Sunfire ATMOS XTATM265

Ultra-compact powered subwoofer with auto room correction

  • Sunfire ATMOS XTATM265

    Angled view

  • Sunfire ATMOS XTATM265

    Alternate view

  • Sunfire ATMOS XTATM265

    Angled view

  • Sunfire ATMOS XTATM265


  • Sunfire ATMOS XTATM265

    Drivers removed to show cabinet interior

  • Sunfire ATMOS XTATM265


  • Sunfire ATMOS XTATM265

    Shown with CD for scale

  • Sunfire ATMOS XTATM265

    Side view


Our take on the Sunfire ATMOS XTATM265

by Dave Bar

Why add a powered subwoofer?

A powered subwoofer gives you bass you can feel as well as hear. Our customers love the depth and impact their subs add to music and movies. We hear comments like "it brings out sounds I didn't know existed in discs I've watched a million times." Powered subwoofers aren't just for big bass that rattles your picture frames; they can also deliver tight, accurate lows. If you haven't shopped for a powered sub in a while, you might be surprised at how small they get. Look for an ultra-compact model if you want to tuck your sub away under an end table or in a corner.

Big bass from a tiny box

Sunfire's ultra-compact ATMOS XTATM265 offers tight, powerful bass that belies its small size. This mighty mite packs 1,400 watts of power, a 6-1/2" extra-long-throw woofer, and a 6-1/2" passive radiator into a cabinet that can easily fit into even the smallest home theater, bedroom, or den. You may not see where the bass is coming from, but you'll hear natural, room-filling lows that put some excitement back into your movie nights and music listening sessions.

Sunfire ATMOS XTATM265 subwoofer with CD for scale

Sunfire packed an impressive amount of power and sophisticated processing into the ATMOS XTATM265's tiny enclosure.

Read more

Moving some serious air

One of the keys to the ATMOS's powerful performance comes courtesy of its advanced, extra-long-throw woofer with a Sunfire-designed Asymmetrical Cardioid Surround. This unique surround material uses varying wall thickness that allows the cone to move back and forth farther, and with far greater accuracy, to move lots more air than woofers of comparable size. The result is crystal-clear, high-definition bass with exceptionally high output levels.

Potent amplification tailored for your room

The sub's 1,400-watt RMS amplifier uses Sunfire's exclusive Tracking Downconverter™ power supply to delivers high levels of current with greater efficiency than conventional amps, for huge power reserves with minimal physical size and cool-running operation.

Sunfire's auto room correction technology lets you use the included calibration microphone to optimize the ATMOS's output for your specific room. Simply place the microphone in your main listening position and the sub will find just the right amount of "oomph" for your music and movies.

Versatile system integration

Line-level inputs and outputs let you easily connect this sub to most audio systems. Its variable back-panel volume, crossover, and phase controls help you fine-tune the bass to your liking. And the sub's black brushed aluminum cabinet looks right at home with almost any room decor.


  • frequency response: 30-100 Hz
  • built-in 1,400-watt amplifier (continuous power)
  • Automatic Room Equalization mode (measurement microphone included)
  • Tracking Downconverter™ power supply
  • soft-clipping circuit to prevent speaker damage
  • one extra-long-throw side-firing 6-1/2" woofer
  • one 6-1/2" passive radiator
  • continuously variable low-pass 30-100 Hz crossover
  • continuously variable phase control (0-180°)
  • rear-mounted volume, crossover, and phase control
  • signal-sensing auto on/standby mode
  • speaker-level inputs
  • line-level/LFE inputs
  • line-level outputs (85 Hz high-pass or full range)
  • slave input/output for connecting two ATMOS subwoofers
  • 12-volt DC trigger input for remote turn-on
  • anti-resonant custom feet
  • black brushed aluminum cabinet
  • 10-1/16"W x 8-5/8"H x 10-3/8"D
  • weight: 32 lbs.
  • warranty: 1 year
  • Our 60-day money-back guarantee

Hands-on research from the Crutchfield Labs (what are the Labs?)

Features and Specs
Enclosure Acoustic Suspension
Video Shielded No
Woofer Size (inches) 6 1/2
Woofer Composition Not given
Firing Direction Side
Wireless No
Preamp-Level Inputs Yes
Speaker-Level Inputs No
Speaker-Level Outputs No
Low-Pass Crossover Freq 30-100Hz
High-Pass Crossover Freq 85Hz
Phase Switch Yes
Amplifier Output (watts) ---
Frequency Response 30-100 Hz
Height (inches) 8-5/8
Width (inches) 10-1/16
Depth (inches) 10-3/8
Weight 32 lbs
Speaker Parts Warranty 1 Year
Speaker Labor Warranty 1 Year
Amplifier Parts Warranty 1 Year
Amplifier Labor Warranty 1 Year
Product Research
What's in the box?

Download owner's manual

  • Powered subwoofer
  • 6' AC power cord
  • Auto-EQ mic (w/ attached 24' cable terminated by a 2.5mm connector)
  • Mic stand
  • 2 Trim-rings
  • User's Manual
  • Quick Start Guide
  • Customer Response Card

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team — they open the box, verify contents, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.


Dual 6.5" Woofers: The Sunfire Atmos powered subwoofer incorporates two side-firing 6.5" drivers that can move back & forth approximately 5x more than a normal subwoofer. This gives it a lot of air moving capacity which allows for enormous bass performance. Even though the two drivers share the acoustic output, sometimes one driver will appear to be moving more than the other. They both move the same amount only when operating at the limit of their excursion and power output, or when bass requirements and music requirements demand maximum output from the system. Otherwise, the power is shared between the two drivers in a way that depends on the momentary amplitude and the momentary musical spectrum. It is normal for one or the other to move more or less than its mate during operation.

