In this review, we will be comparing EVO4.1 and RTi A1, two Passive Bookshelf speakers from Wharfedale and Polk Audio.
Let's have a brief look at the main features
of Wharfedale EVO4.1 and Polk RTi A1 first before getting into our more
detailed comparison.
| Key Specs | Wharfedale EVO4.1 | Polk RTi A1 |
|---|
| Brand | Wharfedale
United Kingdom · founded 1932 | Polk Audio
United States · founded 1972 |
|---|
| Design | 2-way | 2-way |
|---|
| Tweeter | 1.18x2.36" AMT (Ribbon) | 1" Dome |
|---|
| Woofer | 5" Kevlar | 5.25" Polymer composite |
|---|
| Frequency response | 64-22k Hz | 60-26k Hz |
|---|
| Sensitivity | 87 dB | 89 dB |
|---|
| Impedance | 8 ohms | 8 ohms |
|---|
| Power range | 25-100 watts | 20-125 watts |
|---|
| Weight | 7.80kg / 17.2lbs | 5.44kg / 12lbs |
|---|
| Dimensions (H x W x D) | 13.1" x 8.2" x 11.6"
335.0 x 210.0 x 295.0mm | 12.0" x 7.3" x 11.5"
304.8 x 187.5 x 292.1mm |
|---|
What size room are the Wharfedale EVO4.1 and Polk RTi A1 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* |
Wharfedale EVO4.1 |
Polk RTi A1 |
| Near-field |
Average |
Poor |
| Small Room |
Good |
Average |
| Mid-size Room |
Average |
Good |
| Large Room |
Poor |
Average |
| Very Large Room |
Bad |
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 EVO4.1 and RTi A1 are 2-way speakers.
Wharfedale EVO4.1Polk RTi A1
TweeterWoofer
Front view, drawn to scale - cabinets and drivers share one scale, so sizes are directly comparable. Hover a driver for its size.
| Driver |
Wharfedale EVO4.1 |
Polk RTi A1 |
|
Driver Setup
|
2-way
|
2-way
|
|
Tweeter
|
1.18x2.36-inch
|
1-inch
|
|
Midrange
|
- |
- |
|
Woofer
|
1 x 5-inch
|
1 x 5.25-inch
|
EVO4.1 features a 1.18x2.36" AMT (Ribbon) Tweeter and 1 x 5" Kevlar Woofer. On the other hand, the RTi A1 features a 1" silk polymer composite Dome Tweeter and 1 x 5.25" Polymer composite Woofer with a Crossover frequency at 1900Hz.
Frequency Response
EVO4.1 has a frequency range of 64-22k Hz whereas RTi A1 has a frequency range of 60-26k Hz. With a minimum frequency of 60Hz, the RTi A1 can go slightly deeper then the EVO4.1's min frequency of 64Hz.
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
EVO4.1 and RTi A1 have the same Impedance of 8 ohms but where they differ is the sensitivity levels. EVO4.1 sensitivity is rated at 87 dB and the RTi A1's is at 89 dB. This 2 dB difference makes the Polk RTi A1 a more sensitive speaker compared to Wharfedale EVO4.1, 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.
RTi A1 can handle a max power of 125 watts RMS, whereas EVO4.1 has a max power handling value of 100 watts RMS, 25 watts less than the RTi A1.
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
Both EVO4.1 and RTi A1 features dual binding post speaker terminals for bi-amping or bi-wiring.
Wharfedale EVO4.1's Binding post terminals allows Bi-amping or bi-wiring
Cabinet Type and Port Position
EVO4.1 has a bottom firing port whereas RTi A1 has a back and front firing ports.
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 Wharfedale EVO4.1's and Polk RTi A1's external dimensions. Wharfedale EVO4.1 has external dimensions of 335.0 x 210.0 x 295.0mm (13.1 x 8.2 x 11.6inch) whereas Polk RTi A1 has external dimensions of 304.8 x 187.5 x 292.1mm (12.0 x 7.3 x 11.5inch).
Wharfedale EVO4.1 is clearly the larger of the two speakers. Its body is 22.5mm wider, 30.2mm taller and 2.9mm deeper than Polk RTi A1.
Below you can see the front view size comparison of Wharfedale EVO4.1 and Polk RTi A1 in scale.
Comparison image of Wharfedale EVO4.1 and Polk RTi A1 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 Wharfedale EVO4.1 is approximately 619.5cm2 / 96.0inch2 and base area of the Polk RTi A1 is approximately 547.7cm2 / 84.9inch2. The EVO4.1 requires 13% more surface area than the RTi A1 which gives it a small disadvantage 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 Wharfedale EVO4.1 and Polk RTi A1 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 Wharfedale EVO4.1 weighs 7.80kg / 17.2lbs and the Polk RTi A1 weighs 5.44kg / 12lbs. This makes the EVO4.1 43% heavier than the RTi A1.
