In this review, we will be comparing R5 and BW 603, two Passive Floor-standing speakers from KEF and Bowers Wilkins.
Let's have a brief look at the main features
of KEF R5 and B&W 603 first before getting into our more
detailed comparison.
| Key Specs | KEF R5 | B&W 603 |
|---|
| Design | 3-way | 3-way |
|---|
| Uni-Q driver | 12th Generation Uni-Q | — |
|---|
| Tweeter | 1" Dome | 1" |
|---|
| Midrange | 5" | 6" |
|---|
| Woofer | 2 x 5.25" Hybrid Aluminum | 2 x 6.5" Paper |
|---|
| Frequency response | 58-28k Hz | 48-28k Hz |
|---|
| Sensitivity | 87 dB | 88.5 dB |
|---|
| Impedance | 8 ohms | 8 ohms |
|---|
| Power range | 15-200 watts | 30-200 watts |
|---|
| Weight | 27.30kg / 60.1lbs | 24.14kg / 53.1lbs |
|---|
| Dimensions (H x W x D) | 42-3/8" x 10-3/4" x 13-13/16"
1077.0 x 274.0 x 351.0mm | 38.7" x 7.4" x 13.3"
985.0 x 190.0 x 340.0mm |
|---|
What size room are the KEF R5 and B&W 603 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* |
KEF R5 |
B&W 603 |
| Near-field |
Bad |
Bad |
| Small Room |
Poor |
Poor |
| Mid-size Room |
Good |
Good |
| Large Room |
Good |
Good |
| 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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Drivers
Both R5 and BW 603 are 3-way speakers.
KEF R5B&W 603
TweeterMidrangeWoofer
Front view, drawn to scale - cabinets and drivers share one scale, so sizes are directly comparable. Hover a driver for its size.
| Driver |
KEF R5 |
B&W 603 |
|
Driver Setup
|
3-way
|
3-way
|
|
Tweeter
|
1-inch
|
1-inch
|
|
Midrange
|
1 x 5-inch |
1 x 6-inch |
|
Woofer
|
2 x 5.25-inch
|
2 x 6.5-inch
|
R5 features a 1" aluminum Dome Tweeter, a 5" Midrange and 2 x 5.25" Hybrid Aluminum Woofer with a Crossover frequency at 400Hz and 2900Hz. On the other hand, the BW 603 features a 1" Tweeter, a 6" Midrange and 2 x 6.5" Paper Woofer.
Frequency Response
R5 has a frequency range of 58-28k Hz whereas BW 603 has a frequency range of 48-28k Hz. With a minimum frequency of 48Hz, the BW 603 can go significantly deeper on the low side and provide stronger bass compared to the R5's min frequency of 58Hz.
The graph below depicts how these two speakers compare with the max, min and average Low Frequency values of other speakers in the Floor-standing class in our database.
Low Frequency
Floor-standing 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
R5 and BW 603 have the same Impedance of 8 ohms but where they differ is the sensitivity levels. R5 sensitivity is rated at 87 dB and the BW 603's is at 88.5 dB. This 2 dB difference makes the B&W 603 a more sensitive speaker compared to KEF R5, hence will play louder with the same amount of watts.
Sensitivity
Floor-standing 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 200 watts RMS, though R5 is rated 15-200 watts and BW 603 30-200 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
Both R5 and BW 603 features dual binding post speaker terminals for bi-amping or bi-wiring.
KEF R5's Binding post terminals allows Bi-amping or bi-wiring
Cabinet Type and Port Position
Both R5 and BW 603 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.
KEF R5 Port
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 KEF R5's and B&W 603's external dimensions. KEF R5 has external dimensions of 1077.0 x 274.0 x 351.0mm (42-3/8 x 10-3/4 x 13-13/16inch) whereas B&W 603 has external dimensions of 985.0 x 190.0 x 340.0mm (38.7 x 7.4 x 13.3inch).
KEF R5 is clearly the larger of the two speakers. Its body is 84mm wider, 92mm taller and 11mm deeper than B&W 603.
Below you can see the front view size comparison of KEF R5 and B&W 603 in scale.
Comparison image of KEF R5 and B&W 603 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 KEF R5 is approximately 961.7cm2 / 149.1inch2 and base area of the B&W 603 is approximately 646.0cm2 / 100.1inch2. The R5 requires 49% more surface area than the BW 603 which gives it a small disadvantage on placement in tight spaces.
