Audio T Verdict
The IsoAcoustics Aperta Sub XL provides a simple and beautifully engineered isolation solution for larger subwoofers weighing up to 72.6kg.
Its patented directional isolators reduce the transfer of low-frequency energy into the floor, helping prevent suspended floors, furniture and other parts of the room from joining in with the subwoofer.
The design also reduces vibrational energy reflecting from the supporting surface back into the subwoofer cabinet. This can help clean up bass smear and make individual low-frequency notes sound tighter and more clearly defined.
Its low-profile aluminium frame fits beneath the flat centre section of many subwoofer cabinets without interfering with their existing corner feet. Four carpet discs are included for installation on suitable carpeted floors.
Correct sizing and orientation remain important. The subwoofer should be the same size as or larger than the Aperta Sub XL, its weight must remain within the 72.6kg limit and the directional isolators should be aligned with the movement of the subwoofer driver.
IsoAcoustics Aperta Sub XL Subwoofer Isolation Stand
The IsoAcoustics Aperta Sub XL brings the company’s patented isolation technology to larger and heavier subwoofers.
Measuring 368mm wide, 406mm deep and only 37mm high, it supports compatible subwoofers weighing up to 160lb or 72.6kg.
The rigid sculpted-aluminium frame incorporates four directional IsoAcoustics isolators and is supplied ready to position beneath the subwoofer without requiring assembly.
One Stand Is Supplied
The Aperta Sub XL package contains one complete isolation stand and four carpet discs.
It is intended to support one compatible subwoofer. The subwoofer itself is not included.
Designed for Larger Subwoofers
The Aperta Sub XL was developed for subwoofers that exceed the size or 36.3kg capacity of the standard Aperta Sub.
Its larger frame provides a 368 × 406mm footprint and supports substantially heavier cabinets weighing up to 72.6kg.
The subwoofer must still have a suitable flat underside and stable weight distribution. Overall cabinet dimensions alone do not confirm compatibility.
Patented IsoAcoustics Isolation
A subwoofer creates substantial mechanical energy as its driver moves forwards and backwards.
When the cabinet is coupled directly to a floor, some of that energy can transfer into the supporting structure and cause floorboards, furniture and other objects within the room to vibrate.
The Aperta Sub XL provides a controlled mechanical connection that reduces this transfer while continuing to support the subwoofer securely.
Reducing Room Rattle
Low frequencies can excite lightweight floors, cabinets, doors and loose objects throughout the listening room.
Reducing the amount of mechanical energy entering the floor can help minimise these unwanted resonances and allow the listener to hear more of the subwoofer itself rather than the surrounding structure.
Isolation cannot eliminate every room rattle, especially where the rattle is caused by airborne bass pressure, but it can substantially reduce vibration travelling through the supporting surface.
Structure-Borne and Airborne Vibration
Structure-borne vibration travels mechanically through the floor and surrounding construction. This is the vibration the Aperta Sub XL is designed to reduce.
Airborne low-frequency energy can still cause loose doors, windows and objects to rattle, so the room may require additional attention where problems remain.
Reducing Reflections into the Cabinet
Vibrational energy can also reflect from a hard supporting surface and travel back into the subwoofer cabinet.
IsoAcoustics identifies these returning vibrations as a potential cause of muddy bass and reduced low-frequency definition.
Managing this interaction can help the subwoofer reproduce bass notes with clearer starts, stops and changes in pitch.
Tighter and More Clearly Defined Bass
Subwoofer isolation is not intended to remove the power or physical impact of the low frequencies.
The aim is to retain the subwoofer’s output while reducing unwanted energy transfer, structural resonance and bass smear.
Depending on the subwoofer, floor and room, listeners may hear greater bass definition, improved timing and cleaner integration with the main speakers.
What Improvements Might You Hear?
- Tighter bass with clearer leading edges
- Better separation between individual bass notes
- Reduced floor and furniture vibration
- Less low-frequency smear
- Clearer integration with the main speakers
- Reduced disturbance in neighbouring rooms
The result will depend on the subwoofer, room construction, floor type, positioning and existing isolation arrangement.
Directional Isolation
The patented IsoAcoustics isolators are directional rather than designed to move equally in every direction.
Their internal geometry resists sideways deflection and oscillation while aligning the isolation with the front-to-back movement of the subwoofer driver.
Correct orientation is therefore an important part of installation.
Align the Stand with the Subwoofer Driver
For a front-firing subwoofer, position the Aperta Sub XL with the IsoAcoustics logo facing forwards in the same direction as the driver.