Here is a comparison of how EVO4.1 and RTi A1's weights compare with the average, max and min weights in Passive Bookshelf class.
Weight
All Bookshelf Speakers
What's in the Box of Wharfedale EVO4.1?
Here are the items that are included inside the box of EVO4.1:
- 2 Bookshelf loudspeakers
- 2 Grilles
- 4 Jumper-bars (pre-installed)
- 8 Self-adhesive rubber feet
- Pair of white cloth gloves
- User Manual
What's in the Box of Polk RTi A1?
Here are the items that come with the RTi A1:
- 2 Cherry bookshelf speakers
- 2 Self-tapping screws
- 8 Self-adhesive rubber feet
- Owner's Manual
- Template
- Online registration sheet
- Polk Audio product brochure
 Max Input Power |
125 watts
vs
100 watts
|
Handle more power from your amplifier |
 Sensitivity |
89 dB
vs
87 dB
|
Play louder with same amount of amplification power |
 Woofer Size |
5.25 inches
vs
5 inches
|
Larger woofer |
|
Low Frequency Response |
60 Hz
vs
64 Hz
|
Generates deeper bass |
 High Frequency Response |
26k Hz
vs
22k Hz
|
Generates higher frequency |
 Mounting Bracket |
Yes
vs
No
|
Allows mounting on walls |
 Height |
304mm
vs
335mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
547cm2
vs
619cm2
|
Takes less floor space |
 Price per pair* |
382USD
vs
799USD
|
costs less (*prices may change depending on the seller, location and time) |
| General |
Wharfedale EVO4.1 |
Polk Audio RTi A1 |
| Brand |
Wharfedale |
Polk Audio |
| Speaker Type |
Bookshelf speakers |
Bookshelf speakers |
| Power Range |
25-100 watts |
20-125 watts |
| Sensitivity |
87 dB |
89 dB |
| Impedance |
8 ohms |
8 ohms |
| Impedance |
3.5 ohms |
n/a |
| Frequency Response |
64-22k Hz |
60-26k Hz |
Drivers |
|
|
| Woofer Quantity |
1 |
1 |
| Woofer Size |
5" |
5.25" |
| Woofer Composition |
Kevlar |
Polymer composite |
| Woofer Surround Material |
Rubber |
Butyl rubber |
| Tweeter Size |
1.18x2.36" |
1" |
| Tweeter Type |
AMT (Ribbon) |
Dome |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
No |
| Crossover Frequency |
n/a |
1900Hz |
| Firing Direction |
bottom |
back and front |
Physical Specs |
|
|
| Height |
335.0mm (13.2") |
304.8mm (12") |
| Width |
210.0mm (8.3") |
187.5mm (7.4") |
| Depth |
295.0mm (11.6") |
292.1mm (11.5") |
| Weight |
7.80kg (17.2lbs) |
5.44kg (12lbs) |
| Enclosure |
Bass Reflex |
Bass Reflex |
| Finish |
MDF/Wood-veneer |
Real wood veneer |
| Available Colors |
Walnut,Black,White |
Black, Cherry |
| Mounting Bracket |
No |
Keyhole |
| Recommended Stand Height |
24-26" |
28-36" |
| Grille |
Yes |
n/a |
| Moisture Resistancy |
No |
No |
Connections |
|
|
| Biamp Inputs |
Yes |
Yes |
Other |
|
|
| Parts Warranty |
5 Years |
5 Years |
| Labor Warranty |
5 Years |
5 Years |
These sit in different price classes - Wharfedale EVO4.1 costs roughly 2.1x what Polk RTi A1 does. Expect it to lead on paper; the question is whether the gap is audible enough in your room to be worth it.
| Area | Better | Why |
|---|
| Bass | B | Polk RTi A1 digs deeper - 60Hz against 64Hz. A subwoofer would even that out. |
| Amplifier needs | B | Polk RTi A1 is more sensitive (89dB vs 87dB), so it goes louder on the same amplifier. |
| Headroom | B | Polk RTi A1 takes more power (125W vs 100W) - more in hand in a big room. |
| Size | depends | Similar cabinet size - neither is easier to fit. |
| Expandability | depends | Wharfedale EVO4.1: bi-amping; Polk RTi A1: bi-amping. Wharfedale EVO4.1 sits in a wider range (7 models), so a matched surround system is easier later. |
| Price | B | Polk RTi A1 is cheaper - $382 against $799, about 52% less; arguably a different class. |
A Wharfedale EVO4.1 B Polk RTi A1
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?
Polk RTi A1 is the easier recommendation: it leads on most of the measured areas and costs less. Take Wharfedale EVO4.1 if its size, looks or fit in your room suit you better. Match it to your room: we rate Wharfedale EVO4.1 the better fit for near-field listening and a small room, and Polk RTi A1 for a mid-size room and a large room. If your amplifier is modest, vintage or valve-based, Polk RTi A1 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.