JBL 4309 Bookshelf Speakers
2 199,00 €
JBL 4309 is a pair of two-way bookshelf speakers designed for a home stereo system. A 165 mm cellulose-cone woofer is combined with a 25 mm compression driver and an HDI horn. This design provides the specified 100° horizontal dispersion from 2 to 17 kHz. Two pairs of gold-plated terminals offer separate connection paths when the supplied jumpers are removed.
JBL 4309 bookshelf speakers are a compact pair of two-way studio monitor speakers designed for a home stereo system. Each speaker combines a 165 mm woofer with a 25 mm compression driver. The nominal 4-ohm impedance and recommended amplifier power of 25-150 W RMS are important considerations when choosing your electronics.
Drivers and horn design
The 2410H-2 high-frequency driver features an annular Teonex diaphragm. It operates with a High-Definition Imaging (HDI) geometry horn. The specified dispersion is 100° horizontally and 80° vertically, measured at -6 dB from 2 to 17 kHz.
The 165 mm woofer has a cast frame, a Pure-pulp cellulose cone and a 38 mm voice coil. The crossover frequency of this two-way system is 1.6 kHz. Its frequency response extends from 42 Hz to 30 kHz at the -6 dB limits.
Connecting the amplifier
The rear panel has two pairs of gold-plated speaker cable terminals. The supplied jumpers are fitted between them. When using a single pair of speaker cables, leave these jumpers in place.
Removing the jumpers provides separate connection paths for the high- and low-frequency sections. Choose this arrangement only if it is supported by your amplifier and cable system. Switch off the amplifier before changing the position of the jumpers.
High-frequency adjustment
The high-frequency level control lets you tailor the sound to the room and the direction in which the speakers are aimed. Begin with the controls on both speakers set to the same neutral position. You can then make small adjustments while listening from your usual seat.
Placement and enclosure
The enclosure uses H-shaped bracing and a front-firing bass-reflex port. The recommended speaker stand height is 609 mm. Choose a stable stand because each speaker weighs 10.98 kg.
Dimensions with the grille fitted are 419 × 260 × 227 mm. Allow space around the enclosure, however, and determine the final distance from the wall by listening.
Place both speakers at the same height and at similar distances from the listening position. Adjust their toe-in equally. This helps maintain a symmetrical arrangement in relation to the horn’s specified dispersion pattern.
Finish options
The enclosure is available in satin walnut or black walnut veneer. The walnut version comes with a dark blue monitor-style grille, while the black walnut version has a black grille.
Both versions have a blue front baffle inspired by the classic styling of JBL studio monitors. The shape of the grille is designed to accommodate the horn area.
Technical specifications
| Model | JBL 4309 |
|---|---|
| Type | Two-way bookshelf studio monitor speaker |
| Sold as | Pair |
| Woofer | 165 mm, cast frame, Pure-pulp cellulose cone |
| Voice coil | 38 mm |
| High-frequency driver | JBL 2410H-2, 25 mm compression driver, annular Teonex diaphragm |
| Horn | HDI geometry |
| Recommended amplifier power | 25-150 W RMS |
| Nominal impedance | 4 ohms |
| Sensitivity | 87 dB at 2.83 V/1 m |
| Frequency response | 42 Hz-30 kHz at -6 dB |
| Dispersion | 100° horizontal × 80° vertical at -6 dB from 2 to 17 kHz |
| Crossover frequency | 1.6 kHz |
| Enclosure | H-shaped bracing and front-firing bass-reflex port |
| Control | High-frequency level control |
| Connections | Two pairs of gold-plated terminals with jumpers |
| Finish | Satin walnut or black walnut veneer |
| Grille | Dark blue with walnut finish; black with black walnut finish |
| Dimensions with grille | 419 × 260 × 227 mm |
| Weight per speaker | 10.98 kg |
| Shipping weight | 25.5 kg |
| Recommended stand height | 609 mm |
| Warranty | 5 years |
FAQ
Is this product sold as one speaker or a pair?
The JBL 4309 is supplied as a pair. The stated weight of 10.98 kg applies to one speaker, not the complete pair.
How do I connect the speakers with a single cable?
Use one pair of terminals and leave the jumpers in place. The jumpers connect the terminal paths for both frequency sections.
What type of amplifier should I choose?
The amplifier must operate reliably with a 4-ohm load. Use the specified recommended power range of 25-150 W RMS as your guide.
Should the high-frequency controls be set identically on both speakers?
Start with both controls in the same neutral position. Assess any subsequent adjustments from the main listening position.
Where should I place these speakers?
Stands measuring 609 mm high are the recommended starting point. Adjust the distance from the walls and the toe-in symmetrically to suit the acoustics of your room.