For a side-firing subwoofer, rotate the stand so that its directional isolators remain aligned with the direction in which the driver moves.
Front-Firing Subwoofers
With a front-firing subwoofer, the IsoAcoustics logo should normally face the listener in the same direction as the driver.
The stand may be rotated through 180 degrees if you prefer the logo to remain hidden, as the isolators will remain on the same front-to-back axis.
It should not be turned sideways beneath a front-firing design because this would place the isolators across the direction of driver movement.
Side-Firing Subwoofers
The Aperta Sub XL is also suitable for compatible side-firing subwoofers.
In this application, the isolation stand should be turned sideways so that its directional isolators align with the direction in which the side-mounted driver travels.
The logo may therefore face towards one side of the room rather than towards the listener.
Low-Profile Aluminium Frame
The Aperta Sub XL uses a rigid sculpted-aluminium frame finished in black.
Its height of only 37mm raises the subwoofer sufficiently to provide isolation without dramatically changing the cabinet’s position or visual impact.
The open shape helps it fit between the existing feet fitted near the corners of many subwoofer cabinets.
Works Around Existing Subwoofer Feet
The stand is intended to contact the flat underside of the subwoofer cabinet between its existing feet.
This avoids the need to remove compatible factory feet and allows the Aperta Sub XL to sit directly beneath the centre section of the cabinet.
The feet must not prevent the cabinet from resting properly on the isolation stand or cause the subwoofer to rock.
Measure the Flat Underside
Measure the part of the subwoofer cabinet that will actually make contact with the Aperta Sub XL.
Do not rely only on the subwoofer’s maximum external width and depth, particularly where the cabinet has a narrow plinth, curved underside or unusually positioned feet.
Subwoofer Size and Overhang
IsoAcoustics recommends that the subwoofer should be the same size as or larger than the isolation stand.
A few inches of cabinet overhang on each side can be acceptable where the cabinet remains stable and the weight is safely distributed over the stand.
The Aperta Sub XL should not project substantially beyond the edges of a smaller subwoofer cabinet.
72.6kg Maximum Capacity
The official maximum supported load is 160lb or approximately 72.6kg.
This limit applies to one complete Aperta Sub XL supporting one subwoofer.
The published limit should not be exceeded, and the weight should be distributed evenly across the stand rather than concentrated on one edge or isolator.
Check the Subwoofer Weight Before Ordering
Use the subwoofer’s net product weight rather than its packed shipping weight.
Where the cabinet is very close to the maximum capacity or has unusual weight distribution, use the IsoAcoustics Product Selection Wizard or ask Audio T for advice.
Fixed Height with No Tilt Adjustment
The Aperta Sub XL has a fixed 37mm height and does not provide tilt or height adjustment.
Tilt adjustment is included on the standard Aperta speaker stands because bookshelf speakers may need to be aimed towards seated ear level.
A subwoofer does not require the same tweeter alignment, allowing the Sub XL to use a lower and simpler fixed-height structure.
Installation on Hard Floors
On wood, laminate, tile, stone and other suitable hard surfaces, the Aperta Sub XL can normally be placed directly on the floor.
The floor must be level, stable and capable of supporting the combined weight of the subwoofer and isolation stand.
Any dirt or grit should be removed before installation to avoid instability or damage to a delicate surface.
Four Carpet Discs Included
Four carpet discs are supplied for installation on suitable carpeted floors.
The discs provide a firm connection through the carpet to the flooring beneath, giving the directional isolators a more stable foundation.
They are particularly useful with thicker carpet and underlay that might otherwise allow the stand to move or rock.
Are the Carpet Discs Always Required?
No. They are intended for carpeted installations and are not normally required when the Aperta Sub XL sits securely on a suitable hard floor.
Use them where they provide a more stable connection through the carpet to the floor beneath.
Delivered Ready to Use
The Aperta Sub XL is supplied as one assembled isolation stand.
There are no separate frame sections or height tubes to construct before normal use.
Once compatibility has been confirmed, installation involves positioning the stand correctly and carefully lowering the subwoofer onto it.
Installing the Aperta Sub XL
- Confirm the subwoofer’s net weight
- Measure the flat underside of the cabinet
- Confirm that the existing feet will clear the frame
- Check that the floor is stable and level
- Fit the carpet discs where required
- Align the stand with the direction of driver movement
- Ask another person to help with a heavy subwoofer
- Carefully lower the subwoofer onto the stand
- Confirm that the cabinet sits evenly and securely
- Reconnect the power and signal cables
- Check that no cable pulls against the cabinet
- Recheck the subwoofer level and position
Use Two People for Heavy Subwoofers
A compatible subwoofer may weigh more than 70kg.
