Dayton Audio SA25 25W Subwoofer Plate Amplifier

Name: Dayton Audio SA25 25W Subwoofer Plate Amplifier
Brand: Dayton Audio
SKU: 300-782
Price: 49.98 USD
Availability: InStock
Rating: 4.3 (136 reviews)

Dayton AudioPart # 300-782

Model: SA25

Read 136 Reviews | 1143 Questions, 2492 Answers or

25 Watt-Class AB 100 Watt-Class AB 100 Watt-Class D 250 Watt w/DSP-Class D 250 Watt-Class AB 300 Watt-Class D 500 Watt w/DSP-Class D 500 Watt-Class AB 1000 Watt-Class AB

The Dayton Audio SA25 is a compact 25 W RMS plate amplifier engineered for small subwoofer systems where space is limited but performance still matters. With flexible input options, adjustable crossover control, and reliable protection circuitry, it delivers clean, controlled bass in a convenient, easy-to-install package. Ideal for custom enclosures, nearfield systems, or compact home theaters, the SA25 brings big-amp functionality to small sub designs.

Key Features

Compact 25 W RMS amplifier for small subwoofer systems
Line-level and speaker-level input options
Variable 60 Hz–180 Hz low-pass crossover
Speaker-relay protection to prevent power-off thumps
With a Dayton Audio 5 year warranty, it’s more than a guarantee, it’s a promise

Overview

Dayton Audio SA25 25W Subwoofer Plate Amplifier

Perfect for powering compact subwoofers

The SA25 is the perfect solution for adding bass reinforcement to smaller speaker systems or custom installations. Its compact form factor allows it to fit easily into tight spaces such as desktop subwoofers, furniture-integrated systems, or compact home theater enclosures. Despite its small size, it provides the power and control needed to give your system a solid low-frequency foundation—ideal for music, gaming, or media playback where tight, responsive bass enhances the experience.

A continuously variable low-pass filter ranging from 60 Hz to 180 Hz makes it easy to dial in the perfect crossover point between your main speakers and subwoofer. The amplifier’s 25 W RMS output is conservatively rated and capable of driving 4 Ω loads with low distortion, maintaining clarity even at higher levels. Both line-level and speaker-level inputs make integration simple with virtually any audio source or amplifier, giving you flexibility for DIY or retrofit projects.

Designed with longevity in mind, the SA25 includes a speaker-relay circuit that eliminates the pops and thumps common when powering off or changing inputs, protecting your driver from unnecessary stress. A compact 6¼″ × 6¼″ plate size makes mounting straightforward, while Dayton Audio’s five-year warranty backs every unit with dependable support. The SA25 combines clean sound, practical features, and long-term reliability in one small but capable subwoofer amplifier.

Specifications:

Output channels: 1
Output power (8 ohms): 15 watts RMS @0.1% THD
Output power (4 ohms): 25 watts RMS @ 0.2% THD
Frequency response: 20 to 200Hz
SNR, A-weighted: 90 dB

Inputs: 2 x RCA, 2 x High (Speaker) level
Power requirements: 120 VAC
Dimensions: 6-5/16" x 6-5/15" x 2-9/16"
Cutout dimensions: 5-1/4" x 5-1/4"
Weight: 2 lbs.

3D-Printable Rear Enclosure

Dayton Audio now offers a 3D printable rear enclosure plate designed specifically for the SA25 amplifier. This precision-fit back plate provides an airtight seal to prevent air leaks that can compromise subwoofer performance, while occupying less than 0.035 cubic feet—only 60 cubic inches—of internal volume. To achieve the best strength and acoustic isolation, we recommend printing with 2 wall layers and 40% infill. The result is a low-profile, airtight design that preserves cabinet volume, simplifies installation, and gives your subwoofer a clean, professional finish.

3D-printable rear enclosure

Product Details
Brand	Dayton Audio
Model	SA25
Part Number	300-782
UPC	844632016370
Unit of Measure	Each
Weight	2.5