---
product_id: 299310545
title: "SMP500 Mono-Channel Class D Subwoofer Amplifier with Onboard DSP 400W 4 -8 Ohm"
brand: "osd audio"
price: "E£ 143822"
currency: EGP
in_stock: true
reviews_count: 6
category: "Osd Audio"
url: https://www.desertcart.com.eg/products/299310545-smp500-mono-channel-class-d-subwoofer-amplifier-with-onboard-dsp
store_origin: EG
region: Egypt
---

# 400W RMS power output Variable high-cut filter 30-150Hz Front/back panel adjustable gain & limiter SMP500 Mono-Channel Class D Subwoofer Amplifier with Onboard DSP 400W 4 -8 Ohm

**Brand:** osd audio
**Price:** E£ 143822
**Availability:** ✅ In Stock

## Summary

> 🎬 Feel every beat, command every scene with SMP500 power.

## Quick Answers

- **What is this?** SMP500 Mono-Channel Class D Subwoofer Amplifier with Onboard DSP 400W 4 -8 Ohm by osd audio
- **How much does it cost?** E£ 143822 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.eg](https://www.desertcart.com.eg/products/299310545-smp500-mono-channel-class-d-subwoofer-amplifier-with-onboard-dsp)

## 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

- • **Smart Auto-Sensing:** Energy-efficient auto on/off feature activates the amp only when a signal is detected—cutting power waste without missing a beat.
- • **Precision Bass Control:** Fine-tune your subwoofer’s response with a variable high-cut filter and front panel knob for crystal-clear sound separation.
- • **Powerhouse Bass Delivery:** Unleash 400 watts RMS of clean, distortion-free low-end power for immersive home theater experiences.
- • **Seamless System Integration:** Flexible low/high-level pass-through inputs/outputs ensure compatibility with both vintage and modern audio setups.
- • **Rack-Ready & Remote-Controlled:** Sleek rack-mount design with included remote control puts professional-grade subwoofer management at your fingertips.

## Overview

The OSD Audio SMP500DSP is a robust mono Class D subwoofer amplifier delivering 400W RMS at 4 ohms with peak power up to 1000W. Designed for high-wattage passive subwoofers, it features a variable high-cut filter, adjustable gain, volume limiter, and versatile input/output options for seamless integration. Its auto-sensing power feature and remote control enhance convenience, while rack-mount compatibility suits professional home theater setups. Despite powerful performance and advanced controls, some users report trigger function reliability issues and limited manufacturer support.

## Description

OSD Audio’s SMP500DSP Class D Subwoofer Amp is designed for use with higher wattage passive subwoofers such as in-wall subs that require external power. This sturdy sub amplifier is not for the faint of heart. It serves up 1000 watts of power peak and 400W RMS @ 4 ohm, so to say that it is powerful is an understatement. You’ll experience deep, rich and crisp bass while watching your favorite movies, especially action and adventure flicks. A big bang for the buck, features include a front-mounted power meter, back panel adjustable gain and volume control limiter to protect the woofers as well as low-level and high-level pass-through input/outputs to cover newer and old school sound systems. Combining the best qualities of both class A and B amp technologies, distortion is low while efficiency is high, and the SMP500DSP Mono Amp also includes a variable high cut filter that routes higher frequencies to main speakers. This allows subs to concentrate on the low frequency sound effects for which they are designed and keeps low bass away from your surround speakers for much cleaner highs and midrange. This sub amp does more than just supply power. You’ll notice an improvement in the overall sound quality of your entire home theater surround sound system. Specifications: Mono Class D dedicated subwoofer amplifier 1000 Peak Power / 400W Continuous RMS @ 4 ohm Total Harmonic Distortion (THD): Variable High Cut Filter 30Hz – 150Hz; front panel Knob Additional Front panel controls: Phase Switch and Volume Control Choice of Signal Level Input or LFE (Low Frequency Effects) Three Turn on Choices: Music Sensing, Manual On or hard 12 Volt Trigger Back Panel Adjustable Gain /Volume Control Limiter Both Signal (Low Level) and Speaker (High Level) Pass through Input/outputs Maximum Output: two 8-ohm Sub Woofers or Single 8-ohm DVC Woofer 110/220V switchable DWH 14” x 17.13”W x 1.7” H x 9.5”D 7.6 pounds Auto Off Time: 20 minutes Auto-on Sensitivity: 5 mV Remote control included 2-Year Warranty

Review: It's good, but... No, it's bad. - 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 desertcart 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 desertcart 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.
Review: Es compacto

## Features

- The SMP500 is designed for use with higher wattage passive subwoofers that require external power with up to 800 watts power peak / 400 watts RMS with 4 ohms. It has highly efficient Class D technology to run cool under demanding loads.
- SOUND QUALITY: Get a deep, crisp, clean low-frequency sound effect in dedicated home theater systems and media rooms to improve the overall sound quality of surround sound systems with dual 100/220 voltage.
- BASS: This amplifier improves bass response of passive subs with a variable high-cut filter and a front panel control knob that routes higher frequencies to main speakers for low frequency sound effects.
- CONTROL FEATURES: The SMP500 includes front-mounted power and back panel adjustable gain. A volume control limiter protects the woofers while low and high level pass-through inputs/outputs for greater flexibility.
- DESIGN: Rack mountable, the SMP500 supplies in-wall or stand-alone subwoofers with the power they need. CE & ETL rated with an auto sensing feature that automatically turns the amp on or off when a signal is detected. A remote control is included.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07F94FSLF |
| Guaranteed software updates until | unknown |
| Item model number | SMP500DSP |
| Manufacturer | OSD Audio |
| Product Dimensions | 38.1 x 12.7 x 15.24 cm; 3.63 kg |

## Product Details

- **Item dimensions L x W x H:** 38.1 x 12.7 x 15.2 centimetres
- **Manufacturer:** OSD Audio
- **Maximum supply voltage:** 220 Volts
- **Mounting type:** Surface Mount
- **Voltage:** 220 Volts

## Images

![SMP500 Mono-Channel Class D Subwoofer Amplifier with Onboard DSP 400W 4 -8 Ohm - Image 1](https://m.media-amazon.com/images/I/51VHJ8bGwbL.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

### ⭐ It's good, but... No, it's bad.
*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.

### ⭐⭐⭐⭐⭐ Review
*by L***Y on 28 June 2025*

Es compacto

### ⭐⭐⭐⭐ Review
*by M***T on 3 July 2021*

I just wished it was WiFi controls instead of a ir-remote

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*Product available on Desertcart Egypt*
*Store origin: EG*
*Last updated: 2026-03-14*