In this review, we will be comparing Diamond 225 and RTi A3, two Passive Bookshelf speakers from Wharfedale and Polk Audio. Let's have a brief look at the main features
of Wharfedale 225 and Polk RTi A3 first before getting into our more
detailed comparison.
What size room are the Wharfedale 225 and Polk RTi A3 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 Wharfedale 225 and Polk RTi A3 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
Both Diamond 225 and RTi A3 are 2-way speakers.
Driver |
Wharfedale 225 |
Polk RTi A3 |
Driver Setup
|
2-way
|
2-way
|
Tweeter
|
1-inch
|
1-inch
|
Midrange
|
- |
- |
Woofer
|
1 x 6.5-inch
|
1 x 6.5-inch
|
Diamond 225 features a 1" Dome Tweeter and 1 x 6.5" Woven Kevlar Woofer with a Crossover frequency at 2300Hz. On the other hand, the RTi A3 features a 1" silk polymer composite Dome Tweeter and 1 x 6.5" Polymer composite Woofer with a Crossover frequency at 2800Hz.
Frequency Response
Diamond 225 has a frequency range of 45-20k Hz whereas RTi A3 has a frequency range of 50-26k Hz. With a minimum frequency of 45Hz, the Diamond 225 can go significantly deeper on the low side and provide stronger bass compared to the RTi A3's min frequency of 50Hz.
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 Bookshelf class in our database.
Low Frequency
Bookshelf Speakers
High Frequency
Bookshelf 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
Diamond 225 and RTi A3 have the same Impedance of 8 ohms but where they differ is the sensitivity levels. Diamond 225 sensitivity is rated at 87 dB and the RTi A3's is at 89 dB. This 2 dB difference makes the Polk RTi A3 a more sensitive speaker compared to Wharfedale 225, 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. 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.
Diamond 225 can handle a max power of 150 watts RMS from the amp the whereas Diamond 225 has a max power handling value of 120 watts RMS , 30 watts less than the RTi A3.
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
Both Diamond 225 and RTi A3 features dual binding post speaker terminals for bi-amping or bi-wiring.
Cabinet Type and Port Position
Diamond 225 has a bottom firing port whereas RTi A3 has a back and front firing ports.
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 Wharfedale 225's and Polk RTi A3's external dimensions. Wharfedale 225 has external dimensions of 355.0 x 196.0 x 290.0mm ( 13.9 x 7.7 x 11.4inch) whereas Polk RTi A3 has external dimensions of 374.7 x 214.4 x 355.6mm ( 14.7 x 8.4 x 14.0inch) .
Polk RTi A3 is clearly the larger of the two speakers. Its body is 18.4mm wider, 19.7mm taller and 65.6mm deeper than Wharfedale 225.
Below you can see the front view size comparison of Wharfedale 225 and Polk RTi A3 in scale.
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 225 is approximately 568.4cm2 / 88.1inch2 and base area of the Polk RTi A3 is approximately 762.4cm2 / 118.2inch2. The Diamond 225 requires 25% less surface area than the RTi A3 which gives it a small advantage on placement in tight spaces.
Here is an another comparison that shows both speakers on a BDI Octave Media Cabinet, next to a standard size amplifier and turntable in scale:
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 225 weighs 6.55kg / 14.4lbs and the Polk RTi A3 weighs 7.26kg / 16lbs. This makes the RTi A3 11% heavier than the Diamond 225.
Here is a comparison of how Diamond 225 and RTi A3'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 225?
Here are the items that are included inside the box of Diamond 225:
2 Bookshelf loudspeakers 2 Grilles (pre-installed) 8 Self-adhesive rubber feet User's Manual Installation Guide
What's in the Box of Polk RTi A3?
Here are the items that come with the RTi A3:
2 Cherry bookshelf speakers 2 Self-tapping screws 8 Self-adhesive rubber feet Owner's Manual Template Online registration sheet Polk Audio product brochure
Low Frequency Response |
45 Hz
vs
50 Hz
|
Generates deeper bass |
Height |
355mm
vs
374mm
|
Easier to fit in smaller spaces |
Base Surface Area |
568cm2 (196x290mm)
vs
762cm2 (214x355mm)
|
Takes less floor space |
Price per pair* |
349USD
vs
465USD
|
costs less (*prices may change depending on the seller, location and time) |
Max Input Power |
150 watts
vs
120 watts
|
Handle more power from your amplifier |
Sensitivity |
89 dB
vs
87 dB
|
Play louder with same amount of amplification power |
High Frequency Response |
26k Hz
vs
20k Hz
|
Generates higher frequency |
Mounting Bracket |
Yes
vs
No
|
Allows mounting on walls |
General |
Wharfedale Diamond 225 |
Polk Audio RTi A3 |
Brand |
Wharfedale |
Polk Audio |
Speaker Type |
Bookshelf speakers |
Bookshelf speakers |
Power Range |
25-120 watts |
20-150 watts |
Sensitivity |
87 dB |
89 dB |
Impedance |
8 ohms |
8 ohms |
Impedance |
4.2 ohms |
n/a |
Frequency Response |
45-20k Hz |
50-26k Hz |
Drivers |
|
|
Woofer Quantity |
1 |
1 |
Woofer Size |
6.5" |
6.5" |
Woofer Composition |
Woven Kevlar |
Polymer composite |
Woofer Surround Material |
Rubber |
Butyl rubber |
Tweeter Size |
1" |
1" |
Tweeter Type |
Dome |
Dome |
Aimable Tweeter |
No |
No |
Midrange Driver |
No |
No |
Crossover Frequency |
2300Hz |
2800Hz |
Firing Direction |
bottom |
back and front |
Physical Specs |
|
|
Height |
355.0mm (14") |
374.7mm (14.8") |
Width |
196.0mm (7.7") |
214.4mm (8.4") |
Depth |
290.0mm (11.4") |
355.6mm (14") |
Weight |
6.55kg (14.4lbs) |
7.26kg (16lbs) |
Enclosure |
Bass Reflex |
Bass Reflex |
Finish |
MDF/Wood veneer |
Real wood veneer |
Available Colors |
Black, White, Walnut |
Black, Cherry |
Mounting Bracket |
No |
Keyhole |
Recommended Stand Height |
24" |
24-31" |
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 |