In this review, we will be comparing 702 S3 and Q750, two Passive Floor-standing speakers from Bowers Wilkins and KEF.
Let's have a brief look at the main features
of B&W 702 S3 and KEF Q750 first before getting into our more
detailed comparison.
B&W 702 S3 Key Specs
- 3-way Design
- 1" Tweeter
- 6" Midrange
- 3 x 6.5" Aerofoil Woofer
- 46-28k Hz Frequency Response
- 90 dB Sensitivity
- Impedance: 8ohms
- Power Range:30-300watts
- Weight:33.46kg
- Dimensions (H x W x D): 1138.0" x 7.6" x 15.4"( 1138.0 x 192.0 x 391.0mm )
KEF Q750 Key Specs
- 2-way Design
- 11th Generation Uni-Q Driver
- 1" Dome Tweeter
- 2 x 6.5" Aluminum Woofer
- 48-28k Hz Frequency Response
- 88 dB Sensitivity
- Impedance: 8ohms
- Power Range:15-150watts
- Weight:16.59kg
- Dimensions (H x W x D): 945.0" x 12-7/8" x 12-3/8"( 945.0 x 328.0 x 315.0mm )
What size room are the B&W 702 S3 and KEF Q750 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 702 S3 |
KEF Q750 |
| Near-field |
Bad |
Bad |
| Small Room |
Poor |
Poor |
| Mid-size Room |
Average |
Good |
| Large Room |
Good |
Good |
| Very Large Room |
Average |
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.)
In the following sections, we will get into more detail in order to better understand how the B&W 702 S3 and KEF Q750 compare and hopefully end up with enough arguments to decide which one of these loudspeakers is the better choice for you.
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Drivers
One of the fundamental differences between these two speakers is that 702 S3 is a 3-way design whereas the Q750 is a 2-way speaker. 3-way designs utilize a midrange driver in addition to the tweeter and woofer on 2-way designs. Designing a crossover for a 3-way speaker is a complicated process and generally increases the overall cost of the speaker.
| Driver |
B&W 702 S3 |
KEF Q750 |
|
Driver Setup
|
3-way
|
2-way
|
|
Tweeter
|
1-inch
|
1-inch
|
|
Midrange
|
1 x 6-inch |
- |
|
Woofer
|
3 x 6.5-inch
|
2 x 6.5-inch
|
702 S3 features a 1" Tweeter , a 6" Midrange and 3 x 6.5" Aerofoil Woofer . On the other hand, the Q750 features a 1" vented aluminum Dome Tweeter and 2 x 6.5" Aluminum Woofer with a Crossover frequency at 2500Hz.
Frequency Response
702 S3 has a frequency range of 46-28k Hz whereas Q750 has a frequency range of 48-28k Hz. With a minimum frequency of 46Hz, the 702 S3 can go slightly deeper then the Q750's min frequency of 48Hz.
Below graphs depict how these two speakers compare with the max, min and average values of the Min and Max Frequencies of other speakers in the Floor-standing class in our database.
Low Frequency
Floor-standing Speakers
High Frequency
Floor-standing Speakers
None of these speakers achieves full range experience which is commonly agreed as 20Hz-20kHz. In order to achieve lower lows / deeper bass, we recommend you pair these with a subwoofer. Visit our Powered Subwoofers section to find out more about the available options.
Impedance and Sensitivity
702 S3 and Q750 have the same Impedance of 8 ohms but where they differ is the sensitivity levels. 702 S3 sensitivity is rated at 90 dB and the Q750's is at 88 dB.
Sensitivity
Floor-standing Speakers
Power Range
Power
range is the range of input power in watts RMS that a loudspeaker is designed to handle. While using
an amplifier within this range ensures the nominal performance , inputting a power that is higher than the
max wattage can result in a damaged speaker.
702 S3 can handle a max power of 300 watts RMS from the amp the whereas Q750 has a max power handling value of 150 watts RMS, 150 watts less than the 702 S3.
Keep in mind that a higher max power handling value doesn't necessarily make that a louder speaker
compared to a lower max handling speaker. Loudness or the sound level is also impacted by parameters
such as Impedance, sensitivity and system efficiencies.
Input Type and Bi-Amping / Bi-Wiring
702 S3 features Binding post posts which make bi-amping or bi-wiring possible. Q750 has a Binding post which doesn't feature bi-amping/bi-wiring.
B&W 702 S3's Binding post terminals allows Bi-amping or bi-wiring
KEF Q750's Binding post terminals
Cabinet Type and Port Position
702 S3 has a rear firing port whereas Q750 has a front firing ports. KEF Q750's front-firing port gives more flexibility in placement in regards to proximity to walls compared to B&W 702 S3 with its rear-firing port.
Physical Specs
Size of a speaker can sometimes become 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 702 S3's and KEF Q750's external dimensions. B&W 702 S3 has external dimensions of 1138.0 x 192.0 x 391.0mm ( 44.8-inch x 7.6-inch x 15.4-inch) whereas KEF Q750 has external dimensions of 945.0 x 328.0 x 315.0mm ( 37-3/16 x 12-7/8 x 12-3/8inch) .
KEF Q750 is 193mm shorter and 76mm less deeper than B&W 702 S3 but it is also 136mm wider.
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 702 S3 is approximately 750.7cm2 / 116.4inch2 and base area of the KEF Q750 is approximately 1033.2cm2 / 160.1inch2. The 702 S3 requires 27% less surface area than the Q750 which gives it a small advantage on placement in tight spaces.