In this review, we will be comparing Airmotiv B1+ and Q150, two Passive Bookshelf speakers from Emotiva and KEF. Let's have a brief look at the main features
of Emotiva Airmotiv B1+ and KEF Q150 first before getting into our more
detailed comparison.
What size room are the Emotiva Airmotiv B1+ 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:
In the following sections, we will get into more detail in order to better understand how the Emotiva Airmotiv B1+ and KEF Q150 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
Both Airmotiv B1+ and Q150 are 2-way speakers.
| Driver |
Emotiva Airmotiv B1+ |
KEF Q150 |
|
Driver Setup
|
2-way
|
2-way
|
|
Tweeter
|
25×32 mm-inch
|
1-inch
|
|
Midrange
|
- |
- |
|
Woofer
|
1 x 5.25-inch
|
1 x 5.25-inch
|
Airmotiv B1+ features a 25×32 mm" folded ribbon Tweeter and 1 x 5.25" woven fiber cone Woofer with a Crossover frequency at 2000Hz. 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
Airmotiv B1+ has a frequency range of 48 Hz – 28 kHz whereas Q150 has a frequency range of 51-28k Hz. With a minimum frequency of 48Hz, the Airmotiv B1+ can go slightly deeper then the Q150's min frequency of 51Hz.
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 Bookshelf class in our database.
Low Frequency
Bookshelf Speakers
High Frequency
Bookshelf 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
Airmotiv B1+ and Q150 have the same Impedance of 8 ohms and their sensitivity is also same at 86 dB.
Sensitivity
Bookshelf 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.
Airmotiv B1+ can handle a max power of 100 watts RMS from the amp the whereas Airmotiv B1+ has a max power handling value of 70 watts RMS , 30 watts less than the Q150.
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.
Cabinet Type and Port Position
Both Airmotiv B1+ and Q150 have rear firing ports. Rear ported speakers generally need more room between the backside of the speaker and the wall compared to sealed and front/bottom ported speakers. Placing the speakers too close to the walls may cause the bass to sound boomy.
If you are limited in space and can't get the speakers away from the backwall, check our Speakers with Front Firing Ports page.
Emotiva Airmotiv B1+ Port
KEF Q150 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 Emotiva Airmotiv B1+'s and KEF Q150's external dimensions. Emotiva Airmotiv B1+ has external dimensions of 274.0 x 181.0 x 210.0mm ( 10-3/4 x 7-1/8 x 8-1/4inch) whereas KEF Q150 has external dimensions of 303.0 x 180.0 x 278.0mm ( 11.9 x 7.0 x 10.9inch) .
Emotiva Airmotiv B1+ is 29mm shorter and 68mm less deeper than KEF Q150 but it is also 1mm wider.
Below you can see the front view size comparison of Emotiva Airmotiv B1+ and KEF Q150 in scale.
Comparison image of Emotiva Airmotiv B1+ 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 Emotiva Airmotiv B1+ is approximately 380.1cm2 / 58.9inch2 and base area of the KEF Q150 is approximately 500.4cm2 / 77.6inch2. The Airmotiv B1+ requires 24% less surface area than the Q150 which gives it a small advantage on placement in tight spaces.
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:
Size Comparison image of Emotiva Airmotiv B1+ and KEF Q150 on a Media Console
Weight Comparison The weight of a loudspeaker can become an important factor if you need to move and reposition the unit often. Weight of a speaker can also "sometimes" be an indicator of the rigidity of the enclosure and the quality of the internal components used. The Emotiva Airmotiv B1+ weighs 4.00kg / 8.8lbs and the KEF Q150 weighs 5.60kg / 12.3lbs. This makes the Q150 40% heavier than the Airmotiv B1+.
Here is a comparison of how Airmotiv B1+ and Q150's weights compare with the average, max and min weights in Passive Bookshelf class.
Weight
All Bookshelf Speakers
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
 Low Frequency Response |
48 Hz
vs
51 Hz
|
Generates deeper bass |
 Height |
274mm
vs
303mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
380cm2 (181x210mm)
vs
500cm2 (180x278mm)
|
Takes less floor space |
 Price per pair* |
299USD
vs
600USD
|
costs less (*prices may change depending on the seller, location and time) |
 Max Input Power |
100 watts
vs
70 watts
|
Handle more power from your amplifier |
| General |
Emotiva Airmotiv B1+ |
KEF Q150 |
| Brand |
Emotiva |
KEF |
| Speaker Type |
Bookshelf speakers |
Bookshelf speakers |
| Power Range |
Up to 70 watts |
10-100 watts |
| Sensitivity |
86 dB |
86 dB |
| Impedance |
8 ohms |
8 ohms |
| Impedance |
n/a |
3.7 ohms |
| Frequency Response |
48 Hz – 28 kHz |
51-28k Hz |
Drivers |
|
|
| Woofer Quantity |
1 |
1 |
| Woofer Size |
5.25" |
5.25" |
| Woofer Composition |
woven fiber cone |
Aluminum |
| Woofer Surround Material |
SBR |
Rubber |
| Tweeter Size |
25×32 mm" |
1" |
| Tweeter Type |
folded ribbon |
Dome |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
No |
| Crossover Frequency |
2000Hz |
2500Hz |
| Firing Direction |
rear |
rear |
Physical Specs |
|
|
| Height |
274.0mm (10.8") |
303.0mm (11.9") |
| Width |
181.0mm (7.1") |
180.0mm (7.1") |
| Depth |
210.0mm (8.3") |
278.0mm (10.9") |
| Weight |
4.00kg (8.8lbs) |
5.60kg (12.3lbs) |
| Enclosure |
Bass reflex |
Bass Reflex |
| Finish |
HDF |
MDF/Vinyl-wrapped |
| Available Colors |
Black |
Black, Walnut, White |
| Mounting Bracket |
|
No |
| Recommended Stand Height |
n/a |
18-24" |
| Grille |
Yes |
Yes |
| Moisture Resistancy |
No |
No |
Connections |
|
|
| Biamp Inputs |
n/a |
No |
Other |
|
|
| Parts Warranty |
5 Years |
5 Years |
| Labor Warranty |
5 Years |
5 Years |