In this review, we will be comparing RP-500M II and Q150, two Passive Bookshelf speakers from Klipsch and KEF.
Let's have a brief look at the main features
of Klipsch RP-500M II and KEF Q150 first before getting into our more
detailed comparison.
| Key Specs | Klipsch RP-500M II | KEF Q150 |
|---|
| Brand | Klipsch
United States · founded 1946 | KEF
United Kingdom · founded 1961 |
|---|
| Design | 2-way | 2-way |
|---|
| Uni-Q driver | — | 11th Generation Uni-Q |
|---|
| Tweeter | 1" Hybrid Tractrix Horn | 1" Dome |
|---|
| Woofer | 5.25" Cerametallic cone | 5.25" Aluminum |
|---|
| Frequency response | 50-25k Hz | 51-28k Hz |
|---|
| Sensitivity | 92 dB | 86 dB |
|---|
| Impedance | 8 ohms | 8 ohms |
|---|
| Power range | up to 75 watts | 10-100 watts |
|---|
| Weight | 6.00kg / 13.2lbs | 5.60kg / 12.3lbs |
|---|
| Dimensions (H x W x D) | 13-9/16" x 6-7/8" x 10-5/8"
345.0 x 175.0 x 270.0mm | 11.9" x 7.0" x 10.9"
303.0 x 180.0 x 278.0mm |
|---|
What size room are the Klipsch RP-500M II 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* |
Klipsch RP-500M II |
KEF Q150 |
| Near-field |
Good |
Average |
| Small Room |
Good |
Good |
| Mid-size Room |
Average |
Average |
| Large Room |
Poor |
Poor |
| Very Large Room |
No way |
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 RP-500M II and Q150 are 2-way speakers.
Klipsch RP-500M IIKEF 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 |
Klipsch RP-500M II |
KEF Q150 |
|
Driver Setup
|
2-way
|
2-way
|
|
Tweeter
|
1-inch
|
1-inch
|
|
Midrange
|
- |
- |
|
Woofer
|
1 x 5.25-inch
|
1 x 5.25-inch
|
RP-500M II features a 1" titanium Hybrid Tractrix Horn Tweeter and 1 x 5.25" Cerametallic cone Woofer with a Crossover frequency at 1530 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.
Frequency Response
RP-500M II has a frequency range of 50-25k Hz whereas Q150 has a frequency range of 51-28k Hz. With a minimum frequency of 50Hz, the RP-500M II 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 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
RP-500M II and Q150 have the same Impedance of 8 ohms but where they differ is the sensitivity levels. RP-500M II sensitivity is rated at 92 dB and the Q150's is at 86 dB. This 6 dB difference makes the Klipsch RP-500M II 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.
Q150 can handle a max power of 100 watts RMS, whereas RP-500M II has a max power handling value of 75 watts RMS, 25 watts less than the Q150.
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
RP-500M II features Post type posts and Q150 has a Post type posts. None of these speakers feature bi-amping/bi-wiring.
Klipsch RP-500M II's Binding post terminals
KEF Q150's Post terminals
Cabinet Type and Port Position
Both RP-500M II 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
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 Klipsch RP-500M II's and KEF Q150's external dimensions. Klipsch RP-500M II has external dimensions of 345.0 x 175.0 x 270.0mm (13-9/16 x 6-7/8 x 10-5/8inch) whereas KEF Q150 has external dimensions of 303.0 x 180.0 x 278.0mm (11.9 x 7.0 x 10.9inch).
Klipsch RP-500M II is 5mm narrower and 8mm less deeper than KEF Q150 but it is also 42mm taller.
Below you can see the front view size comparison of Klipsch RP-500M II and KEF Q150 in scale.
Comparison image of Klipsch RP-500M II 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 Klipsch RP-500M II is approximately 472.5cm2 / 73.2inch2 and base area of the KEF Q150 is approximately 500.4cm2 / 77.6inch2. The RP-500M II requires 6% less surface area than the Q150 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 Klipsch RP-500M II 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 Klipsch RP-500M II weighs 6.00kg / 13.2lbs and the KEF Q150 weighs 5.60kg / 12.3lbs. This makes the RP-500M II 7% heavier than the Q150.
