In this review, we will be comparing Q150 and Bronze 2, two Passive Bookshelf speakers from KEF and Monitor Audio.
Let's have a brief look at the main features
of KEF Q150 and Monitor Audio Bronze 2 first before getting into our more
detailed comparison.
| Key Specs | KEF Q150 | Monitor Audio Bronze 2 |
|---|
| Brand | KEF
United Kingdom · founded 1961 | Monitor Audio
United Kingdom · founded 1972 |
|---|
| Design | 2-way | 2-way |
|---|
| Uni-Q driver | 11th Generation Uni-Q | — |
|---|
| Tweeter | 1" Dome | 1" Dome |
|---|
| Woofer | 5.25" Aluminum | 6.5" C-CAM |
|---|
| Frequency response | 51-28k Hz | 42-30k Hz |
|---|
| Sensitivity | 86 dB | 90 dB |
|---|
| Impedance | 8 ohms | 8 ohms |
|---|
| Power range | 10-100 watts | 30-100 watts |
|---|
| Weight | 5.60kg / 12.3lbs | 5.30kg / 11.7lbs |
|---|
| Dimensions (H x W x D) | 11.9" x 7.0" x 10.9"
303.0 x 180.0 x 278.0mm | 13.7" x 7.2" x 11.0"
350.0 x 185.0 x 281.0mm |
|---|
What size room are the KEF Q150 and Monitor Audio Bronze 2 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 Q150 |
Monitor Audio Bronze 2 |
| Near-field |
Average |
Average |
| Small Room |
Good |
Good |
| Mid-size Room |
Average |
Average |
| Large Room |
Poor |
Poor |
| Very Large Room |
Bad |
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 Q150 and Bronze 2 are 2-way speakers.
KEF Q150Monitor Audio Bronze 2
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 Q150 |
Monitor Audio Bronze 2 |
|
Driver Setup
|
2-way
|
2-way
|
|
Tweeter
|
1-inch
|
1-inch
|
|
Midrange
|
- |
- |
|
Woofer
|
1 x 5.25-inch
|
1 x 6.5-inch
|
Q150 features a 1" vented aluminum Dome Tweeter and 1 x 5.25" Aluminum Woofer with a Crossover frequency at 2500Hz. On the other hand, the Bronze 2 features a 1" Dome Tweeter and 1 x 6.5" C-CAM Woofer with a Crossover frequency at 3100Hz.
Frequency Response
Q150 has a frequency range of 51-28k Hz whereas Bronze 2 has a frequency range of 42-30k Hz. With a minimum frequency of 42Hz, the Bronze 2 can go significantly deeper on the low side and provide stronger bass compared to 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 Bookshelf class in our database.
Low Frequency
Bookshelf 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
Q150 and Bronze 2 have the same Impedance of 8 ohms but where they differ is the sensitivity levels. Q150 sensitivity is rated at 86 dB and the Bronze 2's is at 90 dB. This 4 dB difference makes the Monitor Audio Bronze 2 a more sensitive speaker compared to KEF Q150, hence will play louder with the same amount of watts.
Sensitivity
Bookshelf 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.
Both handle the same maximum of 100 watts RMS, though Q150 is rated 10-100 watts and Bronze 2 30-100 watts.
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
Bronze 2 features Post posts which make bi-amping or bi-wiring possible. Q150 has a Post which doesn't feature bi-amping/bi-wiring.
KEF Q150's Post terminals
Cabinet Type and Port Position
Q150 has a rear firing port whereas Bronze 2 has a front firing ports. Monitor Audio Bronze 2'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 Q150's and Monitor Audio Bronze 2's external dimensions. KEF Q150 has external dimensions of 303.0 x 180.0 x 278.0mm (11.9 x 7.0 x 10.9inch) whereas Monitor Audio Bronze 2 has external dimensions of 350.0 x 185.0 x 281.0mm (13.7 x 7.2 x 11.0inch).
Monitor Audio Bronze 2 is clearly the larger of the two speakers. Its body is 5mm wider, 47mm taller and 3mm deeper than KEF Q150.
Below you can see the front view size comparison of KEF Q150 and Monitor Audio Bronze 2 in scale.
Comparison image of KEF Q150 and Monitor Audio Bronze 2 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 Q150 is approximately 500.4cm2 / 77.6inch2 and base area of the Monitor Audio Bronze 2 is approximately 519.9cm2 / 80.6inch2. The Q150 requires 4% less surface area than the Bronze 2 which gives it a small advantage on placement in tight spaces.
Here is 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 KEF Q150 and Monitor Audio Bronze 2 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 KEF Q150 weighs 5.60kg / 12.3lbs and the Monitor Audio Bronze 2 weighs 5.30kg / 11.7lbs. This makes the Q150 6% heavier than the Bronze 2.
