In this review, we will be comparing Airmotiv C2+ and ES35, two Passive Center Channel speakers from Emotiva and Polk Audio. Let's have a brief look at the main features
of Emotiva Airmotiv C2+ and Polk ES35 first before getting into our more
detailed comparison.
What size room are the Emotiva Airmotiv C2+ and Polk ES35 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 Emotiva Airmotiv C2+ and Polk ES35 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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Drivers
One of the fundamental differences between these two speakers is that Airmotiv C2+ is a 3-way design whereas the ES35 is a 2-way speaker. 3-way designs utilize a midrange driver in addition to the tweeter and woofer on 2-way designs. Designing a crossover for a 3-way speaker is a complicated process and generally increases the overall cost of the speaker.
| Driver |
Emotiva Airmotiv C2+ |
Polk ES35 |
|
Driver Setup
|
3-way
|
2-way
|
|
Tweeter
|
25×32 mm-inch
|
1-inch
|
|
Midrange
|
2 x 3-inch |
- |
|
Woofer
|
2 x 6.5-inch
|
6 x 3-inch
|
Airmotiv C2+ features a 25×32 mm" folded ribbon Tweeter , a 3" Midrange and 2 x 6.5" woven fiber cone Woofer with a Crossover frequency at 350 Hz and 3200Hz. On the other hand, the ES35 features a 1" Terylene High-res dome Tweeter and 6 x 3" mica-reinforced polypropylene Dynamic Balance Woofer .
Frequency Response
Airmotiv C2+ has a frequency range of 45 Hz – 28 kHz whereas ES35 has a frequency range of 66-40k Hz. With a minimum frequency of 45Hz, the Airmotiv C2+ can go significantly deeper on the low side and provide stronger bass compared to the ES35's min frequency of 66Hz.
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 Center Channel class in our database.
Low Frequency
Center Channel Speakers
High Frequency
Center Channel 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
Airmotiv C2+ is a 4 ohms speaker compared to the ES35 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 Airmotiv C2+ can provide this impedance level.
These two speakers also have different sensitivity levels. Airmotiv C2+ sensitivity is rated at 92 dB and the ES35's is rated at 89 dB. This 3 dB difference makes the Emotiva Airmotiv C2+ a more sensitive speaker compared to Polk ES35, 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. 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.
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
Airmotiv C2+ features Binding post posts which make bi-amping or bi-wiring possible. ES35 has a 5-Way post which doesn't feature bi-amping/bi-wiring.
Emotiva Airmotiv C2+'s Binding post terminals allows Bi-amping or bi-wiring
Polk ES35's 5-Way post terminals
Cabinet Type and Port Position
Both Airmotiv C2+ and ES35 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.
Emotiva Airmotiv C2+ Port
Polk ES35 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 Emotiva Airmotiv C2+'s and Polk ES35's external dimensions. Emotiva Airmotiv C2+ has external dimensions of 220.0 x 812.0 x 267.0mm ( 8-5/8 x 31-15/16 x 10-1/2inch) whereas Polk ES35 has external dimensions of 107.0 x 621.0 x 154.0mm ( 4-3/16 x 24-7/16 x 6-1/16inch) .
Emotiva Airmotiv C2+ is clearly the larger of the two speakers. Its body is 191mm wider, 113mm taller and 113mm deeper than Polk ES35.
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 Emotiva Airmotiv C2+ is approximately 2168.0cm2 / 336.0inch2 and base area of the Polk ES35 is approximately 956.3cm2 / 148.2inch2. The Airmotiv C2+ requires 127% more surface area than the ES35 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 Emotiva Airmotiv C2+ weighs 16.40kg / 36.1lbs and the Polk ES35 weighs 6.36kg / 14lbs. This makes the Airmotiv C2+ 158% heavier than the ES35.
Here is a comparison of how Airmotiv C2+ and ES35'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 Polk ES35?
Here are the items that come with the ES35:
LCR loudspeakerGrille (attached)4 Self-adhesive rubber feetWall-mount templateOwners ManualOnline Product Registration
 Driver Setup |
3-way
vs
2-way
|
Have a dedicated mid-range driver |
 Sensitivity |
92 dB
vs
89 dB
|
Play louder with same amount of amplification power |
 Woofer Size |
6.5 inches
vs
3 inches
|
Larger woofer |
| Low Frequency Response |
45 Hz
vs
66 Hz
|
Generates deeper bass |
 Nominal Impedance |
8 ohms
vs
4 ohms
|
Less selective with amplifiers |
| Number of Woofers |
6
vs
2
|
More woofers |
 High Frequency Response |
40k Hz
vs
28k Hz
|
Generates higher frequency |
 Height |
107mm
vs
220mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
956cm2 (621x154mm)
vs
2168cm2 (812x267mm)
|
Takes less floor space |
 Price per pair* |
399USD
vs
499USD
|
costs less (*prices may change depending on the seller, location and time) |
| General |
Emotiva Airmotiv C2+ |
Polk Audio Signature Elite ES35 |
| Brand |
Emotiva |
Polk Audio |
| Speaker Type |
Center channel speaker |
Low-profile center channel speaker |
| Power Range |
Up to 150 watts |
20-150 watts |
| Sensitivity |
92 dB |
89 dB |
| Impedance |
4 ohms |
8 ohms |
| Frequency Response |
45 Hz – 28 kHz |
66-40k Hz |
Drivers |
|
|
| Woofer Quantity |
2 |
6 |
| Woofer Size |
6.5" |
3" |
| Woofer Composition |
woven fiber cone |
mica-reinforced polypropylene Dynamic Balance |
| Tweeter Size |
25×32 mm" |
1" |
| Tweeter Type |
folded ribbon |
High-res dome |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
3" |
N/A" |
| Crossover Frequency |
350 Hz and 3200Hz |
n/a |
| Firing Direction |
rear |
rear |
Physical Specs |
|
|
| Height |
220.0mm (8.7") |
107.0mm (4.2") |
| Width |
812.0mm (32") |
621.0mm (24.4") |
| Depth |
267.0mm (10.5") |
154.0mm (6.1") |
| Weight |
16.40kg (36.1lbs) |
6.36kg (14lbs) |
| Enclosure |
Bass reflex |
Bass Reflex |
| Finish |
HDF |
MDF, Wood-grain vinyl |
| Available Colors |
Black |
Black, Walnut, White |
| Grille |
Yes |
Yes |
| Moisture Resistancy |
No |
No |
Connections |
|
|
| Biamp Inputs |
Yes |
n/a |
Other |
|
|
| Parts Warranty |
5 Years |
5 Years |
| Labor Warranty |
5 Years |
5 Years |