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Rockville Cube Black review

A two-way 8 ohm wall speaker pair at 30 W RMS with 360 degree swivel brackets.

In brief

Sixty dollars for a pair with swivel brackets that rotate in any direction — which is what a surround speaker actually needs — and the better terminal block of the two Rockvilles. Key figures: Two-way 8 ohm home theater wall speaker pair with a 3.5 inch paper cone woofer and a 0.5 inch PEI tweeter rated 30 W RMS, in a 4.13 by 4.72 by 4.13 inch ABS cabinet weighing 1.32 pounds per speaker, with 360 degree swivel wall brackets, a shielded grille and Euro block terminals. Amazon.com had an offer at $60 on October 25, 2026.

What the maker puts in writing

  • “TRUE 2-WAY AUDIO PERFORMANCE: Features a 3.5” woofer with paper cone for clear mids and bass, paired with a 0.5” PEI tweeter for crisp highs, delivering superior sound compared to 1-way designs”
  • “360-DEGREE SWIVEL BRACKETS: Easy-to-install wall mounts rotate in any direction, allowing precise sound staging”
  • “Sleek 4.13” x 4.72” x 4.13” ABS cabinet weighs just 1.32 lbs per speaker… providing powerful 30W RMS output”
  • “Ideal for 2.1, 5.1, or 7.1 surround systems, these speakers pair well with subwoofers”
  • “Shielded grill protects against dust, with Euro block terminals for quick connections”

The swivel bracket is the reason to buy it

360-degree swivel brackets… rotate in any direction, allowing precise sound staging.

A surround speaker belongs high on a side or rear wall, above and behind the listener. From there it fires over your head unless it can be angled down and inward toward the seating.

A fixed bracket leaves it pointing straight across the room at the opposite wall.

The shelf, on this question:

This — 360° swivel Polk ES10, $249 — screw inserts and keyhole slots for “directional firing”: a threaded insert takes a bracket bolt and holds at any angle, where a keyhole only hangs B&W M-1, $325 each — vertical or horizontal, with an “adjustable tabletop” you aim JBL C1PRO, $239 — “included brackets”, not described Rockville RockSlim, $64.95 — “built-in brackets”, fixed Bose, $399 — nothing stated

So one of the cheapest speakers here has the most adjustable fixing.

And the Euro block is better than its own stablemate’s terminals

Euro block terminals for quick connections.

A small plastic block with screw clamps: strip the wire, clamp it in, and the block plugs into a socket on the speaker.

It is what commercial installers use, for two reasons. The clamp holds far more securely than a spring clip — which takes bare wire only and weakens as the copper oxidizes underneath. And being removable, you wire the block at the bench and plug it in at the top of a ladder, rather than fiddling with bare strands while holding a speaker overhead.

The maker’s own RockSlim at $64.95 uses “spring-loaded terminals”. At least four listings here name no terminal at all, including the $399 Bose and the $325-each B&W.

A true two-way, which the bullet is right to flag

Delivering superior sound compared to 1-way designs.

A one-way speaker has a single full-range driver doing everything. At the top of its range a cone that size beams: the treble narrows into a cone pointing straight ahead, so the balance changes as you move — which on a surround speaker, heard from off-axis almost by definition, is the wrong failure.

A two-way gives the treble its own driver. Here a 0.5 inch PEI dome, which is small but is a dome.

PEI — polyetherimide — is a stiff engineering film: light enough to accelerate quickly and rigid enough not to flex, which is the usual compromise for a tweeter at this price.

Four inches cubed, and 8 ohms published

4.13” × 4.72” × 4.13” ABS cabinet weighs just 1.32 lbs per speaker.

Genuinely a cube, and the published weight is per speaker — against a catalog figure of 3 lb (1.4 kg) for the pair.

And the 8 ohm impedance is published, which only two other listings here manage: Polk (4 and 8 ohm) and B&W (8 ohm, in its description). Impedance is what tells you an amplifier can drive the speaker safely — most receivers are rated into 8 ohms, and at 8 ohms almost anything will do.

30 W RMS is modest, and for a surround channel it is usually sufficient: surround channels in a film mix carry ambience and effects rather than the main signal, and sit several decibels below the front three.

What is not published

No frequency response. The maker’s own RockSlim publishes 100 Hz – 20 kHz; JBL publishes 100 Hz – 18 kHz; B&W publishes 64 Hz – 23 kHz.

For a surround speaker a 100 Hz floor is not the limitation it would be on a front speaker — the receiver’s bass management sends everything below about 80 to 120 Hz to the subwoofer anyway. But without a figure you cannot tell where this one stops.

No sensitivity, which decides how loud it plays per watt. Only B&W publishes it, at 85 dB, in its description.

No peak power, where the RockSlim publishes 120 W per speaker alongside its 40 W RMS — and publishing both is what makes either number readable.

No cone material for the tweeter beyond PEI, and no crossover detail.

1,361 g the pair and 338 × 185 × 145 mm are the catalog figures, the latter evidently a carton.

