In this review, we will be comparing two different type of speakers by JBL. JBL Studio 620 is a Bookshelf speaker whereas the Studio 2 55IW is a In-wall speaker.
Let's have a brief look at the main features
of JBL Studio 620 and JBL Studio 2 55IW first before getting into our more
detailed comparison.
JBL Studio 620 Key Specs
- 2-way Design
- 1" High Frequency Compression Tweeter
- 5.25" PolyPlas Woofer
- 50-40k Hz Frequency Response
- 84 dB Sensitivity
- Impedance: 6ohms
- Power Range:up to 100watts
- Weight:6.88kg
- Dimensions (H x W x D): 312.0" x 7-1/2" x 9-1/2"( 190 x 240 x 312mm )
JBL Studio 2 55IW Key Specs
- 2-way Design
- 1" Hard-Dome Tweeter
- 2 x 5.25" PolyPlas Woofer
- 40-20kHz Frequency Response
- 88 dB Sensitivity
- Impedance: 8ohms
- Power Range:up to 120watts
- Dimensions (H x W x D): 359.0" x 6.4375" x 3.3750"( 359.0 x 164.0 x 86.0mm )
Studio 620 and Studio 2 55IW are members of JBL's Studio series of speakers. Below you can find the loudspeakers from this series.
JBL Studio Series History
What size room are the JBL Studio 620 and JBL Studio 2 55IW 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 620 |
JBL Studio 2 55IW |
| 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.)
In the following sections, we will get into more detail in order to better understand how the JBL Studio 620 and JBL Studio 2 55IW 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 Studio 620 and Studio 2 55IW are 2-way speakers.
| Driver |
JBL Studio 620 |
JBL Studio 2 55IW |
|
Driver Setup
|
2-way
|
2-way
|
|
Tweeter
|
1-inch
|
1-inch
|
|
Midrange
|
- |
- |
|
Woofer
|
1 x 5.25-inch
|
2 x 5.25-inch
|
Studio 620 features a 1" High Frequency Compression Tweeter and 1 x 5.25" PolyPlas Woofer . On the other hand, the Studio 2 55IW features a 1" Hard-Dome Tweeter and 2 x 5.25" PolyPlas Woofer .
Frequency Response
Studio 620 has a frequency range of 50-40k Hz whereas Studio 2 55IW has a frequency range of 40-20kHz. 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 Studio 620'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
Studio 620 is a 6 ohms speaker compared to the Studio 2 55IW which has a nominal impedance of 8 ohms.
These two speakers also have different sensitivity levels. Studio 620 sensitivity is rated at 84 dB and the Studio 2 55IW's is rated at 88 dB. This 4 dB difference makes the JBL Studio 2 55IW a more sensitive speaker compared to JBL Studio 620, 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.
Studio 620 can handle a max power of 120 watts RMS from the amp the whereas Studio 620 has a max power handling value of 100 watts RMS , 20 watts less than the Studio 2 55IW.
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
Studio 620 features Spring posts type posts and Studio 2 55IW has a Spring posts type posts. None of these speakers feature bi-amping/bi-wiring.
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 JBL Studio 620's and JBL Studio 2 55IW's external dimensions. JBL Studio 620 has external dimensions of 190 x 240 x 312mm ( 12.3 x 7-1/2inch x 9-1/2inch ) whereas 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) .
JBL Studio 2 55IW is 26mm narrower and 154mm less deeper than JBL Studio 620 but it is also 47mm taller.
What's in the Box of JBL Studio 620?
Here are the items that are included inside the box of Studio 620:
2 x JBL Studio 630 Bookshelf Loudspeaker 1 x Owner’s Manual 1 x Warranty Card 8 x Feet Pads
What's in the Box of JBL Studio 2 55IW?
Here are the items that come with the Studio 2 55IW:
In-wall loudspeakerGrilleCloth scrimCut-Out TemplateInstruction Manual
High Frequency Response 
Height 
Max Input Power 
Sensitivity 
Nominal Impedance 
Number of Woofers 
Base Surface Area