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JBL Studio 630 vs KEF Q350 Comparison

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JBL Studio 630

Passive Bookshelf | 45-40k Hz

JBL Studio 630
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KEF Q350

Passive Bookshelf | 63-28k Hz

KEF Q350
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JBL Studio 630 JBL Studio 630
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KEF Q350 KEF Q350
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JBL Studio 630
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KEF Q350
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JBL Studio 630 vs KEF Q350 Speaker Comparison

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.

JBL Studio 630 Key Specs

  • 2-way Design
  • 1" High Frequency Compression Tweeter
  • 6.25" PolyPlas Woofer
  • 45-40k Hz Frequency Response
  • 85 dB Sensitivity
  • Impedance: 6ohms
  • Power Range:up to 150watts
  • Weight:9.02kg
  • Dimensions (H x W x D): 372.0" x 9-1/16" x 11-1/16"( 230 x 280 x 372mm )

KEF Q350 Key Specs

  • 2-way Design
  • 11th Generation Uni-Q Driver
  • 1" Dome Tweeter
  • 6.5" Aluminum Woofer
  • 63-28k Hz Frequency Response
  • 87 dB Sensitivity
  • Impedance: 8ohms
  • Power Range:10-120watts
  • Weight:7.60kg
  • Dimensions (H x W x D): 358.0" x 8.2" x 12.0"( 358.0 x 210.0 x 306.0mm )

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:

Listening Environment* JBL Studio 630 KEF Q350
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.)

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.


**This post contains affiliate links, and I will be compensated if you make a purchase after clicking through my links. As an Amazon Associate I earn from qualifying purchases.


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

Studio 630
Q350
Min
Average
Max
High Frequency

Bookshelf Speakers

JBL Studio 630
KEF Q350
Min
Average
Max

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

Studio 630
Q350
Min
Average
Max

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 Q350Post Terminals
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
JBL Studio 630
KEF Q350
Min
Average
Max

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

  • Reasons to choose JBL Studio 630 over KEF Q350
    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

    Reasons to choose KEF Q350 over JBL Studio 630

    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 vs 644cm2 Takes less floor space
    JBL Studio 630 vs KEF Q350 Specs Table
    Detailed comparison of specifications
    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

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