactly what I needed to include in my whole house audio system. This sub amp works excellent wired into my receiver and my 4 zone 8 speaker selector switch for my ceiling speakers with a separate not passive but an 8 inch active subwoofer, if it is wired and set up correctly this little amp @ 80RMS 100watts of power into 4 ohms can deliver enough power to shake my whole house at quarter of the volume from watching a movie or playing music it’s very clean sound with no hum feedback, it has a phase control to adjust for sub placement, a crossover control so you can adjust and set the low pass to your desire level and an overall volume control to set the desire volume, it will automatically switch off after 15 minutes if no audio signal is detected so no need for you to switch on and off manually. My recommendation is not to use speakers that are more than 8 inch 4 to 8 ohms as stated in the manual. Following a correct set up this little amp will deliver a clean solid deep bass without being out of phase with your system. This sub amp can also be used for powering an in-wall passive subwoofer like the OSD IWS 8 series which I will be doing later.

### ⭐ Review
*by A***R on 17 December 2025*

Product came from the USA so it took a little time but after receiving and installing it initially seemed to work OK. However, the trigger function is a problem. Connecting to an Arcam AVR20 Integrated Amp to sync power on/off. The trigger functions fails to operate, indeed there is a "buzzing/fizzing" sound coming from the SMP500 and sounds like a short-circuit... I immediately pulled the power cord fearing damaged to either my AVR20 or the SMP500. I checked the polarity, voltage and current of the trigger cable and AVR20 output and it is within spec ( AVR20 DC +12v 70mA, 3.5mm jack, tip +). and correctly wired. In the "On" mode, it works as expected but the "Music" mode should turn off when a signal is not present and on when a signal is detected, but it's unreliable, sometimes it does, others it doesn't. I attempted to find a support link to the manufacturer (OSD) but they only offer dealer support. On the Amazon order page there is no option to "ask a question", so I contacted customer service and the only option was to return the product, no help there. I suspect that it has a fault, or the labeling is incorrect (e.g. the + and - symbols are incorrect or specifications are wrong), can you please confirm the the product labeling is correct (+ and - and trigger in/out and switch setting 12v/On/Music). Setting the switch to "12v" and "External Trigger On" in the software setting is what I understand is correct but that can't be confirmed it seems. I have decided to keep the product but am concerned that it will be a problem in the future, a risk. The reason for only two stars is that there is no UK support, to even ask a question of. So after the 30 days Amazon option of return any warranty is useless it seems. Update. Now there's a pulsing noise emitting from the driver, even when the phono isn't connected. This noise is sufficiently load that I can hear it 15 feet away in the primary listening position during the quiet gaps in films/music. For a £600+ device this is unacceptable. Now being returned and reduced to one star, zero if there was an option.

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*Product available on Desertcart Romania*
*Store origin: RO*
*Last updated: 2026-01-27*