Here is a comparison of how RP-500M II 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 Klipsch RP-500M II?
Here are the items that are included inside the box of RP-500M II:
- 2 Bookshelf loudspeakers
- 2 Grilles
- User Manual
- Important Safety Instructions
- 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
 Sensitivity |
92 dB
vs
86 dB
|
Play louder with same amount of amplification power |
 Low Frequency Response |
50 Hz
vs
51 Hz
|
Generates deeper bass |
 Base Surface Area |
472cm2
vs
500cm2
|
Takes less floor space |
 Price per pair* |
599USD
vs
600USD
|
costs less (*prices may change depending on the seller, location and time) |
 Max Input Power |
100 watts
vs
75 watts
|
Handle more power from your amplifier |
 High Frequency Response |
28k Hz
vs
25k Hz
|
Generates higher frequency |
 Height |
303mm
vs
345mm
|
Easier to fit in smaller spaces |
| General |
Klipsch Reference Premiere RP-500M II |
KEF Q150 |
| Brand |
Klipsch |
KEF |
| Speaker Type |
Bookshelf speakers |
Bookshelf speakers |
| Power Range |
up to 75 watts |
10-100 watts |
| Sensitivity |
92 dB |
86 dB |
| Impedance |
8 ohms |
8 ohms |
| Impedance |
n/a |
3.7 ohms |
| Frequency Response |
50-25k Hz |
51-28k Hz |
Drivers |
|
|
| Woofer Quantity |
1 |
1 |
| Woofer Size |
5.25" |
5.25" |
| Woofer Composition |
Cerametallic cone |
Aluminum |
| Woofer Surround Material |
Rubber |
Rubber |
| Tweeter Size |
1" |
1" |
| Tweeter Type |
Hybrid Tractrix Horn |
Dome |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
No |
| Crossover Frequency |
1530 Hz |
2500Hz |
| Firing Direction |
rear |
rear |
Physical Specs |
|
|
| Height |
345.0mm (13.6") |
303.0mm (11.9") |
| Width |
175.0mm (6.9") |
180.0mm (7.1") |
| Depth |
270.0mm (10.6") |
278.0mm (10.9") |
| Weight |
6.00kg (13.2lbs) |
5.60kg (12.3lbs) |
| Enclosure |
Bass Reflex |
Bass Reflex |
| Finish |
MDF/Wood-grain vinyl |
MDF/Vinyl-wrapped |
| Available Colors |
Walnut, Black |
Black, Walnut, White |
| Mounting Bracket |
|
No |
| Recommended Stand Height |
24-28" |
18-24" |
| Grille |
Yes |
Yes |
| Moisture Resistancy |
No |
No |
Connections |
|
|
| Biamp Inputs |
No |
No |
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 | evenly matched | Much the same reach (50Hz vs 51Hz). |
| Amplifier needs | A | Klipsch RP-500M II is more sensitive (92dB vs 86dB), so it goes louder on the same amplifier. |
| Headroom | B | KEF Q150 takes more power (100W vs 75W) - more in hand in a big room. |
| Size | depends | Similar cabinet size - neither is easier to fit. |
| Expandability | depends | Neither adds bi-amping, a sub output or height drivers. Klipsch RP-500M II sits in a wider range (10 models), so a matched surround system is easier later. |
| Price | evenly matched | Much the same money ($599 vs $600 a pair). |
A Klipsch RP-500M II B KEF Q150
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?
Neither runs away with it - they trade advantages. Let the "depends" rows and your own room settle it. Match it to your room: we rate Klipsch RP-500M II the better fit for near-field listening; elsewhere the two are rated the same. If your amplifier is modest, vintage or valve-based, Klipsch RP-500M II 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.