Air Coils · Metal Membranes

Two cabinets. Zero resonance.

Name: Unitra ZGB-401 Bookshelf Speakers
Brand: Unitra Audio
SKU: ZGB-401-01
Price: 4999.0 CAD
Availability: InStock

A double-layer MDF cabinet and a 3rd-order crossover built from air coils and polypropylene capacitors, tuned for a wide, natural soundstage over sonic showmanship.

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The cabinet

Typ ZGB-401 Zakład Warszawa

One box inside another. A plug for the port.

The ZGB-401 is two MDF shells, one inside the other, with real veneer on the outside. The port is there for extension; the supplied plug closes it for smaller rooms. Behind the drivers the crossover is third-order, air-core coils and metallised polypropylene. 10.5 kg each, on a 380 mm cabinet.

Walls: Two layers of MDF, one box inside another
Loading: Bass reflex, with a port plug for sealed use
Drivers: 1-inch aluminium-magnesium dome, 6-inch aluminium-ceramic midwoofer
Crossover: Third order at 2.4 kHz, air-core coils, metallised polypropylene
Finish: Black ash or American walnut veneer, black fabric or Polish linen grille

Built for Bi-Wiring

Unitra KG-40 Speaker Cables

The ZGB-401's dual binding posts are built for bi-wiring, and a premium cable makes that capability worth using. The KG-40 is sized to match the pair without becoming the weak link between amplifier and driver.

$899.00

Technical specifications

Configuration	2-way, bass-reflex with removable port plug for closed-box use
Tweeter	1" aluminium-magnesium dome
Midwoofer	6" aluminium-ceramic membrane
Crossover	3rd-order passive, 2.4kHz, air-core coils and metallised polypropylene capacitors
Frequency response	60Hz–23kHz (±3dB)
Sensitivity / Impedance	87dB / 4Ω (minimum 3.5Ω)
Power handling	60W RMS
Dimensions / Weight	380 x 210 x 280mm, 10.5kg per speaker
Finishes	Black ash or American walnut veneer, black fabric or Polish linen grille

What amplifier power does the ZGB-401 need?

The speakers are rated to handle 60W RMS at a nominal 4Ω impedance (minimum 3.5Ω), and their 87dB sensitivity means a modest integrated amplifier will drive them comfortably in a normal listening room.

Can I convert the ZGB-401 to a sealed cabinet?

Yes. The bass-reflex port includes a removable plug, so you can run the speakers ported for a fuller, room-filling bass response or plugged for a tighter, more controlled sealed-box alignment.

What are the drivers made from?

A 1-inch aluminium-magnesium dome handles the tweeter duties, paired with a 6-inch aluminium-ceramic midwoofer membrane in a 2-way configuration crossing over at 2.4kHz.

What finishes are available?

The cabinet is finished in real wood veneer, offered in Black Ash or American Walnut, with a choice of black acoustic fabric or Polish linen grille.

Are these speakers bi-wireable?

Yes, each speaker has dual binding posts on the rear panel supporting bi-wire or bi-amp connection.

How heavy is each speaker, and does that matter?

Each speaker weighs 10.5 kg, a result of the box-in-box double-MDF cabinet construction. The mass is there to reduce panel vibration and resonance; the spec sheet is a side effect.

About the Unitra ZGB-401 Bookshelf Speakers

Big, Expressive Sound From an Elegant Bookshelf

The Unitra ZGB-401 Bookshelf Speakers are designed for listeners who want full-bodied, expressive sound from a compact, space-friendly enclosure. A carefully engineered cabinet with a bass-reflex design blends precision, warmth and dynamic punch, while real wood-veneer finishes in Black Ash or American Walnut make them as much a design object as a loudspeaker. Modern sound in a classic form.

An Advanced Two-Way System

The ZGB-401 uses a precise two-way crossover to deliver a linear, faithful sound. Its high-frequency transducer is designed to improve directivity for a wide, stable stereo image, while the low-midrange driver's aluminium-ceramic membrane combines high rigidity with minimal mass — the recipe for fast, clean, low-distortion sound. It's a speaker that disappears into the music.

Tune It to Your Room

A supplied bass-reflex port plug lets you adapt the ZGB-401 to different acoustic conditions and placements — leave the port open for maximum low-end extension, or fit the plug for tighter bass in smaller or more reflective rooms. Built from two layers of MDF for a rigid, inert cabinet and dressed in real wood veneer, these are speakers built to last and to impress.

Why You'll Love the ZGB-401

Advanced two-way system with a precise crossover for linear sound
Aluminium-ceramic low-midrange membrane — rigid, light and low-distortion
High-frequency transducer engineered for improved directivity
Supplied port plug to tune bass to your room
Real wood veneer (Black Ash or American Walnut) over a rigid double-MDF cabinet

Frequently Asked Questions

Are the ZGB-401 sealed or ported?

They use a bass-reflex (ported) design, and include a port plug so you can adapt the bass loading to your room and placement.

What finishes are available?

Real wood veneer in Black Ash or American Walnut, with a grille in black acoustic fabric or natural linen.

What drivers do they use?

A two-way configuration: a high-directivity high-frequency transducer and a low-midrange driver with a rigid, lightweight aluminium-ceramic membrane.

ZGB-401 Technical Specifications

Configuration	2-way, bass-reflex (with supplied port plug)
Low-midrange driver	Aluminium-ceramic membrane
Cabinet material	Two layers of MDF (total thickness 3/4")
Finishes	Real wood veneer: Black Ash or American Walnut
Grille	Black acoustic fabric or natural linen
Dimensions (H x W x D)	380 × 210 × 280 mm
Weight	2 x 10.5 kg (pair)