What the maker puts in writing
- “SLIM WALL-MOUNT DESIGN: Features a sleek 1.38” slim profile and easy wall-mount bracket, blending seamlessly into any space”
- “CLEAR, BALANCED AUDIO: 5.25” woofer and 0.5” Mylar dome tweeter deliver natural mids and crisp highs with a 100Hz-20kHz frequency response”
- “POWERFUL SOUND: 40W RMS per speaker (80W per pair) and 120W peak power per speaker”
- “DURABLE CONSTRUCTION: ABS cabinet and shielded grill resist dust and impact”
- “EASY INSTALL & CLEAN LOOK: Molded wire grooves, spring-loaded terminals, and built-in brackets make installation simple with wires tucked neatly out of sight”
Thirty-five millimeters is the product
1.38 inches deep, with a 5.25 inch woofer behind it.
The driver itself can be made shallow — a flat or short-throw magnet assembly does that. What cannot be made shallow is the air behind it.
Bass output depends on the volume of air the cone displaces and on the compliance of the air trapped in the cabinet. Compress a very small volume and it behaves as a stiff spring, pushing the cone back and raising the frequency below which the speaker simply stops.
Which is why the very next bullet publishes 100 Hz – 20 kHz.
That is an honest sequence: the claim, then its cost, in two consecutive sentences. The two most expensive listings on this shelf — the $399 Bose and the $325-each B&W at bullet level — publish no frequency figure in their bullets at all.
And a hundred hertz is the right answer for surround duty
In any properly configured surround system the receiver’s bass management takes everything below a chosen crossover — typically 80 to 120 Hz — from all channels and routes it to the subwoofer.
So a surround speaker is only ever asked to cover midrange and treble, and a 100 Hz floor sits exactly at that boundary.
What it rules out is using these as front speakers, or running a system without a subwoofer.
JBL’s C1PRO at $239 publishes the same 100 Hz floor. B&W’s M-1 publishes 64 Hz from a 4-inch woofer in a sealed clamshell — which is why B&W claims its speaker can take “all five positions”.
The molded wire grooves are the detail that makes it work
Molded wire grooves… with wires tucked neatly out of sight.
On a speaker 1.38 in (35 mm) deep, a cable emerging from the back and running down the wall would hold the cabinet off the wall by more than the cable’s own diameter — defeating the entire point.
A molded groove in the cabinet back channels the wire sideways and down, so the speaker sits flat.
Nothing else on this shelf mentions it, and nothing else on this shelf is thin enough to need it.
But the maker’s own cheaper speaker has better fittings
| RockSlim, $64.95 | Cube, $59.95 |
|---|
| Woofer | 5.25 in | 3.5 in |
| Frequency | 100 Hz – 20 kHz | not published |
| Power | 40 W RMS, 120 W peak | 30 W RMS |
| Impedance | not published | 8 ohm |
| Terminals | spring-loaded | Euro block |
| Brackets | built-in, fixed | 360° swivel |
Spring-loaded terminals take bare wire only and weaken as the copper oxidizes. A Euro block is a removable screw clamp — what installers use, because it holds securely and can be wired at the bench rather than overhead on a ladder.
And the brackets matter more. A surround speaker mounted high on a wall fires over your head unless it can be angled down and inward. Fixed brackets cannot. The Cube’s swivel rotates in any direction.
So: better drivers and better figures here; better fixings and connectors there. Five dollars apart, and for a surround speaker going high on a wall the aiming is arguably worth more than the extra inch and three quarters of cone.
A Mylar dome is a thin polyester film: very light, so it accelerates quickly and extends high — consistent with the 20 kHz ceiling, which is a kilohertz above JBL’s and three below B&W’s.
And publishing 40 W RMS alongside 120 W peak is what makes either number readable. RMS is what the speaker takes continuously; peak is a momentary burst. The ratio here is 3:1, which is a plausible relationship for the same hardware.
Only this and the JBL publish any usable power figure — JBL’s 150 W without a qualifier, and the Cube’s 30 W RMS without a peak.
What is not published
No impedance, where the maker’s own Cube states 8 ohm, Polk states 4 and 8, and B&W states 8 in its description. That is the figure that tells you an amplifier can drive it safely.
No sensitivity, which decides how loud it plays per watt. Only B&W publishes one, at 85 dB.
No tolerance on the frequency range, so 100 Hz is a figure rather than a guarantee — every speaker produces something at its claimed limit.
1,429 g the pair and 155 × 323 × 246 mm are published, the latter a carton figure.
Prices quoted in this text were read on October 4, 2026. The live price is at the top of the page.
