In this review, we will be comparing Theva No1 and Q150, two Passive Bookshelf speakers from Focal and KEF. Let's have a brief look at the main features
of Focal Theva No1 and KEF Q150 first before getting into our more
What size room are the Focal Theva No1 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 Focal Theva No1 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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Both Theva No1 and Q150 are 2-way speakers.
|Focal Theva No1
1 x 6.5-inch
1 x 5.25-inch
Theva No1 features a 1" TNF Al/Mg inverted dome Tweeter and 1 x 6.5" Slatefiber Woofer with a Crossover frequency at 3000 Hz. 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.
Theva No1 has a frequency range of 58-28kHz whereas Q150 has a frequency range of 51-28k Hz. With a minimum frequency of 51Hz, the Q150 can go significantly deeper on the low side and provide stronger bass compared to the Theva No1'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 in the Bookshelf class in our database.
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
Theva No1 and Q150 have the same Impedance of 8 ohms but where they differ is the sensitivity levels. Theva No1 sensitivity is rated at 89 dB and the Q150's is at 86 dB. This 3 dB difference makes the Focal Theva No1 a more sensitive speaker compared to KEF Q150, 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.
Theva No1 can handle a max power of 120 watts RMS from the amp the whereas Q150 has a max power handling value of 100 watts RMS, 20 watts less than the Theva No1.
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.
Input Type and Bi-Amping / Bi-Wiring
Theva No1 features Binding post posts which make bi-amping or bi-wiring possible. Q150 has a Post which doesn't feature bi-amping/bi-wiring.
Cabinet Type and Port Position
Both Theva No1 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.
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 Focal Theva No1's and KEF Q150's external dimensions. Focal Theva No1 has external dimensions of 391.0 x 213.0 x 261.0mm ( 153/8 x 83/8 x 101/4) whereas KEF Q150 has external dimensions of 303.0 x 180.0 x 278.0mm ( 11.9 x 7.0 x 10.9inch) .
KEF Q150 is 33mm narrower and 88mm shorter than Focal Theva No1 but it is also 17mm deeper.
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 Focal Theva No1 is approximately 555.9cm2 / 86.2inch2 and base area of the KEF Q150 is approximately 500.4cm2 / 77.6inch2. The Theva No1 requires 11% more surface area than the Q150 which gives it a small disadvantage on placement in tight spaces.
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 Focal Theva No1 weighs 6.82kg / 15lbs and the KEF Q150 weighs 5.60kg / 12.3lbs. This makes the Theva No1 22% heavier than the Q150.
Here is a comparison of how Theva No1 and Q150's weights compare with the average, max and min weights in Passive Bookshelf class.
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
| Max Input Power
| Handle more power from your amplifier
| Play louder with same amount of amplification power
| Minimum Impedance
| Very low impedance levels puts more pressure on amplifier
| Woofer Size
| Larger woofer
| Bi-Amping and Bi-Wiring
| Allows bi-amping and bi-wiring connections
| Low Frequency Response
| Generates deeper bass
| Easier to fit in smaller spaces
| Base Surface Area
| Takes less floor space
| Price per pair*
| costs less (*prices may change depending on the seller, location and time)
|Focal Theva No1
|Woofer Surround Material
|Black High Gloss,Dark Wood,Light Wood
|Black, Walnut, White
|Recommended Stand Height