In this review, we will be comparing Studio 630 and Q350, two Passive Bookshelf speakers from JBL and KEF. Let's have a brief look at the main features
of JBL Studio 630 and KEF Q350 first before getting into our more
detailed comparison.
What size room are the JBL Studio 630 and KEF Q350 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 JBL Studio 630 and KEF Q350 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 630 and Q350 are 2-way speakers.
| Driver |
JBL Studio 630 |
KEF Q350 |
|
Driver Setup
|
2-way
|
2-way
|
|
Tweeter
|
1-inch
|
1-inch
|
|
Midrange
|
- |
- |
|
Woofer
|
1 x 6.25-inch
|
1 x 6.5-inch
|
Studio 630 features a 1" High Frequency Compression Tweeter and 1 x 6.25" PolyPlas Woofer . On the other hand, the Q350 features a 1" vented aluminum Dome Tweeter and 1 x 6.5" Aluminum Woofer with a Crossover frequency at 2500Hz.
Frequency Response
Studio 630 has a frequency range of 45-40k Hz whereas Q350 has a frequency range of 63-28k Hz. With a minimum frequency of 45Hz, the Studio 630 can go significantly deeper on the low side and provide stronger bass compared to the Q350's min frequency of 63Hz.
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 630 is a 6 ohms speaker compared to the Q350 which has a nominal impedance of 8 ohms.
These two speakers also have different sensitivity levels. Studio 630 sensitivity is rated at 85 dB and the Q350's is rated at 87 dB. This 2 dB difference makes the KEF Q350 a more sensitive speaker compared to JBL Studio 630, 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 630 can handle a max power of 150 watts RMS from the amp the whereas Q350 has a max power handling value of 120 watts RMS, 30 watts less than the Studio 630.
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 630 features Post type posts and Q350 has a Post type posts. None of these speakers feature bi-amping/bi-wiring.
KEF Q350's Post terminals
Cabinet Type and Port Position
Both Studio 630 and Q350 have rear firing ports. Rear ported speakers generally need more room between the backside of the speaker and the wall compared to sealed and front/bottom ported speakers. Placing the speakers too close to the walls may cause the bass to sound boomy.
If you are limited in space and can't get the speakers away from the backwall, check our Speakers with Front Firing Ports page.
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 630's and KEF Q350's external dimensions. JBL Studio 630 has external dimensions of 230 x 280 x 372mm ( 14.6 x 9-1/16inch x 11-1/16inch ) whereas KEF Q350 has external dimensions of 358.0 x 210.0 x 306.0mm ( 14.0 x 8.2 x 12.0inch) .
KEF Q350 is 20mm narrower and 14mm shorter than JBL Studio 630 but it is also 26mm deeper.
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 JBL Studio 630 is approximately 644.0cm2 / 99.8inch2 and base area of the KEF Q350 is approximately 642.6cm2 / 99.6inch2. The Studio 630 requires 0% more surface area than the Q350 which gives it a small disadvantage 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 JBL Studio 630 weighs 9.02kg / 19.8lbs and the KEF Q350 weighs 7.60kg / 16.7lbs. This makes the Studio 630 19% heavier than the Q350.
Here is a comparison of how Studio 630 and Q350's weights compare with the average, max and min weights in Passive Bookshelf class.
Weight
All Bookshelf Speakers
What's in the Box of JBL Studio 630?
Here are the items that are included inside the box of Studio 630:
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 KEF Q350?
Here are the items that come with the Q350:
2 Bookshelf loudspeakers 2 Foam port plugs 8 Self-adhesive rubber feet Owner's Manual Warranty Registration Card
 Max Input Power |
150 watts
vs
120 watts
|
Handle more power from your amplifier |
 Low Frequency Response |
45 Hz
vs
63 Hz
|
Generates deeper bass |
 High Frequency Response |
40k Hz
vs
28k Hz
|
Generates higher frequency |
 Sensitivity |
87 dB
vs
85 dB
|
Play louder with same amount of amplification power |
 Nominal Impedance |
8 ohms
vs
6 ohms
|
Less selective with amplifiers |
| Woofer Size |
6.5 inches
vs
6.25 inches
|
Larger woofer |
 Height |
358mm
vs
372mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
642cm2 (210x306mm)
vs
644cm2 (230x280mm)
|
Takes less floor space |
| General |
JBL Studio 630 |
KEF Q350 |
| Brand |
JBL |
KEF |
| Speaker Type |
Bookshelf speakers |
Bookshelf speakers |
| Power Range |
up to 150 watts |
10-120 watts |
| Sensitivity |
85 dB |
87 dB |
| Impedance |
6 ohms |
8 ohms |
| Impedance |
n/a |
3.7 ohms |
| Frequency Response |
45-40k Hz |
63-28k Hz |
Drivers |
|
|
| Woofer Quantity |
1 |
1 |
| Woofer Size |
6.25" |
6.5" |
| Woofer Composition |
PolyPlas |
Aluminum |
| Woofer Surround Material |
n/a |
Rubber |
| Tweeter Size |
1" |
1" |
| Tweeter Type |
High Frequency Compression |
Dome |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
No |
| Crossover Frequency |
n/a |
2500Hz |
| Firing Direction |
rear |
rear |
Physical Specs |
|
|
| Height |
372.0mm (14.6") |
358.0mm (14.1") |
| Width |
230.0mm (9.1") |
210.0mm (8.3") |
| Depth |
280.0mm (11") |
306.0mm (12") |
| Weight |
9.02kg (19.8lbs) |
7.60kg (16.7lbs) |
| Enclosure |
Bass Reflex |
Bass Reflex |
| Finish |
MDF/Wood veneer |
MDF/Vinyl-wrapped |
| Available Colors |
Wood, Dark Wood |
Black, Walnut, White |
| Mounting Bracket |
No |
No |
| Recommended Stand Height |
n/a |
18-24" |
| Grille |
Yes |
Yes |
| Moisture Resistancy |
No |
No |
Connections |
|
|
| Biamp Inputs |
No |
No |
Other |
|
|
| Parts Warranty |
5 Years |
5 Years |
| Labor Warranty |
5 Years |
5 Years |