Asymmetrical Cardiod Surround (ACS): Sunfire engineers designed a unique Asymmetrical Cardiod Surround for these woofers. The ACS got its name because of the varying thickness of the wall of the surround from one side to the other. This unique design allows up to 1.8" of  "throw" with tight, well defined bass that combines extreme output with very low distortion and a quality of sound that is unique to Atmos.

1400W Amplifier: The power amplifier within the Sunfire powered subwoofer is capable of delivering over 1400 watts for extreme dynamic bass response without distortion.

Aluminum Cabinet: The Sunfire Atmos powered subwoofer features a heavy-duty aluminum cabinet with four integrated rubber feet. The enclosure is sealed (acoustic suspension design) for tight, accurate bass response. No grilles are provided.

Auto Room EQ: The Atmos subwoofer has an automatic equalization system which will tailor the subwoofer output to compensate for any room effects. Subwoofer performance is greatly affected by the room in which it is situated, and the positioning within the room. The room effects will boost and cut the output levels reaching your listening position. The Sunfire Atmos powered sub can automatically adjust for these room effects. It measures the actual frequency response using the supplied measurement microphone. Then it automatically compensates for peaks or dips and smoothes out the response.

Soft Clipping Circuit: A compressor circuit kicks in automatically if the input signal level reaches a level that would overload the driver. This maintains a ceiling on the output without clipping. If the input signal is driven even further, a Soft Clipping circuit is enabled to prevent driver damage.

Controls: Controls for adjusting the volume, crossover frequency and phase, allow the subwoofer to be perfectly matched to any listening environment and audio components.

  • Level: This control lets you match the output level of the subwoofer to the level of your other speakers. The subwoofer output will increase as this control is
    rotated clockwise.
  • Crossover: This control changes the high frequency cutoff point. With the control set to 100 Hz, the subwoofer will reproduce frequencies up to 100 Hz. If the control is set fully clockwise, the crossover is bypassed and the subwoofer will reproduce a wide frequency range. With the control fully counter-clock wise the subwoofer reproduces a narrow range, up to 30 Hz. Rotate the control until the bass sounds natural. If the mid-bass sounds natural but you want more low bass, turn this control down a little, then turn the Volume control up by about the same amount. This increases the low-bass output while leaving the mid-bass output the same.
  • Phase: This control changes the relative phase (0°-180°) of the subwoofer with respect to the other speakers. Use this control to help blend the subwoofer with the rest of the sys tem. This is accomplished by adjusting the control in small increments as you listen for the most bass at your listening position. As a final adjustment, readjust the Crossover Frequency and Volume controls after the Phase has been set.

Connections: A complete array of controls allow the Sunfire Atmos powered sub to be perfectly integrated with any stereo or multichannel audio system, and tuned for optimum performance in any room. All RCA inputs and outputs are gold-plated for superior signal transfer.

  • LFE/RCA Inputs: Connect these unbalanced inputs with RCA-type patch cords to the line-level outputs of your receiver or preamp. If your preamplifier or receiver has a single sub/LFE output, connect it to either input jack.
  • Line-Level Outputs: Line-level output signals are available at these RCA jacks. These outputs are active whenever a signal is hooked up to the inputs of the subwoofer. The outputs are not affected by the volume level, phase, or EQ of the subwoofer. To use the outputs, connect the preamp outputs on your preamp/receiver to the subwoofer's line-level inputs using RCA-type patch cords. Then connect a second set of patch cords from these subwoofer outputs to the line-level inputs of your main amplifier. The  Output Switch  allows the outputs to be either high-pass (85Hz) or full-range.
  • Slave Input/Output: These RCA connections simplify the hookup and operation of two Atmos subwoofers. Connect the slave output from the first subwoofer to the slave input of the second. This second subwoofer will then receive the optimum audio signals from the first, and there is no need to adjust the controls of the second subwoofer; as the audio is controlled by the controls and EQ setting of the first. The second subwoofer will not require any connections to its line-level inputs, as it receives the audio through its slave input.

Auto Turn-On/Standby: The powered subwoofer has a special power circuit which automatically turns the powered subwoofer on when a signal is fed to the loudspeaker and turns it off when there is no signal present (approximately 15 minutes).

12V Trigger Input: The trigger input can be used to automatically turn on the subwoofer from Standby mode. To do this, connect +12 VDC to the positive (+) terminal, and ground to the negative (-) terminal. Home Theater preamplifiers such as the Sunfire Theater Grand series, have matching 12 VDC Trigger outputs. When they are turned on, the subwoofer will turn on.

Placement: Although low frequencies are non-directional, factors such as room reflections, standing waves, resonance and absorption will strongly affect your subwoofer's performance. Moving the subwoofer from one location to another can have a major effect on the bass response. The Sunfire Atmos powered subwoofer is designed to be placed in a corner for optimum performance.

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1 question already asked

Can I place this in a cabinet or must it have "clear air"? I can get it in a spot where it is in contact with the floor. [ Joe G  May 16, 2014 ]
1 answer
  • I forwarded your question to an Advisor and they responded with the following: I don't see why you couldn't place the subwoofer in a cabinet. The only consideration I would have would be if the subwoofer is turned all the way up there may be some vibration from the cabinet. If you would like to discuss further you can contact an Advisor directly by phone (1-800-324-9695) or online chat. [ Krissy Staff  May 18, 2014 ]

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For a more in-depth review and enhanced detailed information on the Sunfire ATMOS XTATM265, please visit the Crutchfield website product page (/ISEO-rccbcspd/p_877ATM265/Sunfire-ATMOS-XTATM265.html ).