In this review, we will be comparing BW 706 S2 and Q150, two Passive Bookshelf speakers from Bowers & Wilkins and KEF. Let's have a brief look at the main features of B&W 706 S2 and KEF Q150 first before getting into our more detailed comparison.
In the following sections, we will get into details in order to better understand how B&W 706 S2 and KEF Q150 compares and hopefully end up with enough arguments to decide which one of these loudspeakers is the better choice for you.
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Both BW 706 S2 and Q150 are 2-way speakers. BW 706 S2 features a 1" Decoupled Carbon Decoupled Soft-Dome Tweeter and 1 x 6.5" Continuum Woofer . On the other hand, Q150 features a 1" vented aluminum Dome Tweeter and 1 x 5.25" Aluminum Woofer with a Crossover frequency at 2500Hz.
BW 706 S2 has a frequency range of 50-28k Hz whereas Q150 has a frequency range of 51-28k Hz. With a minimum frequency of 51Hz, the Q150 can go slightly deeper then the BW 706 S2's min frequency of 50Hz.
Below graphs depict how these two speakers compare with the max, min and average values of the Min and Max Frequencies of other speakers under Bookshelf class in our database.
Impedance and Sensitivity
BW 706 S2 and Q150 has the same Impedance of 8 ohms but where they differ is the sensitivity levels. BW 706 S2 sensitivity is rated at 88 dB and Q150's is at 86 dB. This 2 dB difference makes B&W 706 S2 a more sensitive speaker compared to KEF Q150, hence will play louder with the same amount of watts.
BW 706 S2 has a power range of 30-120 watts RMS whereas Q150 has a power range of 10-100 watts.
Input Type and Bi-Amping / Bi-Wiring
BW 706 S2 features Post posts which makes bi-amping or bi-wiring possible. Q150 has a Post which doesn't feature bi-amping/bi-wiring.
Cabinet Type and Port Position
Both BW 706 S2 and Q150 have rear firing ports. Rear ported speakers generlly need more room between the backside of the speaker and the wall compared to sealed and front/bottom ported speakers. Placing too close to the walls may cause the bass to sound boomy.
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 706 S2's and KEF Q150's external dimensions. B&W 706 S2 has external dimensions of 341.3 x 201.0 x 302.0mm ( 13-7/16 x 7-7/8 x 11-7/8inch) whereas KEF Q150 has external dimensions of 303.0 x 180.0 x 278.0mm ( 11.9 x 7.0 x 10.9inch) .
B&W 706 S2 is clearly the larger of the two speakers. Its body is 21mm wider, 38.3mm taller and 24mm deeper than KEF Q150.
Below you can see the front view size comparison of B&W 706 S2 and KEF Q150 in scale.
Here is an another comparison that shows both speakers on a BDI Octave Media Cabinet, next to a standard size amplifier and turntable in scale: