--- product_id: 366155618 title: "OSD Audio SMP500 Mono-Channel Class D Subwoofer Amplifier with Onboard DSP 400W 4 -8 Ohm" brand: "osd audio" price: "9609.84 DT" currency: TND in_stock: true reviews_count: 5 category: "Osd Audio" url: https://www.desertcart.tn/products/366155618-osd-audio-smp500-mono-channel-class-d-subwoofer-amplifier-onboard store_origin: TN region: Tunisia --- # 400W RMS Power Variable High-Cut Filter Front & Back Panel Controls OSD Audio SMP500 Mono-Channel Class D Subwoofer Amplifier with Onboard DSP 400W 4 -8 Ohm **Brand:** osd audio **Price:** 9609.84 DT **Availability:** βœ… In Stock ## Summary > 🎬 Feel Every Beat: Power Your Passive Subs Like a Pro ## Quick Answers - **What is this?** OSD Audio SMP500 Mono-Channel Class D Subwoofer Amplifier with Onboard DSP 400W 4 -8 Ohm by osd audio - **How much does it cost?** 9609.84 DT with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/366155618-osd-audio-smp500-mono-channel-class-d-subwoofer-amplifier-onboard) ## 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 - β€’ **Power That Moves You:** Delivers a commanding 400W RMS with 1000W peak to shake your home theater with deep, clean bass. - β€’ **Reliable & Certified:** CE & ETL rated with a 2-year warranty, ensuring peace of mind for your investment in premium sound. - β€’ **Precision Bass Sculpting:** Variable high-cut filter and phase control let you tailor low-frequency output for flawless integration with your main speakers. - β€’ **Seamless System Integration:** Low and high-level pass-through inputs/outputs plus auto-sensing power on/off for effortless setup and energy savings. - β€’ **Rack-Ready & Remote-Controlled:** Sleek, rack-mountable design with included remote puts full control at your fingertips, blending professional aesthetics with convenience. ## Overview The OSD Audio SMP500DSP is a mono-channel 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, phase control, and front/back panel adjustable gain for precise bass tuning. Its auto-sensing power on/off and low/high-level pass-through inputs/outputs ensure seamless integration with modern and legacy home theater systems. Rack-mountable and remote-controlled, it’s CE & ETL certified and backed by a 2-year warranty, making it a powerful, efficient, and reliable choice for audiophiles seeking deep, clean low-frequency sound. ## 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: Excellent Quality at a Low Price - 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: 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 Β£600+ device this is unacceptable. Now being returned and reduced to one star, zero if there was an option. ## 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 | | Brand Name | OSD Audio | | Customer Reviews | 4.2 out of 5 stars 131 Reviews | | Included Components | 1 | | Item Dimensions | 38.1 x 12.7 x 15.2 Centimeters | | Item Type Name | Subwoofer Amplifier | | Item Weight | 8 Pounds | | Item dimensions L x W x H | 38.1 x 12.7 x 15.2 Centimeters | | Manufacturer | OSD Audio | | Material Type | Metal | | Maximum Output Power | 400W | | Maximum Supply Voltage | 220 Volts | | Minimum Supply Voltage | 110 Volts | | Model Number | SMP500DSP | | Mounting Type | Surface Mount | | Number of Channels | 1 | | Output Power | 400 Watts | | Package Type Name | cardboard box | | Part Number | SMP500DSP | | Specification Met | ce,etl | | UPC | 819603013177 | | Unit Count | 1 Count | | Voltage | 12 Volts , 220 Volts | | Warranty Description | 2-Year Warranty | ## Product Details - **Item dimensions L x W x H:** 38.1 x 12.7 x 15.2 Centimeters - **Voltage:** 220 Volts - **Manufacturer:** OSD Audio - **Maximum Supply Voltage:** 2.2E+2 Volts - **Mounting Type:** Surface Mount ## Images ![OSD Audio 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) ![OSD Audio SMP500 Mono-Channel Class D Subwoofer Amplifier with Onboard DSP 400W 4 -8 Ohm - Image 2](https://m.media-amazon.com/images/I/41t44NkVSQL.jpg) ![OSD Audio SMP500 Mono-Channel Class D Subwoofer Amplifier with Onboard DSP 400W 4 -8 Ohm - Image 3](https://m.media-amazon.com/images/I/51QgmHlPkJL.jpg) ![OSD Audio SMP500 Mono-Channel Class D Subwoofer Amplifier with Onboard DSP 400W 4 -8 Ohm - Image 4](https://m.media-amazon.com/images/I/61RYooGSvnL.jpg) ![OSD Audio SMP500 Mono-Channel Class D Subwoofer Amplifier with Onboard DSP 400W 4 -8 Ohm - Image 5](https://m.media-amazon.com/images/I/71p29Oq8KfL.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 ### ⭐⭐⭐⭐⭐ Excellent Quality at a Low Price *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. ### ⭐ 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 Β£600+ device this is unacceptable. Now being returned and reduced to one star, zero if there was an option. ### ⭐⭐⭐⭐⭐ Works well! *by M***L on 28 May 2026* Works well powers my passive subwoofer (same brand) like a movie theatre ! ## Frequently Bought Together - OSD Audio 800W Mono-Channel Class D Subwoofer Amplifier – Onboard DSP, 4-8 Ohm – SMP500 - OSD Premium 12" Outdoor Subwoofer 600W, In Ground Omni Directional, IP66 Weather Resistant Black XSUB12 - OSD Forza 6.5" Landscape In Ground/Mountable 80W Speaker, Commercial 70V Tap, Outdoor Weather Resistant, Bronze (Single) --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.tn/products/366155618-osd-audio-smp500-mono-channel-class-d-subwoofer-amplifier-onboard](https://www.desertcart.tn/products/366155618-osd-audio-smp500-mono-channel-class-d-subwoofer-amplifier-onboard) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-07-15*