Atlas Sound SM8SUB70-B – 8" Surface Mount 70V Subwoofer Black

Product Overview

The Atlas Sound SM8SUB70-B is an 8" surface-mount subwoofer with an integrated 60-watt 70.7V/100V transformer, designed to add extended low-frequency response to commercial distributed audio systems in restaurants, bars, retail environments, and similar foreground music applications. The speaker uses an 8" woofer housed in a 915 cubic inch wood enclosure with multi-angle mounting capability and fly points for ceiling suspension, allowing flexible installation positioning. An 18 dB/octave three-pole passive crossover with a 125 Hz crossover point handles frequency division without requiring external processing or a dedicated subwoofer amplifier channel. The SM8SUB70-B operates in parallel with any 70.7V commercial audio system and is also 8-ohm compatible, pairing directly with other Atlas Sound SM Series full-range surface-mount speakers.

Product Description

Adding meaningful low-frequency extension to a 70V commercial audio system is a common design challenge: most 70V line speakers roll off below 100-120 Hz, leaving music playback sounding thin in environments where audio quality is part of the customer experience. The SM8SUB70-B addresses this by providing a passive subwoofer that connects directly to the 70V line without a separate amplifier or electronic crossover network. Its 18 dB/octave three-pole passive crossover at 125 Hz handles all signal routing, and the low crossover frequency keeps localization minimal — meaning the subwoofer will not draw attention to its own position and will blend into the distributed speaker array.

The 915 cubic inch wood enclosure is a genuine low-frequency enclosure, not the small plastic boxes that masquerade as subwoofers in some distributed systems. Multi-angle mounting inserts for 1/4"-20 drop forge eyebolts allow the SM8SUB70-B to be fly-mounted from ceiling structures in addition to wall or bracket mounting. The optional SM8CBKT-B wall-mount bracket provides a clean surface-mount solution. The enclosure can be boundary-loaded against a wall or corner — a placement that increases low-frequency output by exploiting acoustic gain from adjacent surfaces, allowing maximum low end without exceeding amplifier power limits.

The input panel accepts 70.7V/100V line input and 8-ohm direct input via a barrier strip, plus a 4-pole Speak-ON for 8-ohm operation, and includes compatibility with a standard 4" square box cover for conduit-termination applications in jurisdictions requiring flex conduit for low-voltage wiring. Fuse protection on the driver prevents damage from amplifier clipping or short circuit events. The black rough-coat finish matches other SM Series surface-mount speakers for a cohesive system appearance.

Key Features

• Integrated 60-Watt 70.7V/100V Transformer — Connects directly to any 70V or 100V distributed audio line without external amplification or crossover hardware, simplifying system design and installation.
• 18 dB/Octave Three-Pole Passive Crossover at 125 Hz — High-order crossover slope at a low crossover point minimizes subwoofer localization in the listening space, blending the bass with full-range distributed speakers.
• 915 Cubic Inch Wood Enclosure — Properly dimensioned low-frequency enclosure delivers genuine bass extension rather than the limited performance of compact plastic housings.
• Multi-Angle Flyable Wood Enclosure — Multiple 1/4"-20 inserts for drop-forge eyebolts support ceiling fly-point suspension in addition to wall and bracket mounting configurations.
• Boundary-Loading Compatible — Enclosure design supports wall or corner boundary placement for acoustic gain that increases low-frequency output without additional amplifier power.
• Dual Input Options — Barrier strip input accepts 70.7V/100V and 8-ohm connections; 4-pole Speak-ON supports 8-ohm operation for direct amplifier drive in non-70V applications.
• Standard 4" Square Box Cover Compatibility — Input panel design accommodates a Raco 753 or equivalent 4" square box cover for flex conduit termination in applicable electrical code jurisdictions.
• Fuse Protection — Internal driver fuse protects against amplifier clipping and short circuit conditions that could damage the driver during extended operation.
• Optional Wall-Mount Bracket (SM8CBKT-B) — Dedicated wall-mount bracket available separately for clean surface-mount installations where fly-point suspension is not practical.

Typical Applications

• Commercial meeting space
• Multi-purpose room
• House of worship
• All-hands room

Technical Specifications

Frequently Asked Questions

Q: Does the SM8SUB70-B require a separate amplifier or crossover?

A: No. The SM8SUB70-B includes an internal 60-watt 70.7V/100V transformer and an 18 dB/octave three-pole passive crossover at 125 Hz. It connects directly to any standard 70V distributed audio line without external amplification or electronic crossover hardware.

Q: How does the 125 Hz crossover point minimize localization?

A: Bass frequencies below approximately 120-150 Hz are difficult for the human hearing system to directionally locate. By crossing over at 125 Hz, the SM8SUB70-B operates entirely in the range where listeners cannot identify the subwoofer's position, allowing it to be placed for maximum acoustic advantage rather than at the listener's ear level.

Q: What mounting options are available for the SM8SUB70-B?

A: The enclosure has multiple 1/4"-20 inserts for drop-forge eyebolts (supporting fly-point ceiling suspension), an optional SM8CBKT-B wall-mount bracket, and Omnimount-compatible insert patterns. Boundary placement against a wall or in a corner is also effective for increasing bass output.

Q: Can the SM8SUB70-B be used outdoors?

A: No. The SM8SUB70-B is not rated for outdoor use. It should be installed in climate-controlled or at minimum covered indoor environments.

Q: Which AtlasIED full-range speakers are recommended to pair with the SM8SUB70-B?

A: The SM8SUB70-B is designed to complement the Atlas Sound SM Series surface-mount speakers, including the SM8CXT-B and SM8CXT-W full-range surface-mount models, for a matched system appearance and voicing.

Q: What is the warranty on the SM8SUB70-B?

A: The SM8SUB70-B is covered by AtlasIED's standard commercial product warranty. Contact Creation Networks or AtlasIED for current warranty terms.