Do not attempt to lift or position a heavy cabinet alone. Follow the subwoofer manufacturer’s handling instructions and protect both the equipment and floor during installation.
Recheck the Subwoofer Setup
The Aperta Sub XL raises the subwoofer by 37mm and changes its mechanical connection with the room.
After installation, recheck the subwoofer level, crossover frequency, phase, output level and listening position.
Small adjustments may be required because the reduction in structural vibration can alter the amount and character of bass heard within the room.
Subwoofer Isolation and Neighbour Disturbance
Reducing structure-borne energy can help limit the amount of vibration travelling through floors and into adjoining rooms or properties.
This can be particularly valuable in flats, terraced homes, upper-floor rooms and buildings with suspended timber floors.
The stand cannot prevent airborne bass from travelling through walls and ceilings, so listening level and room construction will continue to affect neighbour disturbance.
Suitable for Music and Home Cinema
The Aperta Sub XL can be used beneath compatible subwoofers within stereo hi-fi, home cinema and multipurpose entertainment systems.
In a music system, clearer low-frequency definition can help the subwoofer integrate more naturally with the main speakers.
In a cinema system, reduced structural resonance can make effects feel more controlled without removing their scale and impact.
Aperta Sub XL or Aperta Sub?
Choose the Aperta Sub When
- The subwoofer weighs no more than 36.3kg
- A 265 × 290mm support area is sufficient
- The smaller 33mm-high frame suits the cabinet
- The subwoofer has a relatively compact footprint
- The smaller model is confirmed by the product wizard
Choose the Aperta Sub XL When
- The subwoofer weighs up to 72.6kg
- A larger 368 × 406mm frame is required
- The cabinet is too large for the standard model
- The existing feet suit the wider open-frame design
- The larger model is confirmed by the product wizard
The IsoAcoustics Aperta Sub provides the same broad isolation principle in a smaller format for compatible subwoofers weighing up to 36.3kg.
Aperta Sub XL or OREA?
Choose the Aperta Sub XL When
- A complete one-piece platform is preferred
- The subwoofer fits its fixed footprint
- Simple installation is important
- Carpet discs are required
- The subwoofer weighs up to 72.6kg
Choose OREA When
- Individual isolator positions are required
- The cabinet shape does not suit the fixed frame
- The isolators can sit directly beneath the chassis
- A lower-profile individual solution is preferred
- The correct quantity and model suit the load
The IsoAcoustics OREA Series uses individual isolators that can be positioned beneath compatible speakers, subwoofers and audio components.
Not Intended for Ordinary Standmount Speakers
The Aperta Sub XL is specifically designed for subwoofers and does not include the tilt adjustment provided by IsoAcoustics’ conventional Aperta speaker stands.
For bookshelf, standmount and centre-channel speakers, use the appropriate IsoAcoustics Aperta speaker stand.
Safety and Stability
The subwoofer must remain level and stable after it has been placed on the Aperta Sub XL.
Do not use the stand if the cabinet rocks, slips, overhangs unsafely or rests on only part of the frame.
Power cables, signal leads and wireless adapters should be arranged so that they do not pull the subwoofer towards one side.
Do Not Use an Unstable Combination
The Aperta Sub XL cannot correct an unsuitable cabinet shape, uneven underside or unsafe supporting floor.
Use the IsoAcoustics Product Selection Wizard below or contact Audio T if there is any uncertainty about fit, weight distribution or compatibility.
FIND THE RIGHT PRODUCT FOR ALL YOUR ISOLATION NEEDS USING THE SELECTION WIZARD BELOW:
IsoAcoustics Products and Audio T Guides
Key Features
- Isolation stand for larger subwoofers
- Supports up to 160lb or 72.6kg
- Patented IsoAcoustics isolation technology
- Directional isolator design
- Reduced mechanical energy transfer
- Reduced supporting-surface vibration
- Reduced low-frequency reflections
- Potentially tighter bass response
- Potentially improved bass definition
- Can help reduce room rattle
- Can help reduce neighbour disturbance
- Rigid sculpted-aluminium frame
- Low-profile 37mm height
- 368mm width
- 406mm depth
- Black finish
- Suitable for compatible front-firing subwoofers
- Suitable for compatible side-firing subwoofers
- Designed to fit between existing corner feet
- No removal of compatible factory feet required
- Fixed height
- No tilt adjustment
- No assembly normally required
- Suitable for hard floors
- Four carpet discs included
- Suitable for thick carpet when correctly installed
- One complete stand supplied
- One stand supports one subwoofer
- Integrated Product Selection Wizard
Frequently Asked Questions
What does the Aperta Sub XL do?
