In this review, we will be comparing RP-504C II and Concerta2 C25, two Passive Center Channel speakers from Klipsch and Revel.
Let's have a brief look at the main features
of Klipsch RP-504C II and Revel Concerta2 C25 first before getting into our more
detailed comparison.
| Key Specs | Klipsch RP-504C II | Revel Concerta2 C25 |
|---|
| Brand | Klipsch
United States · founded 1946 | Revel
United States · founded 1996 |
|---|
| Design | 2-way | 2-way |
|---|
| Tweeter | 1" Tractrix Horn | 1" dome with proprietary acoustic lens and waveguide |
|---|
| Woofer | 4 x 5.25" Cerametallic cone | 2 x 5.25" anodized aluminum cone |
|---|
| Frequency response | 50-25k Hz | 80Hz- 20kHz |
|---|
| Sensitivity | 96 dB | 89 dB |
|---|
| Impedance | 8 ohms | 6 ohms |
|---|
| Power range | up to 150 watts | 40-120 watts |
|---|
| Weight | 16.50kg / 36.3lbs | 9.09kg / 20lbs |
|---|
| Dimensions (H x W x D) | 6-15/16" x 32-3/16" x 15-1/8"
177.0 x 818.0 x 385.0mm | 7-3/8" x 19-1/2" x 10-3/16"
188.0 x 496.0 x 259.0mm |
|---|
What size room are the Klipsch RP-504C II and Revel Concerta2 C25 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-504C II |
Revel Concerta2 C25 |
| Near-field |
Poor |
Poor |
| Small Room |
Average |
Average |
| Mid-size Room |
Good |
Good |
| Large Room |
Average |
Average |
| Very Large Room |
Poor |
Poor |
(* 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-504C II and Concerta2 C25 are 2-way speakers.
Klipsch RP-504C IIRevel Concerta2 C25
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-504C II |
Revel Concerta2 C25 |
|
Driver Setup
|
2-way
|
2-way
|
|
Tweeter
|
1-inch
|
1-inch
|
|
Midrange
|
- |
- |
|
Woofer
|
4 x 5.25-inch
|
2 x 5.25-inch
|
RP-504C II features a 1" titanium Tractrix Horn Tweeter and 4 x 5.25" Cerametallic cone Woofer with a Crossover frequency at 1950 Hz. On the other hand, the Concerta2 C25 features a 1" aluminum dome with proprietary acoustic lens and waveguide Tweeter and 2 x 5.25" anodized aluminum cone Woofer.
Frequency Response
RP-504C II has a frequency range of 50-25k Hz whereas Concerta2 C25 has a frequency range of 80Hz- 20kHz. With a minimum frequency of 50Hz, the RP-504C II can go significantly deeper on the low side and provide stronger bass compared to the Concerta2 C25's min frequency of 80Hz.
The graph below depicts how these two speakers compare with the max, min and average Low Frequency values of other speakers in the Center Channel class in our database.
Low Frequency
Center Channel 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-504C II is a 8 ohms speaker compared to the Concerta2 C25 which has a nominal impedance of 6 ohms.
These two speakers also have different sensitivity levels. RP-504C II sensitivity is rated at 96 dB and the Concerta2 C25's is rated at 89 dB. This 7 dB difference makes the Klipsch RP-504C II a more sensitive speaker compared to Revel Concerta2 C25, hence will play louder with the same amount of watts.
Sensitivity
Center Channel 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.
RP-504C II can handle a max power of 150 watts RMS, whereas Concerta2 C25 has a max power handling value of 120 watts RMS, 30 watts less than the RP-504C II.
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-504C II features 5-Way post type posts and Concerta2 C25 has a 5-Way post type posts. None of these speakers feature bi-amping/bi-wiring.
Klipsch RP-504C II's Binding post terminals
Revel Concerta2 C25's 5-Way post terminals
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-504C II's and Revel Concerta2 C25's external dimensions. Klipsch RP-504C II has external dimensions of 177.0 x 818.0 x 385.0mm (6-15/16 x 32-3/16 x 15-1/8inch) whereas Revel Concerta2 C25 has external dimensions of 188.0 x 496.0 x 259.0mm (7-3/8 x 19-1/2 x 10-3/16inch).
Revel Concerta2 C25 is 322mm narrower and 126mm less deeper than Klipsch RP-504C II but it is also 11mm taller.
Size, drawn to scale
Both speakers and both views share one scale, so everything here is directly comparable. Hover a box for its dimensions.
One scale for both, standing on the same surface and pushed back to the same wall, so the deeper one visibly sticks out further.
Klipsch RP-504C II needs about 145% more floor or shelf area. Klipsch RP-504C II is 126mm deeper, so it stands that much further out from the wall.
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-504C II is approximately 3149.3cm2 / 488.1inch2 and base area of the Revel Concerta2 C25 is approximately 1284.6cm2 / 199.1inch2. The RP-504C II requires 145% more surface area than the Concerta2 C25 which gives it a small disadvantage on placement in tight spaces.
