In this review, we will be comparing 606 S2 AE and Q350, two Passive Bookshelf speakers from Bowers Wilkins and KEF.
Let's have a brief look at the main features
of B&W 606 S2 and KEF Q350 first before getting into our more
detailed comparison.
| Key Specs | B&W 606 S2 | KEF Q350 |
|---|
| Design | 2-way | 2-way |
|---|
| Uni-Q driver | — | 11th Generation Uni-Q |
|---|
| Tweeter | 1" Decoupled Double Dome | 1" Dome |
|---|
| Woofer | 6.5" Continuum | 6.5" Aluminum |
|---|
| Frequency response | 52-28k Hz | 63-28k Hz |
|---|
| Sensitivity | 88 dB | 87 dB |
|---|
| Impedance | 8 ohms | 8 ohms |
|---|
| Power range | 30-120 watts | 10-120 watts |
|---|
| Weight | 6.90kg / 15.2lbs | 7.60kg / 16.7lbs |
|---|
| Dimensions (H x W x D) | 13-5/8" x 7-1/2" x 12-13/16"
347.0 x 191.0 x 326.0mm | 14.0" x 8.2" x 12.0"
358.0 x 210.0 x 306.0mm |
|---|
What size room are the B&W 606 S2 and KEF Q350 speakers good for?
The size of the room in which you are planning to use these loudspeakers is an important decision
factor. Here we have compared their suitability to various sizes of environments considering their size
and max power parameters:
| Listening Environment* |
B&W 606 S2 |
KEF Q350 |
| Near-field |
Poor |
Poor |
| Small Room |
Average |
Average |
| Mid-size Room |
Good |
Good |
| Large Room |
Average |
Average |
| Very Large Room |
Poor |
Poor |
(* Approximate Room sizes: Small < 100sq. ft / 9 m2,
Mid-size: 100-220 sq. ft / 9-20 m2, Large 220-400 sq. ft / 20-36 m2, Very Large: >
400 sq. ft / 36 m2.
Average Floor Height: 9" / 2.7m. Typical room sizes differ from country to country, and the actual
listening experience changes depending on floor height, room shape, surface materials, listening
position, speaker locations, etc.)
The sections below take each area in turn: drivers, frequency response, physical size and what you get in the box.
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through our links. As an Amazon Associate I earn from qualifying purchases.
Drivers
Both 606 S2 AE and Q350 are 2-way speakers.
B&W 606 S2KEF Q350
TweeterWoofer
Front view, drawn to scale - cabinets and drivers share one scale, so sizes are directly comparable. Hover a driver for its size.
| Driver |
B&W 606 S2 |
KEF Q350 |
|
Driver Setup
|
2-way
|
2-way
|
|
Tweeter
|
1-inch
|
1-inch
|
|
Midrange
|
- |
- |
|
Woofer
|
1 x 6.5-inch
|
1 x 6.5-inch
|
606 S2 AE features a 1" Aluminum Decoupled Double Dome Tweeter and 1 x 6.5" Continuum Woofer. On the other hand, the Q350 features a 1" vented aluminum Dome Tweeter and 1 x 6.5" Aluminum Woofer with a Crossover frequency at 2500Hz.
Frequency Response
606 S2 AE has a frequency range of 52-28k Hz whereas Q350 has a frequency range of 63-28k Hz. With a minimum frequency of 52Hz, the 606 S2 AE can go significantly deeper on the low side and provide stronger bass compared to the Q350's min frequency of 63Hz.
The graph below depicts how these two speakers compare with the max, min and average Low Frequency values of other speakers in the Bookshelf class in our database.
Low Frequency
Bookshelf Speakers
Neither pair reaches down to 20Hz, the usual definition of full-range, which is normal for speakers of this size. If you want the bottom octave for movies or bass-heavy music, add a subwoofer to whichever you choose. Visit our Powered Subwoofers section to find out more about the available options.
