In this review, we will be comparing Studio 2 55IW and 255C-RT, two Passive In-wall speakers from JBL and Polk Audio.
Let's have a brief look at the main features
of JBL Studio 2 55IW and Polk Audio 255C-RT first before getting into our more
detailed comparison.
| Key Specs | JBL Studio 2 55IW | Polk Audio 255C-RT |
|---|
| Brand | JBL
United States · founded 1946 | Polk Audio
United States · founded 1972 |
|---|
| Design | 2-way | 2-way |
|---|
| Tweeter | 1" Hard-Dome | 1" Soft-Dome |
|---|
| Woofer | 2 x 5.25" PolyPlas | 2 x 5.25" Polymer Composite |
|---|
| Frequency response | 40-20kHz | 50-25kHz |
|---|
| Sensitivity | 88 dB | 90 dB |
|---|
| Impedance | 8 ohms | 8 ohms |
|---|
| Power range | up to 120 watts | 10-150 watts |
|---|
| Dimensions (H x W x D) | 14.1250" x 6.4375" x 3.3750"
359.0 x 164.0 x 86.0mm | 7.5625" x 13.0625" x 3-7/8"
193.0 x 332.0 x 98.4mm |
|---|
What size room are the JBL Studio 2 55IW and Polk Audio 255C-RT 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* |
JBL Studio 2 55IW |
Polk Audio 255C-RT |
| Near-field |
Poor |
Poor |
| Small Room |
Average |
Average |
| Mid-size Room |
Good |
Good |
| Large Room |
Average |
Average |
| Very Large Room |
Poor |
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 Studio 2 55IW and 255C-RT are 2-way speakers.
JBL Studio 2 55IWPolk Audio 255C-RT
TweeterWoofer
Front view, drawn to scale - cabinets and drivers share one scale, so sizes are directly comparable. Hover a driver for its size.
| Driver |
JBL Studio 2 55IW |
Polk Audio 255C-RT |
|
Driver Setup
|
2-way
|
2-way
|
|
Tweeter
|
1-inch
|
1-inch
|
|
Midrange
|
- |
- |
|
Woofer
|
2 x 5.25-inch
|
2 x 5.25-inch
|
Studio 2 55IW features a 1" Hard-Dome Tweeter and 2 x 5.25" PolyPlas Woofer. On the other hand, the 255C-RT features a 1" Soft-Dome Tweeter and 2 x 5.25" Polymer Composite Woofer.
Frequency Response
Studio 2 55IW has a frequency range of 40-20kHz whereas 255C-RT has a frequency range of 50-25kHz. With a minimum frequency of 40Hz, the Studio 2 55IW can go significantly deeper on the low side and provide stronger bass compared to the 255C-RT's min frequency of 50Hz.
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
Studio 2 55IW and 255C-RT have the same Impedance of 8 ohms but where they differ is the sensitivity levels. Studio 2 55IW sensitivity is rated at 88 dB and the 255C-RT's is at 90 dB. This 2 dB difference makes the Polk Audio 255C-RT a more sensitive speaker compared to JBL Studio 2 55IW, hence will play louder with the same amount of watts.
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.
255C-RT can handle a max power of 150 watts RMS, whereas Studio 2 55IW has a max power handling value of 120 watts RMS, 30 watts less than the 255C-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
Studio 2 55IW features Spring post type posts and 255C-RT has a Spring post 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 JBL Studio 2 55IW's and Polk Audio 255C-RT's external dimensions. JBL Studio 2 55IW has external dimensions of 359.0 x 164.0 x 86.0mm (14.1250-inch x 6.4375-inch x 3.3750-inch) whereas Polk Audio 255C-RT has external dimensions of 193.0 x 332.0 x 98.4mm (7.5625-inch x 13.0625-inch x 0.0000-inch).
JBL Studio 2 55IW is 168mm narrower and 12.4mm less deeper than Polk Audio 255C-RT but it is also 166mm taller.
What's in the Box of JBL Studio 2 55IW?
Here are the items that are included inside the box of Studio 2 55IW:
- In-wall loudspeaker
- Grille
- Cloth scrim
- Cut-Out Template
- Instruction Manual
What's in the Box of Polk Audio 255C-RT?
Here are the items that come with the 255C-RT:
- In-wall center-channel loudspeaker
- White metal grille
- Mounting template
- Owners Manual
- Sheer-Grille Painting instructions
- Online Registration Card
- Polk Audio product brochure