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-504C II weighs 16.50kg / 36.3lbs and the Revel Concerta2 C25 weighs 9.09kg / 20lbs. This makes the RP-504C II 82% heavier than the Concerta2 C25.
Here is a comparison of how RP-504C II and Concerta2 C25's weights compare with the average, max and min weights in Passive Center Channel class.
Weight
All Center Channel Speakers
What's in the Box of Klipsch RP-504C II?
Here are the items that are included inside the box of RP-504C II:
- Center channel loudspeaker
- Grille
- User Manual
- Important Safety Instructions
- Warranty Information
What's in the Box of Revel Concerta2 C25?
Here are the items that come with the Concerta2 C25:
- Center-channel loudspeaker
- Grille
- 2 Short feet
- 2 Long feet
- Owners Manual
 Max Input Power |
150 watts
vs
120 watts
|
Handle more power from your amplifier |
 Sensitivity |
96 dB
vs
89 dB
|
Play louder with same amount of amplification power |
 Nominal Impedance |
8 ohms
vs
6 ohms
|
Less selective with amplifiers |
 Number of Woofers |
4
vs
2
|
More woofers |
|
Low Frequency Response |
50 Hz
vs
80 Hz
|
Generates deeper bass |
 High Frequency Response |
25k Hz
vs
20k Hz
|
Generates higher frequency |
 Height |
177mm
vs
188mm
|
Easier to fit in smaller spaces |
 Price per pair* |
799USD
vs
825USD
|
costs less (*prices may change depending on the seller, location and time) |
 Base Surface Area |
1284cm2
vs
3149cm2
|
Takes less floor space |
| General |
Klipsch Reference Premiere RP-504C II |
Revel Concerta2 C25 |
| Brand |
Klipsch |
Revel |
| Speaker Type |
Center channel speaker |
Center channel speaker |
| Power Range |
up to 150 watts |
40-120 watts |
| Sensitivity |
96 dB |
89 dB |
| Impedance |
8 ohms |
6 ohms |
| Frequency Response |
50-25k Hz |
80Hz- 20kHz |
Drivers |
|
|
| Woofer Quantity |
4 |
2 |
| Woofer Size |
5.25" |
5.25" |
| Woofer Composition |
Cerametallic cone |
anodized aluminum cone |
| Woofer Surround Material |
Rubber |
n/a |
| Tweeter Size |
1" |
1" |
| Tweeter Type |
Tractrix Horn |
dome with proprietary acoustic lens and waveguide |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
No |
| Crossover Frequency |
1950 Hz |
n/a |
| Firing Direction |
rear |
n/a |
Physical Specs |
|
|
| Height |
177.0mm (7") |
188.0mm (7.4") |
| Width |
818.0mm (32.2") |
496.0mm (19.5") |
| Depth |
385.0mm (15.2") |
259.0mm (10.2") |
| Weight |
16.50kg (36.3lbs) |
9.09kg (20lbs) |
| Enclosure |
Bass Reflex |
Passive Radiator |
| Finish |
MDF/Wood-grain vinyl |
n/a |
| Available Colors |
Walnut, Black |
Gloss Black |
| Grille |
Yes |
Yes |
| Moisture Resistancy |
No |
No |
Connections |
|
|
| Biamp Inputs |
No |
n/a |
Other |
|
|
| Parts Warranty |
5 Years |
5 Years |
| Labor Warranty |
5 Years |
5 Years |
A generation apart: Klipsch RP-504C II is the newer design, against a 2015 model. Newer is not automatically better, but the older one is more likely to be discounted or near run-out.
| Area | Better | Why |
|---|
| Bass | A | Klipsch RP-504C II digs deeper - 50Hz against 80Hz. |
| Amplifier needs | A | Klipsch RP-504C II is more sensitive (96dB vs 89dB), so it goes louder on the same amplifier. |
| Amplifier match | A | Klipsch RP-504C II is the easier load at 8 ohms. |
| Headroom | A | Klipsch RP-504C II takes more power (150W vs 120W) - more in hand in a big room. |
| Size | depends | Revel Concerta2 C25 is easier to place; Klipsch RP-504C II is bigger, which usually goes with fuller bass. Your room decides. |
| Cabinet | depends | Ported vs Passive Radiator. |
| Expandability | depends | Neither adds bi-amping, a sub output or height drivers. Klipsch RP-504C II sits in a wider range (10 models), so a matched surround system is easier later. |
| Price | evenly matched | Much the same money ($799 vs $825 a pair). |
A Klipsch RP-504C II B Revel Concerta2 C25
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?
Klipsch RP-504C II has the edge on paper, though the margin is not large. The rows marked "depends" may matter more to you than the score does. If a subwoofer is in your plans, the bass gap largely stops mattering - you would be crossing over above 80Hz anyway, so judge these on the other rows instead. In a large or open-plan room, Klipsch RP-504C II has the cabinet volume to fill it more easily; in a small room, near a wall or at desk distance, Revel Concerta2 C25 is the easier speaker to get right.
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.