Prices quoted in this text were read on October 4, 2026. The live price is at the top of the page.

Buying it in the United States

Amazon.com lists this model (ASIN B07VW6VHKV) and had an offer at $60 on October 25, 2026. The price box on this page is refreshed live and takes precedence over that figure.

In its favor, and against it

Strengths

  • Swivel brackets that rotate in any direction, which is the correct fixture for a surround speaker
  • A true two-way with a real tweeter, and the impedance published, for sixty dollars a pair

Compromises

  • A 3.5 inch woofer, the smallest on this shelf, in a cabinet four inches cubed
  • No frequency response and no sensitivity, where the maker’s own RockSlim publishes a range
  • Thirty watts RMS is the lowest power rating here

Specifications

Brackets360-DEGREE SWIVEL, rotating in any direction — see the FAQ
Why that mattersA surround speaker goes high on a wall and must be aimed
Woofer3.5 in paper cone
Tweeter0.5 in PEI
ConfigurationTrue two-way, stated against one-way designs
Power30 W RMS
Impedance8 ohm
TerminalsEURO BLOCK — see the FAQ, better than the maker’s own RockSlim
Cabinet4.13 × 4.72 × 4.13 in ABS, with a shielded grille
Weight1.32 lb per speaker, published; catalog 3 lb (1.4 kg) the pair
Stated uses2.1, 5.1 or 7.1 systems, and commercial spaces
Frequency responseNot published, where the RockSlim gives 100 Hz – 20 kHz
SensitivityNot published
Peak powerNot published, where the RockSlim gives 120 W
QuantityA pair
Amazon referenceB07VW6VHKV
EAN0819216024041

What gets asked most

Why do swivel brackets matter on a surround speaker?

Because a surround speaker has to be aimed, and most wall fixings cannot do it. The bullet publishes "360-DEGREE SWIVEL BRACKETS: Easy-to-install wall mounts rotate in any direction, allowing precise sound staging." A surround speaker belongs high on a side or rear wall, above and behind the listener — and from there it is firing over your head unless it can be angled down and inward toward the seating. A fixed bracket leaves it pointing straight across the room at the opposite wall. On this shelf: Polk’s ES10 has "screw inserts and keyhole slots" for "directional firing", and a threaded insert takes a bracket bolt that holds at any angle where a keyhole only hangs. B&W’s M-1 has an "adjustable tabletop" you aim. JBL includes brackets without describing them. The maker’s own RockSlim has "built-in brackets", which are fixed. Bose states nothing.

What is a Euro block terminal, and is it better?

A removable screw block, and yes — better than what the dearer Rockville on this shelf uses. The bullet publishes "Euro block terminals for quick connections". The arrangement is a small plastic block with screw clamps: you strip the wire, clamp it in, and the block plugs into a socket on the speaker. It is what commercial installers use, for two reasons. The clamp holds far more securely than a spring clip, which takes bare wire only and weakens as the copper oxidizes underneath — and the maker’s own RockSlim at $64.95 uses exactly those "spring-loaded terminals". And being removable means you wire the block at the bench, then plug it in at the top of a ladder, rather than fiddling with bare strands while holding a speaker overhead. On a wall-mounted surround speaker that is a genuine practical advantage. At least four listings here name no terminal at all.

Is a 3.5 inch woofer enough for surround duty?

For surround specifically, usually yes — and the reason is how a surround system is configured rather than anything about the speaker. In any properly set-up system the receiver’s bass management sends everything below about 80 to 120 Hz from all channels to the subwoofer, so a surround speaker is only asked to cover the midrange and treble. A 3.5-inch cone in a four-inch cabinet can do that. What it cannot do is work as a front speaker or run without a subwoofer, and the listing does not publish a frequency response to show where it gives up. For comparison on this shelf: the maker’s own RockSlim publishes 100 Hz – 20 kHz from a 5.25-inch woofer, JBL publishes 100 Hz – 18 kHz, and B&W’s M-1 publishes 64 Hz – 23 kHz from a 4-inch woofer in a sealed clamshell — which is why B&W claims its speaker can take "all five positions".

Against the surround speakers in the same bracket

Between surround speakers at a nearby price. Shown: what they all state. A half-filled column says nothing.

Model Price Sensitivity
Rockville Cube Black $60 Not published
Rockville RockSlim Black $65 Not published
Pyle PLMR24B outdoor wall speakers, 3.5 inch, weatherproof $30 Not stated in this listing
JBL Professional C1PRO (Control 1 Pro) $240 Not published

What these surround speakers do not share

  • If price decides: Pyle PLMR24B outdoor wall speakers, 3.5 inch, weatherproof, at $30.

Who should pick this one, among surround speakers

Rear surrounds on a budget — the swivel bracket is worth more than the extra five dollars elsewhere

Sources

Specifications: the manufacturer sheet and the matching Amazon product page. Prices and availability: Keepa. Every figure on this page names its source.

The method applied to these surround speakers