Everything that decides whether a slat wall looks and sounds great: the core, the wood, the felt, the size, and the price. Plain English, no upsell.
For most feature walls, a veneered-MDF acoustic slat panel in oak, around 24 in × 94.5 in on a felt backing, is the sweet spot. It is stable, good-looking, softens echo, and goes up with adhesive and a few screws. Spend up for solid wood, wider slats, or walnut only when you want the upgrade and the room's humidity is steady. Not sure how many you need? Run the panel calculator first.

Acoustic slat panels do two jobs at once. They add warm, architectural texture to a flat wall, and the felt behind the slats softens the room's echo. That combination, on a panel a competent DIYer can hang in an afternoon, is why the slat wall became the defining wall treatment of the moment. Before you buy, three things decide whether yours looks premium or cheap: the core, the wood, and the felt.
The core is the body of the panel that the slats are cut from or mounted to. It drives cost, weight, and how the panel handles humidity.

The veneer species sets the whole mood of the wall.
Whatever the species, look for a matte or satin finish over high gloss. Gloss shows dust and reads cheaper. And confirm the finish is a real wood veneer, not a printed foil wrap, which is the biggest tell between a panel that looks like wood and one that only looks like wood in the listing photo.
The felt panel behind the slats is what makes these "acoustic." It absorbs some sound and cuts the echo in a room, which is why a slat wall makes a space feel calmer, not just look better. Two honest points to set expectations:
If sound is a real priority, look for the panel's absorption rating and treat it as a bonus on top of the looks, rather than a substitute for proper acoustic panels.
The common panel is roughly 24 inches wide by 94.5 inches tall (600 by 2400 mm). That height is a touch under a standard 8-foot wall, so most feature walls are a single row with a small trim at the top. Taller ceilings need a second row and a planned horizontal seam. Half-height 24 by 48 inch panels exist for wainscot looks. Slat width and the gap between slats also vary, and wider slats read more contemporary.
Slat walls earn their keep as a single feature: behind a bed as a headboard wall, behind a mounted TV, along a hallway or stairwell, or as a fireplace surround. They also work on ceilings for drama. What they are not is an every-wall treatment, since the whole point is one focal surface that the rest of the room plays off.

Most acoustic slat panels run roughly $30 to $90 each. A typical feature wall of 8 to 20 panels lands around $300 to $1,500 in materials, before adhesive, screws, and trim. Solid wood, walnut, and wider slats sit at the top of that range; veneered MDF in oak sits at the bottom. The other cost to plan for is finishing: edge trim or molding to cap the exposed sides and top, plus construction adhesive and screws.
Slat panels sort into four tiers. Match the tier to your room, your budget, and how much you care about solid wood versus a convincing veneer.
The do-it-all pick: real oak veneer on MDF, 24 × 94.5 in, black felt. Best balance of look, price, and availability.
Size your wall →Lowest cost per panel for a big wall on a tight budget. Check the veneer is real wood, not foil.
Size your wall →Walnut veneer or solid wood for a genuinely high-end feature wall. Best in a humidity-stable room.
Size your wall →Wainscot-height coverage with fewer panels and lighter install, easier to finish and reverse.
Size your wall →For most feature walls, MDF with a real wood veneer is the best balance: stable, affordable, consistent. Solid oak or walnut looks and ages better but costs more and can move with humidity. Go solid only where the upgrade is worth it and the room's humidity is steady.
The common size is about 24 in wide by 94.5 in tall (600 × 2400 mm) on a felt backing. Half-height 24 × 48 in panels exist for wainscot-height looks, and slat and gap widths vary by product.
Yes, modestly. The felt backing absorbs some sound and softens echo, which is why they are called acoustic panels. They cut reverberation inside a room rather than block sound between rooms, so treat the acoustics as a bonus on top of the looks.
Most run roughly $30 to $90 per panel, so a feature wall of 8 to 20 panels is about $300 to $1,500 in materials, plus adhesive, screws and trim. Solid wood and walnut sit at the top of that range.