Here is a comparison of how Q150 and Bronze 2'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 are included inside the box of Q150:
- 2 Bookshelf loudspeakers
- 2 Foam port plugs
- 8 Self-adhesive rubber feet
- Owner's Manual
- Warranty Registration Card
What's in the Box of Monitor Audio Bronze 2?
Here are the items that come with the Bronze 2:
- 2 Bookshelf loudspeakers
- 2 Grilles
- 2 Foam port plugs
- Hex-key
- Owner's Manual
- Important Safety Instructions
 Height |
303mm
vs
350mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
500cm2
vs
519cm2
|
Takes less floor space |
 Sensitivity |
90 dB
vs
86 dB
|
Play louder with same amount of amplification power |
 Woofer Size |
6.5 inches
vs
5.25 inches
|
Larger woofer |
|
Low Frequency Response |
42 Hz
vs
51 Hz
|
Generates deeper bass |
 High Frequency Response |
30k Hz
vs
28k Hz
|
Generates higher frequency |
 Bi-Amping and Bi-Wiring |
Yes
vs
No
|
Allows bi-amping and bi-wiring connections |
 Port Position |
Front
vs
Rear
|
Gives more flexibility placing close to walls |
 Price per pair* |
379USD
vs
600USD
|
costs less (*prices may change depending on the seller, location and time) |
| General |
KEF Q150 |
Monitor Audio Bronze 2 |
| Brand |
KEF |
Monitor Audio |
| Speaker Type |
Bookshelf speakers |
Bookshelf speakers |
| Power Range |
10-100 watts |
30-100 watts |
| Sensitivity |
86 dB |
90 dB |
| Impedance |
8 ohms |
8 ohms |
| Impedance |
3.7 ohms |
n/a |
| Frequency Response |
51-28k Hz |
42-30k Hz |
Drivers |
|
|
| Woofer Quantity |
1 |
1 |
| Woofer Size |
5.25" |
6.5" |
| Woofer Composition |
Aluminum |
C-CAM |
| Woofer Surround Material |
Rubber |
Rubber |
| Tweeter Size |
1" |
1" |
| Tweeter Type |
Dome |
Dome |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
No |
| Crossover Frequency |
2500Hz |
3100Hz |
| Firing Direction |
rear |
front |
Physical Specs |
|
|
| Height |
303.0mm (11.9") |
350.0mm (13.8") |
| Width |
180.0mm (7.1") |
185.0mm (7.3") |
| Depth |
278.0mm (10.9") |
281.0mm (11.1") |
| Weight |
5.60kg (12.3lbs) |
5.30kg (11.7lbs) |
| Enclosure |
Bass Reflex |
Bass Reflex |
| Finish |
MDF/Vinyl-wrapped |
MDF/Wood-grain vinyl |
| Available Colors |
Black, Walnut, White |
Walnut, White, Rosemah, Black |
| Mounting Bracket |
No |
No |
| Recommended Stand Height |
18-24" |
30-31" |
| Grille |
Yes |
Yes |
| Moisture Resistancy |
No |
No |
Connections |
|
|
| Biamp Inputs |
No |
Yes |
Other |
|
|
| Parts Warranty |
5 Years |
5 Years |
| Labor Warranty |
5 Years |
5 Years |
No single best speaker here - they are built to different priorities, and the right one depends on your room, your amplifier and what you listen to.
| Area | Better | Why |
|---|
| Bass | B | Monitor Audio Bronze 2 digs deeper - 42Hz against 51Hz. A subwoofer would even that out. |
| Amplifier needs | B | Monitor Audio Bronze 2 is more sensitive (90dB vs 86dB), so it goes louder on the same amplifier. |
| Headroom | evenly matched | Similar power handling (100W vs 100W). |
| Size | depends | Similar cabinet size - neither is easier to fit. |
| Expandability | B | Monitor Audio Bronze 2: bi-amping. Monitor Audio Bronze 2 sits in a wider range (11 models), so a matched surround system is easier later. |
| Price | B | Monitor Audio Bronze 2 is cheaper - $379 against $600, about 37% less. |
A KEF Q150 B Monitor Audio Bronze 2
depends neither is better in the abstract - it turns on your room, your system or how you will use them. Only specs published for both speakers are judged; anything missing on either side is left out rather than guessed.
Which should you choose?
Monitor Audio Bronze 2 is the easier recommendation: it leads on most of the measured areas and costs less. Take KEF Q150 if its size, looks or fit in your room suit you better. If a subwoofer is in your plans, the bass gap largely stops mattering - you would be crossing over above 51Hz anyway, so judge these on the other rows instead. If your amplifier is modest, vintage or valve-based, Monitor Audio Bronze 2 is the safer partner - the other will want more current or more watts to sound its best.
And remember what a spec sheet cannot show: how each looks in your room and whether the finish suits it, what dealer support and warranty are like where you live, and how they actually sound to you. If you can hear them first - ideally with your own music - that will tell you more than any number above.