In this review, we will be comparing 65 RT and RC85i, two Passive In-wall speakers by Polk Audio.
Let's have a brief look at the main features
of Polk Audio 65 RT and Polk Audio RC85i first before getting into our more
detailed comparison.
| Key Specs | Polk Audio 65 RT | Polk Audio RC85i |
|---|
| Brand | Polk Audio
United States · founded 1972 | Polk Audio
United States · founded 1972 |
|---|
| Design | 2-way | 2-way |
|---|
| Tweeter | 1" Soft-Dome | 1" Hard-Dome |
|---|
| Woofer | 6.5" Polymer Composite | 8" Polypropylene |
|---|
| Frequency response | 50-25kHz | 50-20kHz |
|---|
| Sensitivity | 90 dB | 90 dB |
|---|
| Impedance | 8 ohms | 8 ohms |
|---|
| Power range | 10-125 watts | 20-100 watts |
|---|
| Dimensions (H x W x D) | 12.7500" x 7.2500" x 3-1/2"
324.0 x 185.0 x 88.9mm | 12.7500" x 8.6875" x 3.5000"
324.0 x 221.0 x 89.0mm |
|---|
What size room are the Polk Audio 65 RT and Polk Audio RC85i 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* |
Polk Audio 65 RT |
Polk Audio RC85i |
| Near-field |
Poor |
Average |
| Small Room |
Average |
Good |
| Mid-size Room |
Good |
Average |
| Large Room |
Average |
Poor |
| Very Large Room |
Poor |
Bad |
(* 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.
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Drivers
Both 65 RT and RC85i are 2-way speakers.
Polk Audio 65 RTPolk Audio RC85i
TweeterWoofer
Front view, drawn to scale - cabinets and drivers share one scale, so sizes are directly comparable. Hover a driver for its size.
| Driver |
Polk Audio 65 RT |
Polk Audio RC85i |
|
Driver Setup
|
2-way
|
2-way
|
|
Tweeter
|
1-inch
|
1-inch
|
|
Midrange
|
- |
- |
|
Woofer
|
1 x 6.5-inch
|
1 x 8-inch
|
65 RT features a 1" Soft-Dome Tweeter and 1 x 6.5" Polymer Composite Woofer. On the other hand, the RC85i features a 1" Hard-Dome Tweeter and 1 x 8" Polypropylene Woofer.
Frequency Response
65 RT has a frequency range of 50-25kHz whereas RC85i has a frequency range of 50-20kHz.
The graph below depicts how these two speakers compare with the max, min and average Low Frequency values of other speakers in the In-wall class in our database.
Low Frequency
In-wall 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
65 RT and RC85i have the same Impedance of 8 ohms and their sensitivity is also same at 90 dB.
Sensitivity
In-wall 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.
65 RT can handle a max power of 125 watts RMS, whereas RC85i has a max power handling value of 100 watts RMS, 25 watts less than the 65 RT.
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
65 RT features Spring clip type posts and RC85i has a Spring clip type posts. None of these speakers feature bi-amping/bi-wiring.
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 Polk Audio 65 RT's and Polk Audio RC85i's external dimensions. Polk Audio 65 RT has external dimensions of 324.0 x 185.0 x 88.9mm (12.7500-inch x 7.2500-inch x 0.0000-inch) whereas Polk Audio RC85i has external dimensions of 324.0 x 221.0 x 89.0mm (12.7500-inch x 8.6875-inch x 3.5000-inch).
Polk Audio 65 RT is 36mm narrower and 0.099999999999994mm less deeper than Polk Audio 65 RT but they have the same height of 324.0mm.
What's in the Box of Polk Audio 65 RT?
Here are the items that are included inside the box of 65 RT:
- Rectangular in-wall speaker
- Foam rubber port plug
- White metal grille
- Mounting template
- Owners Manual
- Sheer-Grille Painting instructions
- Online Registration Card
- Polk Audio product brochure
What's in the Box of Polk Audio RC85i?
Here are the items that come with the RC85i:
- 2 White in-wall speakers
- 2 White grilles
- 1 Cardboard Mounting Template
- Owners Manual
- Online registration sheet
- Product Registration Card