Model: 51KSC6904
This manual provides detailed instructions for the installation, operation, and maintenance of your Kicker KS-Series 6x9 Coaxial Speakers (Model 51KSC6904). Please read this manual thoroughly before attempting installation or operation to ensure proper use and to maximize the performance and longevity of your speakers.
Before beginning installation, please verify that all the following items are included in your package:

Image: Pair of Kicker KS-Series 6x9 Coaxial Speakers with grilles.

Image: One Kicker KS-Series 6x9 Coaxial Speaker with its protective grille.

Image: One Kicker KS-Series 6x9 Coaxial Speaker without its grille, showing the cone and tweeter.

Image: A single protective grille for the Kicker KS-Series 6x9 speaker.

Image: Kicker branded can koozie, included as a bundle accessory.
The Kicker KS-Series speakers feature a thin-mount design, allowing them to fit easily behind most factory grilles and in various vehicle applications. Before mounting, ensure the chosen location provides sufficient clearance for the speaker's depth and diameter.
Use the provided mounting hardware to secure the speakers firmly in place. Avoid over-tightening screws, which can damage the speaker frame.
These speakers have a rated impedance of 4 ohms. Connect the speakers to an amplifier that is stable at a 4-ohm load and provides a recommended power output of up to 150 watts RMS per channel. Ensure correct polarity (+ to + and - to -) when connecting the speaker wires to both the speaker terminals and the amplifier terminals. Incorrect polarity can lead to reduced bass response and poor sound imaging.
It is recommended to use high-quality speaker wire of appropriate gauge (e.g., 16-gauge or thicker) for optimal power transfer and sound quality.
Once installed, connect your audio source to the amplifier. Cuminciate cù u amplifier's gain settings at their minimum and gradually increase them until the desired volume is achieved without distortion. These speakers are designed to deliver clear and detailed audio reproduction across a wide frequency range.
Periudu di robba: Like many audio components, these speakers may benefit from a break-in period. Play them at moderate volumes for several hours before attempting to play them at their maximum capabilities. This allows the speaker's suspension components to loosen and perform optimally.
If you experience issues with your Kicker KS-Series speakers, refer to the table below for common problems and their solutions:
| Prublemu | Causa Possibile | Soluzione |
|---|---|---|
| Nisun sonu da i diffusori | Cablaggio sciolto o scollegato Ampl'alimentatore ùn hè micca accesu Incorrect input selection on head unit | Check all speaker and ampcunnessioni di lifier Verificate amplifier power and fuse Ensure correct audio source is selected |
| Sonu distortu o pocu chjaru | Ampguadagnu di l'alimentatore troppu altu Cortocircuiti i fili di l'altoparlanti Conu di l'altoparlante/surround dannighjatu | Riduce ampguadagnà lificatore Inspect wiring for shorts Contact Kicker support for speaker inspection/replacement |
| Bassi debuli o inesistenti | Incorrect speaker polarity I paràmetri di crossover sò sbagliati Insufficiente ampputenza di lifier | Verify speaker wire polarity Adjust head unit or amplifier crossover settings Assicuratevi amplifier provides adequate power |
| Sonu intermittente | Connessioni lasse Surriscaldamentu amppiù vivu | Verificate tutti i cunnessione di cablaggi Assicurà una ventilazione adatta per amplifier; reduce volume |
| Feature | Specificazione |
|---|---|
| Disegnu di Speaker | Coassiale a 2 vie |
| Dimensione woofer | 6x9 pollici |
| Dimensione Tweeter | 1 inch |
| Impedenza nominale | 4 Ohms |
| Cunsigliatu Ampputenza di litru (RMS) | 150 Watt |
| Sensibilità | 92 dB |
| Risposta di Frequency | 30-21k Hz |
| Diametru di u Foru di Montaggio | 5-11/16 x 8-7/16 inches (14.45 x 21.43 cm) |
| Top Mount Depth | 3-3/16 inch (8.1 cm) |
| Bottom Mount Depth | 3-11/16 inch (9.37 cm) |
| Tweeter Protrusion | 1/16 inch (0.16 cm) |
| Materiale Woofer | Polypropylene with Rubber Surrounds |
| Materiale di tweeter | Silk-dome |
| Pesu di l'articulu | 15.9 liri (7.21 kg) |
| Dimensioni di u pacchettu | 18.63 x 12 x 4.44 inch (47.32 x 30.48 x 11.28 cm) |
Kicker products are designed for durability and performance. For specific warranty terms and conditions, please refer to the warranty card included with your product or visit the official Kicker websitu. Conservate a vostra prova d'acquistu per e richieste di garanzia.
If you require technical assistance, troubleshooting beyond this manual, or warranty service, please contact Kicker customer support through their official website or authorized service centers. Provide your product model number (51KSC6904) and a detailed description of the issue when contacting support.
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