In this review, we will be comparing S50 and RTi A5, two Passive Floor-standing speakers by Polk Audio Let's have a brief look at the main features
of Polk S50 and Polk RTi A5 first before getting into our more
detailed comparison.
What size room are the Polk S50 and Polk RTi A5 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 Polk S50 and Polk RTi A5 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 S50 and RTi A5 are 2-way speakers.
| Driver |
Polk S50 |
Polk RTi A5 |
|
Driver Setup
|
2-way
|
2-way
|
|
Tweeter
|
1-inch
|
1-inch
|
|
Midrange
|
- |
- |
|
Woofer
|
2 x 5.25-inch
|
2 x 6.5-inch
|
S50 features a 1" Terylene Dome Tweeter and 2 x 5.25" Mica-reinforced polypropylene Woofer with a Crossover frequency at 2500Hz. On the other hand, the RTi A5 features a 1" Tweeter and 2 x 6.5" Polymer composite Woofer .
Frequency Response
S50 has a frequency range of 33-40k Hz whereas RTi A5 has a frequency range of 40-26k Hz. With a minimum frequency of 33Hz, the S50 can go significantly deeper on the low side and provide stronger bass compared to the RTi A5's min frequency of 40Hz.
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 Floor-standing class in our database.
Low Frequency
Floor-standing Speakers
High Frequency
Floor-standing 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
S50 and RTi A5 have the same Impedance of 8 ohms but where they differ is the sensitivity levels. S50 sensitivity is rated at 89 dB and the RTi A5's is at 90 dB. This 1 dB difference makes the Polk RTi A5 a more sensitive speaker compared to Polk S50, hence will play louder with the same amount of watts.
Sensitivity
Floor-standing 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.
S50 can handle a max power of 250 watts RMS from the amp the whereas S50 has a max power handling value of 150 watts RMS , 100 watts less than the RTi A5.
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 S50 and RTi A5 features dual binding post speaker terminals for bi-amping or bi-wiring.
Polk S50's 5-way post terminals allows Bi-amping or bi-wiring
Cabinet Type and Port Position
S50 has a bottom firing port whereas RTi A5 has a front firing ports. Polk RTi A5's front-firing port gives more flexibility in placement in regards to proximity to walls compared to Polk S50 with its rear-firing port.
Polk S50 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 Polk S50's and Polk RTi A5's external dimensions. Polk S50 has external dimensions of 951.0 x 262.0 x 281.0mm ( 37-7/16 x 10-5/16 x 11-1/16inch) whereas Polk RTi A5 has external dimensions of 1007.0 x 269.0 x 404.0mm ( 39-5/8 x 10-9/16 x 15-7/8inch) .
Polk RTi A5 is clearly the larger of the two speakers. Its body is 7mm wider, 56mm taller and 123mm deeper than Polk S50.
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 Polk S50 is approximately 736.2cm2 / 114.1inch2 and base area of the Polk RTi A5 is approximately 1086.8cm2 / 168.5inch2. The S50 requires 32% less surface area than the RTi A5 which gives it a small advantage 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 Polk S50 weighs 14.50kg / 31.9lbs and the Polk RTi A5 weighs 18.18kg / 40lbs. This makes the RTi A5 25% heavier than the S50.
Here is a comparison of how S50 and RTi A5's weights compare with the average, max and min weights in Passive Floor-standing class.
Weight
All Floor-standing Speakers
What's in the Box of Polk S50?
Here are the items that are included inside the box of S50:
Floorstanding loudspeakerGrille (attached)4 Feet (pre-installed)Owners ManualOnline Product Registration
What's in the Box of Polk RTi A5?
Here are the items that come with the RTi A5:
Cherry floor-standing speakerDetachable black cloth grille4 Screw-on spike feetOwners ManualOnline registration sheetPolk Audio product brochure
 Low Frequency Response |
33 Hz
vs
40 Hz
|
Generates deeper bass |
 High Frequency Response |
40k Hz
vs
26k Hz
|
Generates higher frequency |
 Height |
951mm
vs
1007mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
736cm2 (262x281mm)
vs
1086cm2 (269x404mm)
|
Takes less floor space |
 Max Input Power |
250 watts
vs
150 watts
|
Handle more power from your amplifier |
 Sensitivity |
90 dB
vs
89 dB
|
Play louder with same amount of amplification power |
| Woofer Size |
6.5 inches
vs
5.25 inches
|
Larger woofer |
| General |
Polk Audio Signature S50 |
Polk Audio RTi A5 |
| Brand |
Polk Audio |
Polk Audio |
| Speaker Type |
Floor-standing speaker |
Floor-standing speaker |
| Power Range |
20-150 watts |
20-250 watts |
| Sensitivity |
89 dB |
90 dB |
| Impedance |
8 ohms |
8 ohms |
| Frequency Response |
33-40k Hz |
40-26k Hz |
Drivers |
|
|
| Woofer Quantity |
2 |
2 |
| Woofer Size |
5.25" |
6.5" |
| Woofer Composition |
Mica-reinforced polypropylene |
Polymer composite |
| Woofer Surround Material |
Butyl rubber |
Butyl Rubber |
| Tweeter Size |
1" |
1" |
| Tweeter Type |
Dome |
n/a |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
No |
| Crossover Frequency |
2500Hz |
n/a |
| Firing Direction |
bottom |
front |
Physical Specs |
|
|
| Height |
951.0mm (37.4") |
1007.0mm (39.6") |
| Width |
262.0mm (10.3") |
269.0mm (10.6") |
| Depth |
281.0mm (11.1") |
404.0mm (15.9") |
| Weight |
14.50kg (31.9lbs) |
18.18kg (40lbs) |
| Enclosure |
Bass Reflex |
Bass Reflex |
| Finish |
Meddite MDF |
Real wood veneer |
| Available Colors |
Black |
Cherry |
| Grille |
Yes |
Yes |
| Moisture Resistancy |
No |
No |
Connections |
|
|
| Biamp Inputs |
Yes |
Yes |
Other |
|
|
| Parts Warranty |
5 Years |
5 Years |
| Labor Warranty |
5 Years |
5 Years |