In this review, we will be comparing Q750 and Q550, two Passive Floor-standing speakers by KEF. Let's have a brief look at the main features of KEF Q750 and KEF Q550 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 Q550 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 Q550 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, Q550 features a 1" vented aluminum Dome Tweeter and 2 x 5.25" Aluminum Woofer with a Crossover frequency at 2500Hz.
Q750 has a frequency range of 48-28k Hz whereas Q550 has a frequency range of 58-28k Hz. With a minimum frequency of 48Hz, the Q750 can go significantly deeper on the low side and provide stronger bass compared to the Q550's min frequency of 58Hz.
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 Q550 has the same Impedance of 8 ohms but where they differ is the sensitivity levels. Q750 sensitivity is rated at 88 dB and Q550's is at 87 dB. This 1 dB difference makes KEF Q750 a more sensitive speaker compared to KEF Q550, 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 can handle a max power of 150 watts RMS from the amp the whereas Q550 has a max power handling value of 130 watts RMS, 20 watts less than the Q750.
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 Q550 has a Binding post type posts. None of these speakers feature bi-amping/bi-wiring.
Cabinet Type and Port Position
Both Q750 and Q550 have front firing ports. front ported speakers offers more flexibility in placement in regards to proximity to walls&surfaces compared to rear ported speakers.
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 Q550'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 Q550 has external dimensions of 894.0 x 296.0 x 313.0mm ( 35-3/16 x 11-5/8 x 12-5/16inch) .
KEF Q750 is clearly the larger of the two speakers. Its body is 32mm wider, 51mm taller and 2mm deeper than KEF Q550.
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 Q550 is approximately 926.5cm2 / 143.6inch2. The Q750 requires 12% more surface area than the Q550 which gives it a small disadvantage on placement in tight spaces.