---
product_id: 445555033
title: "SPA300-D 300 Watt Class-D Subwoofer Plate Amplifier"
brand: "dayton audio"
price: "$456.74"
currency: USD
in_stock: true
reviews_count: 13
category: "Dayton Audio"
url: https://www.desertcart.us/products/445555033-spa300-d-300-watt-class-d-subwoofer-plate-amplifier
store_origin: US
region: United States of America
---

# 300W RMS power output Class-D efficient amplification Customizable crossover & gain SPA300-D 300 Watt Class-D Subwoofer Plate Amplifier

**Brand:** dayton audio
**Price:** $456.74
**Availability:** ✅ In Stock

## Summary

> 🎵 Unleash the bass, own the room — power meets precision!

## Quick Answers

- **What is this?** SPA300-D 300 Watt Class-D Subwoofer Plate Amplifier by dayton audio
- **How much does it cost?** $456.74 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/445555033-spa300-d-300-watt-class-d-subwoofer-plate-amplifier)

## Best For

- dayton audio enthusiasts

## Why This Product

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

## Key Features

- • **Smart Energy Saver:** Auto on/off feature powers the amp only when needed, cutting energy waste without sacrificing performance.
- • **Power that Moves You:** Delivers a robust 300W RMS with peaks up to 600W for deep, dynamic bass that fills your space.
- • **Plug & Play Versatility:** Dual RCA inputs make integration seamless with any audio source—upgrade your system without hassle.
- • **Sleek & Efficient Design:** Class-D amplification ensures high power with minimal heat and compact size—perfect for modern setups.
- • **Tailor Your Bass Experience:** Variable gain, crossover, and phase controls let you fine-tune sound to your room’s unique acoustics.

## Overview

The Dayton Audio SPA300-D is a compact, high-efficiency Class-D subwoofer plate amplifier delivering 300W RMS at 4 ohms with peak power up to 600W. It features versatile RCA inputs, customizable sound controls including gain, crossover, and phase, plus an auto on/off function for energy efficiency. Ideal for professionals and audiophiles seeking powerful, tunable bass integration in a sleek, space-saving design.

## Description

Product description Dayton Audio SPA300-D 300 Watt Class-D Subwoofer Plate Amplifier The Dayton Audio SPA300-D high-efficiency subwoofer plate amp packs big-amp features into a compact chassis that is ideal for installation into cabinets that can't accommodate bulky old-style amps. Key Features 300W RMS Output @ 4 ohms Switchable 6 dB @ 30 Hz bass boost Class-D output stage for highly efficient, well defined output Manual and Auto on/off modes for compatibility with any automated system Variable gain, crossover point and switchable phase controls optimize room integration Switchable 120/240V input voltage The plate amplifier that packs a punch! The Dayton Audio SPA300-D high-efficiency subwoofer plate amp packs big-amp features into a compact chassis that is ideal for installation into cabinets that can't accommodate bulky old-style amps. A Class-D topology makes it small, but with the same output capability as a traditional amplifier topology. We've included everything that you need to connect the amp to your system and get maximum performance! Key Specs Channels: 1 Power Output @ 4 ohms (RMS): 300 Watts Power Output @ 4 ohms (MAX): 600 Watts Frequency Response: 20Hz - 200Hz Inputs: 2x RCA Inputs Outputs: 1x Powered Output Additional Info USB Power Out Attach a Dayton Audio WLS System to the USB output and enjoy a wireless connection from your stereo system Variable Crossover Maintain a smooth transition from your full-range speakers with a variable low-pass filter. Bass Boost Get maximum performance from smaller drivers and enclosures with a switchable 6dB boost at 30Hz. Auto-On When no signal is present, the SPA300-D will shut itself off until you need it most! Class-D Excellence The efficient class-D design keeps size and weight to a minimum while providing maximum power to your driver. SPA-D Amplifiers are perfect for subwoofer duty due to their high efficiency and low noise volume at lower frequencies making amplification selection easier than ever. Specifications

Review: Well packaged - Came in very protective packaging, probably would survive an Ace Ventura delivery. Fit perfectly with wood adapter I built for my Polk PSW505 which are apparently notorious for failures. Drives subwoofer well. Way more cost effective than a replacement polk RF5050-4 plate amp. I have done minimal testing but so far seems to be performing well with no distortion at normal use levels. Will update if any problems arise.
Review: good replacement - I had an old expensive subwoofer in my system. When it broke I was debating sending it for repair, which seems to be ridiculous expensive. A newer model would be even more expensive. Since the problem was with the electronic I also did not want to waste the chassis and the speaker itself. So I stumbled over this subwoofer plate amplifier. Since this one is only a fraction of the cost as any other options I had, I gave it a try. By simply removing the old amplifier and mounting the new one ( needs a small frame I built ) it worked like a charm. Even with the 300W rating it creates a lot of clear sounding bass. This is a perfect replacement when you are on a low budget. It has all the knobs you need to tune and integrate it into your audio system. Requires a bit calibration to seamlessly work in your audio setup. It runs also from 120-240 Volts in case you live in Europe. I'm a happy customer now, every penny well spent.

## Features

- High-Power Output: Delivers 300W RMS at 4 ohms, with a peak power of 600W, ensuring robust and dynamic performance
- Efficient Class-D Amplification: Utilizes Class-D topology for reduced size, weight, and exceptional power output
- Versatile Connectivity: Features 2x RCA inputs for easy integration with various audio sources
- Customizable Sound: Offers variable gain, crossover point, and switchable phase controls for optimal room integration
- Auto On/Off Functionality: Automatically powers on/off based on input signal, ensuring energy efficiency

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B09SJMHH9R |
| Best Sellers Rank | #39,584 in Electronics ( See Top 100 in Electronics ) #229 in Audio Component Amplifiers |
| Brand Name | Dayton Audio |
| Customer Reviews | 4.2 out of 5 stars 125 Reviews |
| Global Trade Identification Number | 00848791008221 |
| Item Dimensions | 11 x 9 x 5 inches |
| Item dimensions L x W x H | 11 x 9 x 5 inches |
| Manufacturer | Dayton Audio |
| Material Type | Metal |
| Maximum Output Power | 600 Watts |
| Maximum Supply Voltage | 240 Volts (AC) |
| Minimum Supply Voltage | 115 Volts (AC) |
| Model | SPA300-D |
| Mounting Type | Surface Mount |
| Number of Channels | 1 |
| Output Power | 300 Watts |
| Package Type Name | Box" or "Rigid Packaging |
| Part Number | SPA300-D |
| Specification Met | 40hz - 200hz |
| UPC | 848791008221 |
| Voltage | 240 Volts |

## Product Details

- **Item dimensions L x W x H:** 11 x 9 x 5 inches
- **Manufacturer:** Dayton Audio
- **Maximum Supply Voltage:** 240 Volts (AC)
- **Minimum Supply Voltage:** 115 Volts (AC)
- **Voltage:** 240 Volts

## Images

![SPA300-D 300 Watt Class-D Subwoofer Plate Amplifier - Image 1](https://m.media-amazon.com/images/I/61KkO6MgPXL.jpg)
![SPA300-D 300 Watt Class-D Subwoofer Plate Amplifier - Image 2](https://m.media-amazon.com/images/I/81vw-nEYlJL.jpg)
![SPA300-D 300 Watt Class-D Subwoofer Plate Amplifier - Image 3](https://m.media-amazon.com/images/I/71pa0ahU-3L.jpg)

## Questions & Answers

**Q: Is this rated for 2 ohm loads?**
A: The instructions only refer to 4 ohm loads and the sub I'm driving is 4 ohms. I'm not sure about 2 ohms working without blowing up the unit.

**Q: do you get the power cord and can i use 4om speaaker**
A: The power cord is included.    It is rated at 300 watts for a 4 ohm speaker, so I would think it supports a 4 ohm speaker.

**Q: What are the cut out dimensions? Two very different sets of dimensions are included in the product description.**
A: meant to add that the overall plate is about an inch wider and an inch taller -  so 8 inches high by about 7 inches wide ( not exact ).

**Q: Does the plate amp come with its 110 Vac -120 Vac power cord?**
A: It does come with the power cord.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Well packaged
*by E***D on April 27, 2026*

Came in very protective packaging, probably would survive an Ace Ventura delivery. Fit perfectly with wood adapter I built for my Polk PSW505 which are apparently notorious for failures. Drives subwoofer well. Way more cost effective than a replacement polk RF5050-4 plate amp. I have done minimal testing but so far seems to be performing well with no distortion at normal use levels. Will update if any problems arise.

### ⭐⭐⭐⭐⭐ good replacement
*by D***R on March 1, 2024*

I had an old expensive subwoofer in my system. When it broke I was debating sending it for repair, which seems to be ridiculous expensive. A newer model would be even more expensive. Since the problem was with the electronic I also did not want to waste the chassis and the speaker itself. So I stumbled over this subwoofer plate amplifier. Since this one is only a fraction of the cost as any other options I had, I gave it a try. By simply removing the old amplifier and mounting the new one ( needs a small frame I built ) it worked like a charm. Even with the 300W rating it creates a lot of clear sounding bass. This is a perfect replacement when you are on a low budget. It has all the knobs you need to tune and integrate it into your audio system. Requires a bit calibration to seamlessly work in your audio setup. It runs also from 120-240 Volts in case you live in Europe. I'm a happy customer now, every penny well spent.

### ⭐⭐⭐⭐⭐ A LOT of bass (once it finally got here).
*by J***S on October 22, 2024*

Got this today, as a replacement for a blown amp on a 17 year old REL T2. Had a lot of time waiting, so I already had a 1" thick back fitted to the cabinet.. Installed amp, and spent a bit of time getting it set up with KEF LSX powered speakers. Did not need the +6 boost at 30hz. Used the KEF app to adjust the x-over points and any trim. WAY more bass than the REL "200 watt" amp. High pass at 70hz; low pass at 65. +1 on bass boost (+2-10 just not needed). That was it, so far. Sounded good! Plug & play, basically. Now, complaints...I ordered this 9 days ago. I am not complaining about not getting 1 day shipping, or 2 day shipping. And I understand that things can go awry. But all last week, Amazon was still advertising "2 day shipping" on this unit. I theoretically could have re-ordered it on Wednesday, received it Friday, and just sent back this unit when it came in (the following Monday). It appears they were promising to new customers while reneging on deals with existing customers. 2 chats yielded promises to "expedite" the order, but that didn't happen. I hope nothing goes wrong with this amp, because I don't want to go into Amazon shipping hell again. Update after a couple of days…on some modern pop, too much bass at +1. Rock, blues, most jazz great. Reggae 👍. Organ music is big, and low volume anything is good. I can adjust on the fly for pieces with too much bass, so thumbs up on the amp. Update 2 weeks later...still too much bass, so -2 on the volume, high pass still at 70hz, but low pass at 60hz. Sounds very good! One last comment, one month in…the Auto On/Off is slow to come on if the music is quiet-ish or lacking much bass. I now leave it On all the time; instructions say that’s costing me 8.5 watts. This seems like something that should be properly engineered out by now.

## Frequently Bought Together

- Dayton Audio SPA300-D 300 Watt Class-D Subwoofer Plate Amplifier
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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-06-06*