Impedance and Sensitivity
606 S2 AE and Q350 have the same Impedance of 8 ohms but where they differ is the sensitivity levels. 606 S2 AE sensitivity is rated at 88 dB and the Q350's is at 87 dB. This 1 dB difference makes the B&W 606 S2 a more sensitive speaker compared to KEF Q350, hence will play louder with the same amount of watts.
Sensitivity
Bookshelf Speakers
Power Range
Power
range is the range of input power in watts RMS that a loudspeaker is designed to handle. Staying
within that range gives nominal performance; driving the speaker beyond its maximum wattage can damage it.
Both handle the same maximum of 120 watts RMS, though 606 S2 AE is rated 30-120 watts and Q350 10-120 watts.
Note that higher power handling does not make a speaker louder: that depends mainly on
sensitivity and impedance. The calculator below shows how loud each of these actually plays
on a real amplifier.
Which plays louder on your amplifier?
Starting with a popular amplifier — change it to the one you own, or any you are
considering, and watch both numbers move.
Input Type and Bi-Amping / Bi-Wiring
606 S2 AE features Binding post posts which make bi-amping or bi-wiring possible. Q350 has a Post which doesn't feature bi-amping/bi-wiring.
B&W 606 S2's Binding post terminals allows Bi-amping or bi-wiring
KEF Q350's Post terminals
Cabinet Type and Port Position
Both 606 S2 AE and Q350 have rear firing ports. Rear ported speakers generally need more room between the backside of the speaker and the wall compared to sealed and front/bottom ported speakers. Placing the speakers too close to the walls may cause the bass to sound boomy.
If you are limited in space and can't get the speakers away from the backwall, check our Speakers with Front Firing Ports page.
Physical Specs
The size of a speaker can sometimes be an important decision factor due to space constraints or in some cases purely for esthetic reasons. In this section, we are going to compare B&W 606 S2's and KEF Q350's external dimensions. B&W 606 S2 has external dimensions of 347.0 x 191.0 x 326.0mm (13-5/8 x 7-1/2 x 12-13/16inch) whereas KEF Q350 has external dimensions of 358.0 x 210.0 x 306.0mm (14.0 x 8.2 x 12.0inch).
B&W 606 S2 is 19mm narrower and 11mm shorter than KEF Q350 but it is also 20mm deeper.
Below you can see the front view size comparison of B&W 606 S2 and KEF Q350 in scale.
Comparison image of B&W 606 S2 and KEF Q350 Size and External Dimensions
Base Surface Area Comparison
Base surface area of a loudspeaker may become a determining factor when the space in your room or desk is limited.
The base surface area of the B&W 606 S2 is approximately 622.7cm2 / 96.5inch2 and base area of the KEF Q350 is approximately 642.6cm2 / 99.6inch2. The 606 S2 AE requires 3% less surface area than the Q350 which gives it a small advantage on placement in tight spaces.
Here is another comparison that shows both speakers on a BDI Octave Media Cabinet, next to a standard size amplifier and turntable in scale:
Size Comparison image of B&W 606 S2 and KEF Q350 on a Media Console
Weight Comparison The weight of a loudspeaker can become an important factor if you need to move and reposition the unit often. Weight of a speaker can also "sometimes" be an indicator of the rigidity of the enclosure and the quality of the internal components used. The B&W 606 S2 weighs 6.90kg / 15.2lbs and the KEF Q350 weighs 7.60kg / 16.7lbs. This makes the Q350 10% heavier than the 606 S2 AE.
Here is a comparison of how 606 S2 AE and Q350's weights compare with the average, max and min weights in Passive Bookshelf class.
Weight
All Bookshelf Speakers
What's in the Box of B&W 606 S2?
Here are the items that are included inside the box of 606 S2 AE:
- 2 Bookshelf loudspeakers
- 2 Grilles
- 2 Two-piece foam port plugs
- 8 Self-adhesive rubber feet
- 4 Jumper-straps (pre-installed)
- Manual
- Bowers & Wilkins brochure
- Warranty Information
What's in the Box of KEF Q350?
Here are the items that come with the Q350:
- 2 Bookshelf loudspeakers
- 2 Foam port plugs
- 8 Self-adhesive rubber feet
- Owner's Manual
- Warranty Registration Card
 Sensitivity |
88 dB
vs
87 dB
|
Play louder with same amount of amplification power |
 Low Frequency Response |
52 Hz
vs
63 Hz
|
Generates deeper bass |
 Bi-Amping and Bi-Wiring |
Yes
vs
No
|
Allows bi-amping and bi-wiring connections |
 Height |
347mm
vs
358mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
622cm2
vs
642cm2
|
Takes less floor space |
 Price per pair* |
750USD
vs
999USD
|
costs less (*prices may change depending on the seller, location and time) |
| General |
Bowers & Wilkins 606 S2 Anniversary Edition |
KEF Q350 |
| Brand |
Bowers Wilkins |
KEF |
| Speaker Type |
Bookshelf speakers |
Bookshelf speakers |
| Power Range |
30-120 watts |
10-120 watts |
| Sensitivity |
88 dB |
87 dB |
| Impedance |
8 ohms |
8 ohms |
| Impedance |
3.7 ohms |
3.7 ohms |
| Frequency Response |
52-28k Hz |
63-28k Hz |
Drivers |
|
|
| Woofer Quantity |
1 |
1 |
| Woofer Size |
6.5" |
6.5" |
| Woofer Composition |
Continuum |
Aluminum |
| Woofer Surround Material |
Rubber |
Rubber |
| Tweeter Size |
1" |
1" |
| Tweeter Type |
Decoupled Double Dome |
Dome |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
No |
| Crossover Frequency |
n/a |
2500Hz |
| Firing Direction |
rear |
rear |
Physical Specs |
|
|
| Height |
347.0mm (13.7") |
358.0mm (14.1") |
| Width |
191.0mm (7.5") |
210.0mm (8.3") |
| Depth |
326.0mm (12.8") |
306.0mm (12") |
| Weight |
6.90kg (15.2lbs) |
7.60kg (16.7lbs) |
| Enclosure |
Bass Reflex |
Bass Reflex |
| Finish |
MDF/Vinyl |
MDF/Vinyl-wrapped |
| Available Colors |
Matte Black, Matte White, Oak, Red Cherry |
Black, Walnut, White |
| Mounting Bracket |
No |
No |
| Recommended Stand Height |
24-26" |
18-24" |
| Grille |
Yes |
Yes |
| Moisture Resistancy |
No |
No |
Connections |
|
|
| Biamp Inputs |
Yes |
No |
Other |
|
|
| Parts Warranty |
5 Years |
5 Years |
| Labor Warranty |
5 Years |
5 Years |
A generation apart: B&W 606 S2 is the newer design, against a 2016 model. Newer is not automatically better, but the older one is more likely to be discounted or near run-out.
| Area | Better | Why |
|---|
| Bass |
A |
B&W 606 S2 digs deeper - 52Hz against 63Hz. |
| Amplifier needs |
evenly matched |
Similar sensitivity (88dB vs 87dB) - both want much the same power. |
| Headroom |
evenly matched |
Similar power handling (120W vs 120W). |
| Size |
depends |
Similar cabinet size - neither is easier to fit. |
| Expandability |
A |
B&W 606 S2: bi-amping. |
| Price |
B |
KEF Q350 is cheaper - $750 against $999, about 25% less. |
A B&W 606 S2
B KEF Q350
depends neither is better in the abstract - it turns on your room, placement or how you will use them.
Only specs published for both speakers are judged; anything missing on either side is left out rather than guessed.
Which should you choose?
The usual trade-off: B&W 606 S2 measures better, KEF Q350 costs about 25% less. Whether that gap is worth the money is the call only you can make - and in a normal room it is often smaller than the numbers suggest. If a subwoofer is in your plans, the bass gap largely stops mattering - you would be crossing over above 63Hz anyway, which makes the cheaper KEF Q350 much easier to justify.
And remember what a spec sheet cannot show: how each looks in your room and whether the finish suits it, what dealer support and warranty are like where you live, and how they actually sound to you. If you can hear them first - ideally with your own music - that will tell you more than any number above.