In this review, we will be comparing YU Passive 4-inch and Q150, two Passive Bookshelf speakers from Kanto and KEF. Let's have a brief look at the main features
of Kanto YU Passive 4-inch and KEF Q150 first before getting into our more
detailed comparison.
What size room are the Kanto YU Passive 4-inch 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 Kanto YU Passive 4-inch and KEF Q150 compare and hopefully end up with enough arguments to decide which one of these loudspeakers is the better choice for you.
**This post contains affiliate links, and I will be compensated if you make a purchase after clicking
through my links. As an Amazon Associate I earn from qualifying purchases.
Drivers
Both YU Passive 4-inch and Q150 are 2-way speakers.
| Driver |
Kanto YU Passive 4-inch |
KEF Q150 |
|
Driver Setup
|
2-way
|
2-way
|
|
Tweeter
|
1-inch
|
1-inch
|
|
Midrange
|
- |
- |
|
Woofer
|
1 x 4-inch
|
1 x 5.25-inch
|
YU Passive 4-inch features a 1" Silk Soft-Dome Tweeter and 1 x 4" Kevlar Woofer . 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
YU Passive 4-inch has a frequency range of 60-20k Hz 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 YU Passive 4-inch's min frequency of 60Hz.
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
YU Passive 4-inch is a 4 ohms speaker compared to the Q150 which has a nominal impedance of 8 ohms. Lower impedance speakers, especially the ones that are rated at 4 ohms may put more pressure on the amplifier unit especially when played at high volume levels, so make sure the amp you pair with the YU Passive 4-inch can provide this impedance level.
On the other hand, they have the same sensitivity of 86 dBdB.
Sensitivity
Bookshelf Speakers
Input Type and Bi-Amping / Bi-Wiring
YU Passive 4-inch features Post type posts and Q150 has a Post type posts. None of these speakers feature bi-amping/bi-wiring.
KEF Q150's Post terminals
Cabinet Type and Port Position
Both YU Passive 4-inch 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.
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 Kanto YU Passive 4-inch's and KEF Q150's external dimensions. Kanto YU Passive 4-inch has external dimensions of 220.0 x 140.0 x 190.0mm ( 8.7 x 5.5 x 7.5inch) 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 clearly the larger of the two speakers. Its body is 40mm wider, 83mm taller and 88mm deeper than Kanto YU Passive 4-inch.
Below you can see the front view size comparison of Kanto YU Passive 4-inch and KEF Q150 in scale.
Comparison image of Kanto YU Passive 4-inch 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 Kanto YU Passive 4-inch is approximately 266.0cm2 / 41.2inch2 and base area of the KEF Q150 is approximately 500.4cm2 / 77.6inch2. The YU Passive 4-inch requires 47% 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 Kanto YU Passive 4-inch 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 Kanto YU Passive 4-inch weighs 2.50kg / 5.5lbs and the KEF Q150 weighs 5.60kg / 12.3lbs. This makes the Q150 124% heavier than the YU Passive 4-inch.
Here is a comparison of how YU Passive 4-inch 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 Kanto YU Passive 4-inch?
Here are the items that are included inside the box of YU Passive 4-inch:
8 x Rubber Feet Manual
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
 Height |
220mm
vs
303mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
266cm2 (140x190mm)
vs
500cm2 (180x278mm)
|
Takes less floor space |
 Price per pair* |
200USD
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 |
 Nominal Impedance |
8 ohms
vs
4 ohms
|
Less selective with amplifiers |
 Woofer Size |
5.25 inches
vs
4 inches
|
Larger woofer |
| Low Frequency Response |
51 Hz
vs
60 Hz
|
Generates deeper bass |
 High Frequency Response |
28k Hz
vs
20k Hz
|
Generates higher frequency |
| General |
Kanto YU Passive 4-inch |
KEF Q150 |
| Brand |
Kanto |
KEF |
| Speaker Type |
Bookshelf speakers |
Bookshelf speakers |
| Sensitivity |
86 dB |
86 dB |
| Impedance |
4 ohms |
8 ohms |
| Impedance |
n/a |
3.7 ohms |
| Frequency Response |
60-20k Hz |
51-28k Hz |
Drivers |
|
|
| Woofer Quantity |
1 |
1 |
| Woofer Size |
4" |
5.25" |
| Woofer Composition |
Kevlar |
Aluminum |
| Woofer Surround Material |
n/a |
Rubber |
| Tweeter Size |
1" |
1" |
| Tweeter Type |
Soft-Dome |
Dome |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
No |
| Crossover Frequency |
n/a |
2500Hz |
| Firing Direction |
rear |
rear |
Physical Specs |
|
|
| Height |
220.0mm (8.7") |
303.0mm (11.9") |
| Width |
140.0mm (5.5") |
180.0mm (7.1") |
| Depth |
190.0mm (7.5") |
278.0mm (10.9") |
| Weight |
2.50kg (5.5lbs) |
5.60kg (12.3lbs) |
| Enclosure |
bass reflex |
Bass Reflex |
| Finish |
n/a |
MDF/Vinyl-wrapped |
| Available Colors |
Black,White |
Black, Walnut, White |
| Mounting Bracket |
No |
No |
| Recommended Stand Height |
n/a |
18-24" |
| Grille |
n/a |
Yes |
| Moisture Resistancy |
No |
No |
Connections |
|
|
| Biamp Inputs |
n/a |
No |
Other |
|
|
| Parts Warranty |
2 years |
5 Years |
| Labor Warranty |
2 years |
5 Years |