It isolates a compatible subwoofer from its supporting surface, reducing mechanical vibration transfer and vibrational energy reflecting back into the cabinet.
Can it improve bass quality?
It may produce tighter, more clearly defined bass by reducing supporting-surface resonance and low-frequency smear.
Can it reduce floor vibration?
Yes. It is designed to reduce structure-borne energy travelling from the subwoofer into the floor.
Will it stop every object in the room rattling?
Not necessarily. It reduces mechanical energy transfer, but airborne bass pressure can still excite loose doors, furniture and objects.
Can it reduce disturbance for neighbours?
Reducing structure-borne vibration can help, especially on suspended floors or in flats, although airborne low frequencies may still travel through the building.
How much weight can it support?
It supports one compatible subwoofer weighing up to 160lb or approximately 72.6kg.
Why do some descriptions say 72.5kg?
IsoAcoustics sometimes rounds the conversion to 72.5kg. Its current specification table gives 72.6kg, with both figures representing 160lb.
How large is the stand?
It measures 368mm wide, 406mm deep and 37mm high.
How many stands are supplied?
One complete Aperta Sub XL isolation stand is supplied.
Are carpet discs included?
Yes. Four carpet discs are included.
Does it require assembly?
No normal frame assembly is required. It is supplied ready to position beneath a compatible subwoofer.
Is it available in silver?
No. IsoAcoustics lists the Aperta Sub Series in black only.
Does it have height adjustment?
No. Its height is fixed at 37mm.
Does it have tilt adjustment?
No. Subwoofers do not require the ear-level alignment needed by bookshelf speakers.
Can it be used on a hard floor?
Yes. It can normally be placed directly on a stable and level hard floor.
Can it be used on carpet?
Yes. The four included carpet discs provide a stronger connection through suitable carpet to the flooring beneath.
Can it be used with a front-firing subwoofer?
Yes. Position the stand with the IsoAcoustics logo facing in the same direction as the front-mounted driver.
Can it be used with a side-firing subwoofer?
Yes. Rotate the stand so that its directional isolators align with the movement of the side-mounted driver.
Can I turn the logo towards the back?
Yes. With a front-firing subwoofer, the stand may be rotated through 180 degrees to hide the logo while maintaining the correct axis.
Will it work with a down-firing subwoofer?
IsoAcoustics specifically lists compatibility with front-firing and side-firing designs. Use the Product Selection Wizard or ask Audio T to confirm other cabinet arrangements.
Does the subwoofer need to be larger than the stand?
IsoAcoustics recommends that the subwoofer should be the same size as or larger than the stand.
Can the subwoofer overhang the stand?
A few inches of overhang on each side can be acceptable if the cabinet remains stable and its weight is distributed safely.
Do I remove the original subwoofer feet?
Not normally. The frame is shaped to sit beneath the flat cabinet base without interfering with feet positioned near the corners.
What should I measure before ordering?
Check the subwoofer’s net weight and measure the flat underside that will actually make contact with the isolation stand.
What is the difference between Aperta Sub and Sub XL?
The standard Aperta Sub measures 265 × 290 × 33mm and supports up to 36.3kg. The Sub XL measures 368 × 406 × 37mm and supports up to 72.6kg.
Can I use it under a normal loudspeaker?
It is designed specifically for subwoofers. Use the standard Aperta Series for bookshelf, standmount and centre-channel speakers.
How do I know whether it fits my subwoofer?
Enter the subwoofer model into the IsoAcoustics Product Selection Wizard above or contact Audio T with its dimensions and weight.
Why Buy From Audio T?
- Specialist subwoofer isolation demonstrations
- Subwoofer weight and sizing checks
- Aperta Sub and Sub XL comparisons
- Driver-orientation guidance
- Hard-floor and carpet setup advice
- Subwoofer positioning assistance
- Crossover, phase and level setup guidance
- Stereo and home cinema system advice
- Comparison with OREA isolation products
- Home demonstrations where available
- Ongoing system and setup support
Contact your local Audio T store to confirm whether the IsoAcoustics Aperta Sub XL is the correct isolation solution for your subwoofer, floor and listening room.