In this review, we will be comparing two different type of speakers by KEF. KEF Q750 is a Floor-standing speaker whereas the Q650c is a Center Channel speaker.
Let's have a brief look at the main features of KEF Q750 and KEF Q650c first before getting into our more detailed comparison.
In the following sections, we will get into details in order to better understand how KEF Q750 and KEF Q650c 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 Q750 and Q650c are 2-way speakers. Q750 features a 1" vented aluminum Dome Tweeter and 2 x 6.5" Aluminum Woofer with a Crossover frequency at 2500Hz. On the other hand, Q650c features a 1" vented aluminum Dome Tweeter and 2 x 6.5" aluminum Woofer with a Crossover frequency at 2500Hz.
Q750 has a frequency range of 48-28k Hz whereas Q650c has a frequency range of 64-28k Hz. With a minimum frequency of 48Hz, the Q750 can go significantly deeper on the low side and provide stronger bass compared to the Q650c's min frequency of 64Hz.
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 Floor-standing class in our database.
Impedance and Sensitivity
Q750 and Q650c has the same Impedance of 8 ohms but where they differ is the sensitivity levels. Q750 sensitivity is rated at 88 dB and Q650c's is at 87 dB. This 1 dB difference makes KEF Q750 a more sensitive speaker compared to KEF Q650c, hence will play louder with the same amount of watts.
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.
Q750 and Q650c has the same power range of 15-150 watts.
Keep in mind that higher max power handling value doesn't necesssarily make that a louder speaker compared to a lower max handling speaker. Loudness or the sound level is also impacted by parameters such as Impededance, sensitivity and system efficiencies.
Input Type and Bi-Amping / Bi-Wiring
Q750 features Binding post type posts and Q650c has a Binding post type posts. None of these speakers feature bi-amping/bi-wiring.
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 KEF Q750's and KEF Q650c's external dimensions. 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) whereas KEF Q650c has external dimensions of 212.0 x 631.0 x 304.0mm ( 8-5/16 x 24-13/16 x 11-15/16inch) .
KEF Q650c is 733mm shorter and 11mm less deeper than KEF Q750 but it is also 303mm 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 KEF Q750 is approximately 1033.2cm2 / 160.1inch2 and base area of the KEF Q650c is approximately 1918.2cm2 / 297.3inch2. The Q750 requires 46% less surface area than the Q650c which gives it a small advantage on placement in tight spaces.