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 KEF R5 weighs 27.30kg / 60.1lbs and the B&W 603 weighs 24.14kg / 53.1lbs. This makes the R5 13% heavier than the BW 603.
Here is a comparison of how R5 and BW 603's weights compare with the average, max and min weights in Passive Floor-standing class.
Weight
All Floor-standing Speakers
What's in the Box of KEF R5?
Here are the items that are included inside the box of R5:
- Floorstanding loudspeaker
- Grille
- 2 Foam port plugs
- 4 Outrigger feet
- 4 Spikes
- 4 Protective discs
- 4 Screws
- 4 Washers
- Wrench
- Hex-key
- User Manual
- Warranty Information
What's in the Box of B&W 603?
Here are the items that come with the BW 603:
- Floorstanding loudspeaker
- Grille
- Plinith (base)
- 2 Jumper-straps (pre-installed)
- 4 Rubber feet
- 4 Spike feet
- 4 Hex-nuts
- 4 Screws
- 4 Washers
- 4 Lock-washers
- Two-piece foam port plug
- Hex-key
- Manual
- Bowers & Wilkins brochure
- Warranty Information
 Sensitivity |
89 dB
vs
87 dB
|
Play louder with same amount of amplification power |
 Woofer Size |
6.5 inches
vs
5.25 inches
|
Larger woofer |
|
Low Frequency Response |
48 Hz
vs
58 Hz
|
Generates deeper bass |
 Height |
985mm
vs
1077mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
646cm2
vs
961cm2
|
Takes less floor space |
| General |
KEF R5 |
Bowers & Wilkins 603 |
| Brand |
KEF |
Bowers Wilkins |
| Speaker Type |
Floor-standing speaker |
Floor-standing speaker |
| Power Range |
15-200 watts |
30-200 watts |
| Sensitivity |
87 dB |
88.5 dB |
| Impedance |
8 ohms |
8 ohms |
| Impedance |
3.2 ohms |
n/a |
| Frequency Response |
58-28k Hz |
48-28k Hz |
Drivers |
|
|
| Woofer Quantity |
2 |
2 |
| Woofer Size |
5.25" |
6.5" |
| Woofer Composition |
Hybrid Aluminum |
Paper |
| Woofer Surround Material |
Rubber |
Rubber |
| Tweeter Size |
1" |
1" |
| Tweeter Type |
Dome |
n/a |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
5" |
6" |
| Crossover Frequency |
400Hz and 2900Hz |
n/a |
| Firing Direction |
rear |
rear |
Physical Specs |
|
|
| Height |
1077.0mm (42.4") |
985.0mm (38.8") |
| Width |
274.0mm (10.8") |
190.0mm (7.5") |
| Depth |
351.0mm (13.8") |
340.0mm (13.4") |
| Weight |
27.30kg (60.1lbs) |
24.14kg (53.1lbs) |
| Enclosure |
Bass Reflex |
Bass Reflex |
| Finish |
MDF/Lacquer |
MDF/Vinyl |
| Available Colors |
Black Gloss, White Gloss, Walnut |
Black, White, Oak |
| Grille |
Yes |
Yes |
| Moisture Resistancy |
No |
No |
Connections |
|
|
| Biamp Inputs |
Yes |
Yes |
Other |
|
|
| Parts Warranty |
5 Years |
5 Years |
| Labor Warranty |
5 Years |
5 Years |
No single best speaker here - they are built to different priorities, and the right one depends on your room, your amplifier and what you listen to.
| Area | Better | Why |
|---|
| Bass |
B |
B&W 603 digs deeper - 48Hz against 58Hz. |
| Amplifier needs |
B |
B&W 603 is more sensitive (89dB vs 87dB), so it goes louder on the same amplifier. |
| Headroom |
evenly matched |
Similar power handling (200W vs 200W). |
| Size |
depends |
B&W 603 is easier to place; KEF R5 is bigger, which usually goes with fuller bass. Your room decides. |
| Expandability |
depends |
KEF R5: bi-amping; B&W 603: bi-amping. |
A KEF R5
B B&W 603
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?
B&W 603 has the edge on paper, though the margin is not large. The rows marked "depends" may matter more to you than the score does. If a subwoofer is in your plans, the bass gap largely stops mattering - you would be crossing over above 58Hz anyway, so judge these on the other rows instead. In a large or open-plan room, KEF R5 has the cabinet volume to fill it more easily; in a small room, near a wall or at desk distance, B&W 603 is the easier speaker to get right.
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.