In this review, we will be comparing two different types of speakers by KEF. KEF Q750 is a Floor-standing speaker whereas the Q150 is a Bookshelf speaker.
Let's have a brief look at the main features
of KEF Q750 and KEF Q150 first before getting into our more
detailed comparison.
| Key Specs | KEF Q750 | KEF Q150 |
|---|
| Brand | KEF
United Kingdom · founded 1961 | KEF
United Kingdom · founded 1961 |
|---|
| Design | 2-way | 2-way |
|---|
| Uni-Q driver | 11th Generation Uni-Q | 11th Generation Uni-Q |
|---|
| Tweeter | 1" Dome | 1" Dome |
|---|
| Woofer | 2 x 6.5" Aluminum | 5.25" Aluminum |
|---|
| Frequency response | 48-28k Hz | 51-28k Hz |
|---|
| Sensitivity | 88 dB | 86 dB |
|---|
| Impedance | 8 ohms | 8 ohms |
|---|
| Power range | 15-150 watts | 10-100 watts |
|---|
| Weight | 16.59kg / 36.5lbs | 5.60kg / 12.3lbs |
|---|
| Dimensions (H x W x D) | 37-3/16" x 12-7/8" x 12-3/8"
945.0 x 328.0 x 315.0mm | 11.9" x 7.0" x 10.9"
303.0 x 180.0 x 278.0mm |
|---|
Q750 and Q150 are members of KEF's Q series of speakers. Below you can find the loudspeakers from this series.
What size room are the KEF Q750 and KEF Q150 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 Q750 |
KEF Q150 |
| Near-field |
Bad |
Average |
| Small Room |
Poor |
Good |
| Mid-size Room |
Good |
Average |
| Large Room |
Good |
Poor |
| Very Large Room |
Poor |
Bad |
(* 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.
Drivers
Both Q750 and Q150 are 2-way speakers.
KEF Q750KEF Q150
TweeterWoofer
Front view, drawn to scale - cabinets and drivers share one scale, so sizes are directly comparable. Hover a driver for its size.
| Driver |
KEF Q750 |
KEF Q150 |
|
Driver Setup
|
2-way
|
2-way
|
|
Tweeter
|
1-inch
|
1-inch
|
|
Midrange
|
- |
- |
|
Woofer
|
2 x 6.5-inch
|
1 x 5.25-inch
|
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, the Q150 features a 1" vented aluminum Dome Tweeter and 1 x 5.25" Aluminum Woofer with a Crossover frequency at 2500Hz.
Frequency Response
Q750 has a frequency range of 48-28k Hz whereas Q150 has a frequency range of 51-28k Hz. With a minimum frequency of 48Hz, the Q750 can go slightly deeper then the Q150's min frequency of 51Hz.
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
Q750 and Q150 have the same Impedance of 8 ohms but where they differ is the sensitivity levels. Q750 sensitivity is rated at 88 dB and the Q150's is at 86 dB. This 2 dB difference makes the KEF Q750 a more sensitive speaker compared to KEF Q150, 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.
Q750 can handle a max power of 150 watts RMS, whereas Q150 has a max power handling value of 100 watts RMS, 50 watts less than the Q750.
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
Q750 features Post type posts and Q150 has a Post type posts. None of these speakers feature bi-amping/bi-wiring.
KEF Q750's Binding post terminals
KEF Q150's Post terminals
Cabinet Type and Port Position
Q750 has a front firing port whereas Q150 has a rear firing ports. KEF Q750's front-firing port gives more flexibility in placement in regards to proximity to walls compared to KEF Q150 with its rear-firing port.
KEF Q150 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 Q750's and KEF Q150'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 Q150 has external dimensions of 303.0 x 180.0 x 278.0mm (11.9 x 7.0 x 10.9inch).
KEF Q750 is clearly the larger of the two speakers. Its body is 148mm wider, 642mm taller and 37mm deeper than KEF Q150.
Below you can see the front view size comparison of KEF Q750 and KEF Q150 in scale.
Comparison image of KEF Q750 and KEF Q150 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 Q750 is approximately 1033.2cm2 / 160.1inch2 and base area of the KEF Q150 is approximately 500.4cm2 / 77.6inch2. The Q750 requires 106% more surface area than the Q150 which gives it a small disadvantage on placement in tight spaces.
What's in the Box of KEF Q750?
Here are the items that are included inside the box of Q750:
- Floorstanding loudspeaker
- 2 Outrigger feet
- 4 Spikes
- 6 Screws
- 6 Washers
- 4 Rubber inserts
- Hex-key
- Owners Manual
- Warranty Information
What's in the Box of KEF Q150?
Here are the items that come with the Q150:
- 2 Bookshelf loudspeakers
- 2 Foam port plugs
- 8 Self-adhesive rubber feet
- Owner's Manual
- Warranty Registration Card