Can you install speakers on a stone wall without cutting into it?

Yes, if there is any non-stone surface to mount to. On this wall the only such surface was the painted reveal between the display frame and the stone return, roughly 40 mm wide. A 21 mm-deep slim array mounts to that on keyhole fixings without touching the stone, which also makes the installation reversible. Cutting a conventional 100 mm aperture into a dressed stone face is not reversible, because the stone is the finish as well as the structure.

What is the slimmest speaker you can fit beside a TV?

XSCACE QuadCane is 21 mm deep and 43 mm wide, at 763 mm tall. Its smaller siblings go shallower still — Cane is 23 mm deep at 183.5 mm tall, Bonsai Mini 12 mm deep at 90 mm tall — but they are much shorter, so for a column running most of the height of a screen QuadCane is the one that fits the proportion.

Is a slim array better than a soundbar?

Neither is better in general; they fail in different places. A soundbar needs a horizontal shelf or a face below the screen, which a recessed display on an articulating mount or a stone mantel above a fire may not offer. A vertical pair either side of the screen gives real left and right separation that a single bar has to synthesise. A bar, on the other hand, is one object and one cable. Here the architecture decided it: there was no surface a bar could sit on.

Do slim speakers need a subwoofer?

For full-range music or film, yes. QuadCane is specified to 150 Hz at ±3 dB with a recommended crossover at 200 Hz, and no enclosure 21 mm deep will reach much lower — low-frequency extension is the price such a design pays for its depth. PsySculpt in XSCACE Studio extends the perceived low end to roughly 75 Hz by synthesising harmonics, which changes how the speaker reads on music, but it does not produce the energy a subwoofer produces and is not a substitute for one.

How far apart should speakers either side of a TV be?

Far enough that the pair subtends roughly 45 to 60 degrees at the listening position. Mounted to the reveal of a screen, a pair is usually narrower than that, which pulls the stereo image in. Floorplan Sound Simulation draws the triangle and checks the angle against that target — green when it works, amber when the pair or the seat needs to move — so the compromise is a known quantity before anything is mounted rather than a surprise afterwards.

Can slim array speakers be painted to match the wall?

QuadCane ships in matte champagne, black and white as standard, and in any RAL colour to order. The finish is anodised into the aluminium under electrical current rather than sprayed on. The grille itself is not painted on site — painting a micro-perforated grille closes the apertures and changes what the speaker does.

Does mounting a speaker close to a stone wall change the sound?

It does. A hard surface within a short distance reflects energy back toward the listener slightly later than the direct sound, which colours the response. That is a reason to prefer a vertical array here: QuadCane's 25-degree vertical dispersion puts less energy into the stone above and the hearth below than a point source would. It is managed, not eliminated, which is why early reflections are measured against the direct sound during calibration.

Why predict the coverage before installing?

Because on a wall with exactly one viable mounting position there is no second attempt. A prediction on an absolute dB scale, with absorption set per wall and the room modes drawn from the traced geometry, says whether the one available position will work before anything is drilled into a finish that cannot be patched.

Speakers for a Stone Fireplace Wall: A Case Study

Contents6 sections

A limestone feature wall, floor to ceiling. A linear gas fire at hearth level, a display recessed into a white steel frame above it, and an air-conditioning slot diffuser above that. Glazing down one side. It is a beautiful wall, and it is a wall with nowhere to put a speaker.

A limestone fireplace wall with a recessed television flanked by two white XSCACE QuadCane slim array speakers mounted vertically in the frame reveal — The pair is there in this photograph. Most people have to be told where.

The wall was the finish, not a cavity

The usual assumption behind architectural audio is that there is a void to build into — a stud bay, a ceiling plenum, a service zone behind plasterboard. Here the stone is the finish and the structure in one. There is no bay to open. Cutting a 100 mm aperture into a dressed stone face is not a reversible operation, because the thing you would be cutting through is the thing the client is paying to look at.

Three usual answers, all closed

In-wall was impossible. No cavity, and no way to make one without destroying the elevation.
A soundbar did not fit. The display sits on an articulating mount inside a recessed frame. A bar below the screen would either foul the frame's swing or sit out on the stone directly above a working fire.
Floor-standing was never available. The hearth runs the full width of the wall.

What remained was the only surface on the wall that was not stone: the painted reveal between the display frame and the stone return — a flat band roughly 40 mm wide down each side of the screen.

Daylight from a window falls across the limestone wall, with a slim white QuadCane speaker column visible against the white reveal beside the recessed television — Daylight across the stone. The column reads as part of the trim.

The only gap that was not stone

A pair of QuadCane slim arrays in white, mounted vertically in that reveal, flanking the screen. QuadCane is 763 mm tall, 43 mm wide and 21 mm deep. At that depth it sits inside the reveal rather than standing proud of it, and in white against white-painted trim the eye files it as part of the frame detail rather than as equipment.

Nothing was cut into the stone. The speakers mount to the painted reveal on QuadCane's keyhole fixings, which is also why this was reversible — a decision that matters on a wall that cannot be patched.

A slow push onto the column. Rendered from the still rather than shot handheld, so the move is smooth.

Why a column suits a wall like this

QuadCane puts sixteen drivers in a vertical line, and that geometry gives 140° horizontal by 25° vertical dispersion. The wide horizontal figure is what lets a pair mounted close together either side of a screen still cover a room — they are far nearer each other than a conventional stereo pair would be.

The narrow vertical figure is the one that earns its place here. This wall is stone above and a stone hearth below, both hard, both close, both within a metre of the speakers. A column that concentrates its output into a 25° vertical window puts less energy into those two surfaces than a point source would, which means less of what reaches the listener arrives via the stone.

