Seismix 1 Mk7

Krix Seismix 1 Mk7 Active Subwoofer

Compact 8-Inch Active Subwoofer for Movies, Music & Gaming

The Krix Seismix 1 Mk7 is a compact active subwoofer designed to add greater depth, impact and low-frequency energy to movies, music and gaming systems.

Featuring a 200mm (8-inch) low-frequency driver and a high-efficiency 350-watt RMS Class D amplifier, the Seismix 1 Mk7 delivers controlled bass performance while maintaining a compact footprint suitable for living rooms, apartments, bedrooms, home offices and games rooms.

With an in-room frequency response of 25Hz–200Hz and maximum output of 116dB SPL, it provides substantial low-frequency reinforcement without requiring the space of a larger cinema subwoofer.

Highlights & Benefits

• 200mm (8-inch) woofer — delivers powerful low-frequency reinforcement from a compact cabinet.

• 350W RMS Class D amplifier — provides efficient, controlled power for movies and music.

• 700W maximum instantaneous power — additional headroom for demanding bass transients.

• 25Hz–200Hz in-room response — adds depth and weight across music, movies and games.

• 116dB maximum SPL — strong output capability for everyday entertainment spaces.

• Bass-reflex enclosure — uses a down-firing vent for extended low-frequency performance.

• Continuously variable phase control — adjustable from 0° to 180° for easier system integration.

• Adjustable low-pass filter — variable from 50Hz to 200Hz with bypass option.

• Stereo RCA inputs — straightforward connection to compatible amplifiers and AV receivers.

• USB-C power output — provides 5V/1A for an optional wireless receiver.

• Automatic signal sensing — switches to standby after approximately 15 minutes without an input signal.

• Compact dimensions — designed for flexible placement near walls, in corners or within custom cabinetry.

• Australian made — engineered and manufactured by Krix in Australia.

Powerful 8-Inch Low-Frequency Driver

The Seismix 1 Mk7 uses a nominal 200mm (8-inch) doped paper cone driver engineered specifically for low-frequency reproduction.

Its 38mm (1.5-inch) voice coil is wound on a high-powered aluminium former and paired with a vented magnet assembly, helping the driver handle demanding bass passages while maintaining controlled movement.

350-Watt RMS Class D Amplification

An integrated high-efficiency Class D amplifier module supplies 350 watts RMS, with maximum instantaneous power rated at 700 watts.

By integrating the amplifier directly with the subwoofer driver, Krix can optimise the system for efficient low-frequency reproduction while eliminating the need for a separate external subwoofer amplifier.

Deep Bass Down to 25Hz

The Krix Seismix 1 Mk7 provides an in-room frequency response of 25Hz–200Hz, adding the low-frequency foundation that smaller speakers can struggle to reproduce on their own.

For movies, this means greater weight and depth during soundtrack effects. For music, the Seismix 1 can reinforce bass instruments and low-frequency ambience, while gaming systems benefit from greater impact and immersion.

Bass-Reflex Design with Down-Firing Vent

The Seismix 1 Mk7 uses a bass-reflex enclosure with a down-firing vent.

The down-firing configuration allows flexible positioning around the room while helping the compact enclosure produce deeper bass than would typically be expected from its dimensions.

Flexible Placement for Everyday Rooms

At just 375mm high, 295mm wide and 320mm deep, the Seismix 1 Mk7 is designed to integrate easily into everyday entertainment spaces.

Krix specifically recommends it for areas such as:

• Living rooms

• Apartments

• Bedrooms

• Home offices

• Games rooms

• Custom cabinetry

Its compact down-firing design also allows placement close to walls or in room corners.

Adjustable Low-Pass & Phase Controls

For easier integration with your main speakers, the Seismix 1 Mk7 includes a continuously variable 0°–180° phase adjustment.

The low-pass filter can be adjusted between 50Hz and 200Hz or bypassed completely when crossover management is handled by an AV receiver or external processor.

Automatic Signal-Sensing Power

The Seismix 1 Mk7 includes signal-sensing automatic power control.

When no input signal is detected, the subwoofer waits approximately 15 minutes before switching to standby, providing convenient everyday operation without requiring manual power control each time the system is used.

Optional Wireless Receiver Support

A built-in USB-C connection providing 5V/1A can be used to power an optional wireless receiver.

This gives installers additional flexibility when a conventional wired subwoofer connection is difficult or undesirable.

Australian Designed & Manufactured

The Krix Seismix 1 Mk7 is engineered and manufactured in Australia by Krix, a South Australian loudspeaker company that has been producing speakers since 1974.

Its combination of compact dimensions, integrated amplification and flexible controls makes it an excellent choice for customers wanting meaningful bass performance without introducing an oversized subwoofer into their room.