KEF Q350 Speaker Review

Testing The KEF Q350 Speakers

The KEF Q350 speakers offer impressive sound and stylish looks at a competitive price. The company was founded in 1961 in the UK. Thanks to patents and continuous development, the sound and performance of KEF speakers are absolutely convincing.

Key Features of the KEF Q350

The KEF Q350 is a compact, high-performance bookshelf speaker that combines sleek design with impressive sound capabilities. Below are its core technical specifications:

• Recommended amplifier power: 15 – 120 Watts
• Frequency response: 63 Hz – 28,000 Hz
• Sensitivity: 87 dB
• Nominal impedance: 8 Ohms
• Tweeter (woofer) diameter: 25 mm
• Bass/midrange driver diameter: 165 mm
• Crossover frequency: 2,500 Hz

These features make the Q350 a strong performer in small to medium-sized rooms, delivering balanced detail across the frequency spectrum.

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Design

Design

The KEF Q350 is constructed from MDF panels with a durable vinyl coating and features a rear-firing bass-reflex port. It uses gold-plated/nickel-plated connectors for secure and high-quality signal transfer.

• Dimensions: 210 × 358 × 306 mm
• Weight: 7.6 kg

From the very first glance, it’s clear that the Q350 offers a cleaner, more modern design compared to its predecessor, the Q300.
Notable updates include:

• Removal of the chrome strip from the front baffle
• Replacement of grille mounting holes with magnetic grille fixings for a seamless look

Available in two color combinations:

• Black or white enclosure
• Black or silver Uni-Q drivers

Note: The grilles are sold separately.

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Visual Appeal with Technical Precision

The Q350 speakers boast an elegant and minimalist aesthetic, free of unnecessary embellishments. Only a small KEF logo adorns the top of the enclosure, maintaining the clean lines.

However, the polished finish is prone to scratches, so care is advised when moving or cleaning the speakers.

At the heart of the design is the 25 mm vented aluminum dome tweeter, mounted concentrically within a 165 mm aluminum mid/bass driver. This Uni-Q driver array, a KEF hallmark, is supported by a waveguide structure that ensures uniform sound dispersion throughout the room.

The Uni-Q drive is the latest development from the company, which comes from KEF’s high-end Reference range. This driver features a tube that has been designed to reduce resonances and deliver more accurate, clearer sounds. The driver is located on the front of the speaker, which the manufacturer claims reduces standing waves, while the reflex port is located on the back of the speaker. This placement is also designed to eliminate distortion in order to produce deeper, cleaner basses.

It is designed to improve the quality of high frequencies. Further changes have also been made to the shape of the mid/bass cone to reduce distortion.
The previous model had dual cabling, this has also been changed and the Q350 speakers now have a single cable. The wall brackets used on the old Q300s have been removed for a nicer appearance.

testing the sound

The KEFs provided a balanced, clean sound with intense bass tones. The rehearsal took place in a music room in a newly built family house. The room was designed and built with acoustic considerations in mind, using the latest construction and insulation materials and finishes. Once the room was furnished, it was of course necessary to use special acoustic products to achieve the perfect result. Sound absorbing panels and diffusers were installed on the walls, and thick, densely woven acoustic carpets were laid on the floor.

If the room is used primarily for stereo music listening – as in this case – the acoustic treatment must be careful not to over-damp the room! To avoid this, let an acoustic professional manage the room.

When we tested the speakers, we were quite surprised at the intense bass notes the KEF Q350 could deliver. We experienced rich, detailed, characterful soundings with a wide stage image, basically in all musical styles. The sound from the speakers filled the room with an airy, open sound. The highs were also flawless, beautiful and distinct. Even with harder styles of music, the highs remained even.

For some tracks, we felt that the KEF could have been more dynamic and energetic, as the speaker’s performance sometimes seemed overly refined. At higher volumes, the sound was not distorted and the detail was maintained. In fact, the refined sound of the speakers was less enjoyable at lower volumes.

Paired with a pair of Yamaha A-S301 stereo amplifiers, the speaker pair complemented the Q350’s sound nicely and added a little oomph to the sound. Also make sure that the speakers are positioned correctly. Because of the rear reflex port, it is generally not advisable to place the speakers directly next to the wall. With the KEF Q350, however, we found that it’s a good idea to place them close to the wall (but not directly next to the wall, of course!) for a slightly more solid sound. The basses were more powerful. (But the sense of spaciousness was slightly reduced with this setting.)

Final Verdict

For a bookshelf speaker, the KEF Q350 truly packs a punch.
It earned our praise for its:

• Refined, clear, and detailed sound
• Tight, accurate bass
• Flawless high and mid-range performance

We were especially impressed by the sense of spaciousness it delivered—an immersive soundstage that fills the room.

That said, for certain musical genres, we would have appreciated a bit more dynamic energy.
Visually, the speaker is clean and elegant, though the cabinet is somewhat delicate, so it needs to be handled with care.

Aside from that, this is one of the best mid-range speakers we’ve tested in its category—both in sound quality and design sophistication.