Close detail of the micro-perforated grille of a white XSCACE QuadCane slim array speaker mounted against a rough limestone wall — 43 mm wide, 21 mm deep, in aerospace-grade aluminium.

What 21 mm cannot do

QuadCane runs to 150 Hz at ±3 dB, with a recommended crossover at 200 Hz. It is not a full-range speaker, and no 21 mm-deep enclosure is going to be one — Hoffman's Iron Law takes its payment in low-frequency extension, and this design pays it there deliberately so that the depth and the output can stay where they are.

So a wall like this needs a subwoofer to be a complete system. Where the subwoofer goes is its own problem in a room with a stone chimney breast, and the usual advice about corners stops being reliable.

There is one partial answer in the electronics. PsySculpt, in XSCACE Studio, synthesises harmonics of fundamentals the cabinet cannot physically reproduce, so the ear infers a fundamental that is not being played — a speaker rated to 150 Hz reads to roughly 75 Hz. It is not a bass boost, and it does not replace a subwoofer. It changes what the speaker sounds like it is doing between 75 and 150 Hz, which on a wall-mounted pair is the difference between thin and convincing on music.

How this wall was planned, controlled and calibrated

Planned

A wall with one viable mounting position and two hard reflective planes is exactly the case where a coverage prediction is worth making before anything is drilled. Floorplan Sound Simulation runs sixteen guided steps from tracing the room off the plan through to the bill of quantities; the ones that decide a wall like this are the SPL prediction and the acoustics.

The rail runs in order, because each step depends on the ones before it. For a single stereo zone on one wall, the steps that applied were:

Upload the floor plan and trace the room into its own zone.
Set the scale from a dimension already known on site.
Tag the zone. This one is Music & Multiroom rather than Home Cinema, and that single choice changes what the report produces — a combined SPL map with the imaging angle and the reflection count at the seat, rather than a page per channel group.
Set the listening position, and the screen direction.
Place the pair at their real mounting height — in the reveal, either side of the display — with QuadCane's real 140° × 25° dispersion rather than a generic pattern.
Set each wall's absorption independently: stone, glazing and plaster are three different surfaces and the model treats them as three.
Choose amplification, which carries through to the signal flow and the bill of quantities.
Read the coverage across Low, Mid and High, and check the room modes and first reflections.
Check the stereo imaging angle at the seat against the 45–60° target.
Export the bill of quantities, the report, and the private client link.

Within those steps, the four outputs that decided this wall were:

Coherent SPL prediction on an absolute dB scale, modelling real interference between the pair across Low, Mid and High bands — not a relative coverage blob.
Per-wall absorption, set independently. A glazed elevation and a stone one stop being modelled as the same surface, which on this wall is the entire point.
Axial room modes from the traced geometry, with boom and null flagged at the listening position, and first-reflection points drawn on each wall.
Stereo imaging, which checks the angle the pair subtends at the seat against the 45–60° target — the check that matters most when the two speakers are constrained to a screen's width apart.

The output is a client report and a bill of quantities per zone, and a private client link with an interactive 3D model rather than a PDF attachment. A full guide to that workflow is in the journal.

Controlled

Driven from an XSCACE DSP amplifier, the pair is configured in XSCACE Studio over the local network. Connect a QuadCane and the amplifier lists an XSCACE factory preset for that model — crossover, EQ and limiter threshold already set from the speaker's real driver and power handling — so the zone plays correctly before anything has been measured. X-Sense writes its correction live to the Xylem 2, 3 and 4 and the Root 4 while they are playing.

Calibrated

The eleven-instrument Calibration Toolkit in Studio measures what the room actually does. On a wall of this kind the measurements that decide the result are:

SPL per channel at the seat, against the design target rather than a room average.
Frequency response through the 150–200 Hz crossover region, where the pair hands over to the subwoofer.
Sub alignment — delay and polarity between the subwoofer and the pair, which is where a single sub is usually lost or won.
RT60 to ISO 3382-1, because stone and glazing make a livelier room than any model assumes. Studio refuses rather than guesses here: below an r² of 0.90 it reports no figure and tells you which way to move.
Early reflections against the direct sound — the specific thing the 25° vertical pattern was chosen to manage.

In order, on site:

Discover the amplifier on the network. Devices announce themselves, so there is nothing to pair and no address to type.
Load the QuadCane factory preset — crossover, EQ and limiter threshold already set from the model's real driver and power handling.
Set per-channel gain, delay and the 200 Hz crossover, with the curve rendering live.
Run X-Sense sweeps from up to three listening positions.
Review the fitted correction band by band before applying it.
Write the correction to the amplifier while it is playing, over the network.
Run the verification pass, which re-measures with the EQ live and overlays before, target and after.
Measure the room with the toolkit: SPL, RT60, sub alignment, polarity and early reflections.
Export, with the RP22 checklist as its own section of the client PDF.

X-Sense then fits corrective EQ from sweeps at up to three listening positions and re-measures with the correction in place, overlaying before, target and after. Where a project is held to a performance level, the CEDIA/CTA RP22 checklist judges the finished room parameter by parameter and states the verdict without softening it. The full audio calibration workflow is written up separately. A prediction that is never checked is just a drawing.

Pulling back across the wall: fire, screen, and a stereo pair you have to look for.

Daylight across the stone, and the column that reads as trim.

A limestone fireplace wall seen vertically, with a recessed television above a linear gas fire and the stone hearth below — Fire below, screen above, nothing cut into the stone.