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Compact black amplifier with front panel controls and rear connection terminals

Dayton Audio

Dayton Audio SA70 70W Amplified Subwoofer

SKU CH-Q5RX-4GMQZ

Compact amplified subwoofer module delivering 70 watts RMS into 4 ohms with auto-on, variable 40-180 Hz crossover and line or speaker-level inputs

  • TypeAmplified Subwoofers
  • 70 watts RMS into 4 ohms delivers strong bass
  • 45 watts RMS into 8 ohms ensures clean low-frequency output
  • Auto-on circuit activates instantly when audio signal is detected
  • Variable low-pass crossover from 40 Hz to 180 Hz tailors frequency response
  • Line-level and speaker-level inputs connect to any audio system

Compact Amplified Subwoofer

The Dayton Audio SA70 is a 70W amplified subwoofer designed for car audio and desktop upgrades. Its built-in Class-AB amplifier delivers 45 watts RMS into 8 ohms and 70 watts RMS into 4 ohms from a 120 VAC supply. The sealed rear enclosure and auto-on circuit simplify installation in tight spaces.

Ideal for Single-Subwoofer Upgrades

This unit suits owners adding one compact subwoofer or a tactile transducer to an existing system. Line-level and speaker-level inputs connect to factory or aftermarket head units without extra adapters. Builders needing multi-channel amplification or more than 70 watts for larger drivers should consider separate components.

Variable Low-Pass Crossover Control

A continuously adjustable second-order low-pass filter sets the crossover point anywhere from 40 Hz to 180 Hz. This single control matches the subwoofer roll-off to main speakers and room acoustics, making it the specification that decides whether the SA70 integrates cleanly with your system.

Highlights

  • 70 watts RMS into 4 ohms delivers strong bass
  • 45 watts RMS into 8 ohms ensures clean low-frequency output
  • Auto-on circuit activates instantly when audio signal is detected
  • Variable low-pass crossover from 40 Hz to 180 Hz tailors frequency response
  • Line-level and speaker-level inputs connect to any audio system

Specifications

TypeAmplified Subwoofers

Questions about this item

How do I know the SA70 is delivering its rated 70 watts into a 4-ohm load after installation?

At 0.2 % THD the amplifier produces 70 watts RMS into 4 ohms; listen for clean, undistorted bass at normal listening levels and verify the auto-on LED illuminates when signal is present.

What cables and accessories are included with the SA70 and what must I provide separately?

The unit includes the amplifier with sealed rear enclosure and auto-on circuit; you must supply 120 VAC mains power, line-level or speaker-level signal cables, and a subwoofer or tactile transducer rated for 4 or 8 ohms.

Which crossover setting should I choose between 40 Hz and 180 Hz for my compact subwoofer?

Start near 80 Hz for typical compact subwoofers, then adjust the variable 2nd-order low-pass crossover between 40 Hz and 180 Hz until bass blends smoothly with your main speakers.

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