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OSD Audio SMP500 Class D Subwoofer Amplifier, 800W Max Power, Digital Mono Amp with DSP for Passive Subwoofers, LED Display/Remote, LFE Line-in

  • Based on 36 reviews
Condition: Used - Very Good
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$549.99 Why this price?
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Size: 500W DSP


Style: Digital


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.

Description

Optimal Speaker Design is engaged in the design, engineering, and distribution of high-quality home and commercial audio products. Our products range in complexity from simple in-ceiling speakers to whole house audio systems - all with beautiful styling and high-end sound quality. Our U.S.-based research, development, and design team is supported by a network of cutting-edge acoustical, mechanical, and electrical engineers. Together, we create products that combine the latest technology with ease of use for a quality sound experience. The amplifiers are 4 ohm stable, which doubles the current demand output and can power two 8 ohm subwoofers wired in parallel. The phase control operates over a range of 0 to 180 degrees and compensates for a delay between the subwoofer and the main speakers. The advanced crossover circuit can be set at different frequency ranges (35Hz to 160Hz) and can be adjusted with the front-panel control knob. Highly efficient Class D technology runs cool under demanding loads and doesn't take up a lot of space. Features: This sturdy subwoofer amplifier is not for the faint of heart! It serves up 800 watts of power peak @ 4 ohms, 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 home audio company who understands that good audio equipment doesn’t necessarily have to cost an arm and a leg. Founded in 2003 by a group of audiophiles who understood that good audio products didn’t necessarily have to cost an arm and a leg. We started with a small line of outdoor rock speakers that immediately gained attention. OSD has maintained the core values that allowed us to grow from each of those aforementioned categories: Solid build quality, nice levels of performance, and good overall value.

Item dimensions L x W x H: 15 x 5 x 6 inches


Voltage: 12 volts, 220 volts


Manufacturer: OSD Audio


Maximum Supply Voltage: 220 volts


Mounting Type: Surface Mount


Voltage: 12 volts, 220 volts


Maximum Supply Voltage: 220 volts


Mounting Type: Surface Mount


Number of Channels: 1


Output Power: 400 watts


Package Type Name: cardboard box


Maximum Output Power: 800 watts


Item Dimensions: 15 x 5 x 6 inches


Specification Met: Etl Rated


Manufacturer: OSD Audio


Model: SMP500DSP


Brand Name: OSD Audio


Number of Items: 1


Warranty Description: 2-Year Warranty


UPC: 819603013177


Item Type Name: Subwoofer Amplifier


Item Weight: 8 pounds


Part Number: SMP500DSP


Frequently asked questions

This product is currently out of stock. Please check back later for shipping info.

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews


  • Great sounding amp
Size: 500W DSP Style: Digital
Coupled with the OSD 12” sub and it’s a fantastic sounding amp.
Reviewed in the United States on June 12, 2026 by SHorton

  • Super delgado
Size: 500W DSP Style: Digital
Es compacto
Reviewed in the United States on June 28, 2025 by LUIS IXCOY

  • Awesome amp
Size: 500W DSP Style: Digital
I am using this to drive 2 Forza10 subs, the sound is amazing using this amp and the control settings are great, highly recommend. Can never have too much power.
Reviewed in the United States on April 7, 2021 by TM68

  • Nice class-D amp
Size: 500W DSP Style: Digital
I just wished it was WiFi controls instead of a ir-remote
Reviewed in the United States on July 3, 2021 by Mike Bohnet

  • Dead on arrival
Size: 500W DSP Style: Digital
This amp arrived dead. It would power up, lights came on, but no output to my speaker. I worked with OSD's customer service and Amazon's, and both confirmed it was dead. I returned it and went with a lower power amp from Parts Express that cost less, yet it's much larger, heavier and looks more expensive. It's performed great with zero issues. I have a feeling these OSD amps are high margin cheap junk that don't do rated power. ... show more
Reviewed in the United States on November 17, 2021 by Chris A. Johnson

  • Very nice.
Size: 500W DSP Style: Digital
Paired with the 12” in ground sub. Awesome sound!
Reviewed in the United States on July 1, 2023 by Amazon Customer

  • You get what you pay for
Size: 500W DSP Style: Digital
See the picture? You will not be getting two separate units. Besides this, it is a powerful unit. In combination with the sub-woofer being offered the sound will be awful. Don't know which one is the problem. The Sub-woofer or this pre-amp. You would think that these units which are being sold by the same distributor would be a perfect match. Not at all. Bottom line: poor sound at mid-level will have you playing with the controls hoping to get better sound. You won't. ... show more
Reviewed in the United States on April 26, 2019 by Manuel Dotel

  • Great power for a huge back yard with 2-12s
Size: 500W DSP Style: Digital
Love this amp, powers my 2 OSD 12s easily
Reviewed in the United States on May 28, 2022 by Amazon Customer

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