KEF Q350 speaker review

The KEF Q350 speakers offer stunning sound and a sleek look at a competitive price. The company was established in 1961 in the United Kingdom. Thanks to patents and continuous improvement, the sound and performance of KEF speakers is absolutely convincing.

Key Features of KEF Q350

The recommended receiver power is 15 to 120 watts, the frequency transmission is 63 to 28,000 Hz, the sensitivity is 87 dB, and the impedance is 8 Ohms. The tweeter diameter is 25 mm, the subwoofer / center speaker is 165 mm in diameter, and the crossover frequency is 2500 Hz.



The KEF Q350 is made of MDF with vinyl coating. This is a 2-way rear bass reflex speaker with gold-plated / nickel connectors. Dimensions: 210 x 358 x 306 mm, weight: 7.6 kg

At first glance, you can see how sleek and modern the design is compared to previous Q300 models. The chrome strip has disappeared from the front baffle and switched to magnetic mounting instead of the holes for mounting the grilles. Available in two colours: black or white, black or silver with Uni-Q drives. Speaker grille can be purchased separately.

The KEF Q350 speakers have an elegant and minimalist look. There is no unnecessary decoration on the cover, only the logo of the brand can be seen on the top of the speaker. Unfortunately, the brushed housing can be easily damaged, so care must be taken when moving and cleaning it.
The drive-like 25mm ventilated aluminum dome tweeter is housed on a 16.5cm aluminum midrange / bass drive. The characteristic waveguide of the tweeter helps to distribute the sound evenly.


The Uni-Q drive is the company’s latest development from KEF’s high-quality Reference series. This drive includes a tube designed to reduce resonances and provide more accurate, clearer sounds. The drive is located on the front of the speaker, which the manufacturer says reduces standing waves, while the reflex port is placed on the back of the speaker. This placement is also used to eliminate distortion in order to produce deeper, clearer bass.

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

Sound test

The KEFs provided balanced, clear sound and intense bass sounds. The rehearsal was conducted in a music room in a newly built family home. Acoustic aspects were also taken into account during the design and construction of the room, the most modern building and insulation materials and coverings were used. After furnishing the room, of course, it was necessary to use special acoustic products for the perfect result. Sound-absorbing panels and diffusers were placed on the walls, and a thick, densely woven sound deadening mats was laid on the floor.

If you use a room primarily for listening to stereo music, as in this case, care must be taken during the acoustic treatment not to overdamp the room! To avoid this, entrust the operation of the room to an acoustic specialist.

When testing the speakers, we were quite surprised at how intense depths the KEF Q350 was capable of. We experienced rich, characteristic sounds, an extensive stage scene, in every style of music. The sound of the speakers filled the space, we could hear an airy, open sound. The high ranges also sounded flawless, beautiful, and firm. Even in louder music styles, the treble remained even.

For some of the songs, we felt that KEF could be more dynamic, as the speaker production sometimes seemed overly subtle. The sound was not distorted at higher volumes, and the detail remained. Moreover, the sophisticated sound of the speakers was less enjoyable at lower volumes.

We paired the speaker pair with a Yamaha A-S301 stereo receiver, which perfectly complemented the sound of the Q350 and gave a little boost to the sound. Also, make sure that the speakers are positioned correctly. Due to the rear reflex port, it is generally not recommended to place the speakers directly next to the wall. With the KEF Q350, on the other hand, we’ve found that it’s worth placing them close to the wall (but certainly not right next to the wall!) To make the sound a little more solid. The deep ones thus became stronger. (But the sense of space is slightly reduced with this placement.)


Compared to a tripod speaker, this model is capable of really serious performance. With its sophisticated, clear, detailed sound, precise, intense bass, flawless treble and mid-range, it has won our acclaim. We were also absolutely pleased with the sense of space.

However, we would have expected a more dynamic performance than some musical styles. The exterior is clean, elegant, but unfortunately the cover is fragile. Aside from that, this type is one of the best in the mid-range speaker range we’ve tested.

Written by Róbert Polgár