JBL 4309 is a 2-way Passive Bass Reflex Bookshelf speaker by JBL. It was released in 2022. It features a 1" Compression Driver Tweeter and 1 x 6.5" Pure Pulp Woofer.
The smallest of the Studio Monitors: a 6.5 inch pure-pulp woofer under a 1 inch Teonex annular-ring compression driver on an HDI horn - a horn-loaded tweeter in a bookshelf cabinet, which is why it holds 100 x 80 degrees of coverage from 2 kHz up. 4 ohms and 87 dB, front-ported, with a UHF tone control on the baffle.
The speaker has a frequency range of 42-30k Hz and a sensitivity of 87 dB.
Room Size Suitability
The size of the room where you plan to use the JBL 4309 is a crucial factor in your decision. We have assessed its suitability for various room sizes based on its dimensions and maximum power output:
| Listening Environment* |
Suitability |
| Near-field | Good |
| Small Room | Good |
| Mid-size Room | Average |
| Large Room | Poor |
| Very Large Room | No way |
(* 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.)
JBL's Studio Monitor Series of Loudspeakers
4309 is a member of JBL's Studio Monitor series of Passive speakers. The Studio Monitor range are JBL's premium powered monitors, descended from the brand's professional studio speakers. Below you can see the main specs of these speakers.
See all 6 JBL Studio Monitor models compared »
JBL Studio Monitor Series Speakers
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Frequency Response of the JBL 4309 Speaker
JBL 4309 has a Frequency response range of 42-30k Hz at ±3dB and Power Range of 25-150 watts. With a minimum frequency of 42 Hz, 4309 delivers deep bass that will likely satisfy most listeners, especially those who enjoy music. However, movie enthusiasts and music fans who prefer a full range of sound may still benefit from adding a subwoofer.
Visit our Powered Subwoofers section to find out more about the available subwoofer options.
Here we have a comparison of how 4309's Low and High frequency values compare with the average, max and min Low and High frequency values in its class.
Low Frequency
Bookshelf Speakers
High Frequency
Bookshelf Speakers
Crossover frequency of the JBL 4309?
The Crossover frequency of the 4309 is set to 1.6 kHz. This is the threshold frequency where the higher frequency signals over this level are sent to the tweeter and the lower-frequency signals are sent to the woofer by the crossover component.
Impedance and Sensitivity
JBL 4309's nominal impedance level is
4 ohms and has a sensitivity of
87 dB.
Sensitivity
Bookshelf Speakers
Nominal Impedance of the 4 Ohms means that the JBL 4309 is a difficult to drive speaker from nominal Impedance perspective, make sure that you choose an amplifier than can provide 4 Ohms for this speaker.
Many AVRs (audio/video receiver) in the market may have difficulty when the speakers dip below the 4 Ohms levels (this may cause clipping or even physical damage), so we recommend to not pair the JBL 4309 with an AVR but use an Integrated Amplifier instead.
Sensitivity
With a sensitivity level of only 87 dB, JBL 4309 is a difficult to drive speaker from Sensitivity perspective, make sure to choose an amplifier with a high output if you like listening to your music at high volume levels. You may especially have a hard time using Tube amplifiers which are traditionally very low power compared to Class A/B or Class D amps.
Browse all integrated amplifiers
Input Type
4309 features Binding post type connectors. Bi-amping and Bi-wiring are not possible.
JBL 4309 External Dimensions and Weight
JBL 4309 has external dimensions of (Height x Width x Depth) 16-1/2 x 10-1/4 x 8-15/16inch (419.0 x 260.0 x 227.0mm ).
Base Surface Area
Base surface area of a loudspeaker may become a determining factor when the space in your room or desk is limited.
The base area of JBL 4309 is approximately 590.2cm2 / 91.5inch2.
WeightThe JBL 4309 weighs 10.98kg / 24.2lbs per piece. Here is a comparison of how 4309's weight compares with the average, max and min weights in its class.
Weight
All Bookshelf Speakers
Cabinet type and Materials
JBL 4309 has a
Bass Reflex type cabinet. Bass Reflex type loudspeakers (aka Ported, Vented or Reflex Port) have enclosures that uses a port, hole or vent cut into the cabinet. Ported designs are generally more efficient than the Sealed designs.
Wall Mounting
4309 doesn't sport any built-in mounting bracket, so you need an external structure to mount it on walls.
Does the JBL 4309 come with a Grille?
4309 comes with grilles. The purpose of the grille is to protect the delicate driver elements from external impacts while still allowing the sound to pass as clearly as possible.
Recommended Accessories
Here is a list of accessories that we think you may need for the JBL 4309.
- Speaker Cable and Connectors
- Vibration Isolators: IsoAcoustics isolators are our favorite isolators but you may find more affordable options too.
- Acoustic Panels and Treatments: Your room is as important as your stereo equipment so acoustic treatments goes a long way in improving the overall performance.
- Speaker Stands: Stands bring your bookshelf speakers to ideal height (rule of thumb is to have the tweeter level with your ear in your listening position), helps stability and acoustical isolation.
Official Product Page
Official manufacturer's product page for the JBL 4309 speaker can be found below:
Official Product Page for JBL 4309