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Polk Audio DB1240 English Preconditioning Period, Optimal Crossover Setting, Inverting Phase

Models: DB1040 DB840 DB1240

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ENGLISH

PRECONDITIONING PERIOD

db Subwoofers will achieve even greater performance once they are thoroughly broken in. To break in your new db Subwoofers, play 20 to 30 hours of music at moderate levels.

GET MORE INFORMATION ONLINE AT POLK UNIVERSITY: www.polkaudio.com/car/faqad/index.php

OPTIMAL CROSSOVER SETTING

We recommend using an active crossover with a 12 to 18dB per octave low pass filter slope, and setting it to an initial setting of 80 to 90Hz as a good starting point. This is an optimal crossover setting on most vehicles.

INVERTING PHASE

Depending on the placement of your subwoofer enclosure and associated components, it may be necessary to invert the phase of one or another of your system’s connections in order to gain better subwoofer/mid-range blending. Inverting the phase simply means switching the positive connections with the negative connections at the amplifier. If you choose to do this, invert the phase of only one set of speakers (either your mains, or your subs, never both).

LOW FREQUENCY CUT-OFF FOR

MID-RANGE SPEAKERS IN

SYSTEMS WITH SUBWOOFERS

Now that you have a subwoofer in your system, you may want to decrease the amount of bass going to your midrange speakers. This will get you better mid-range sound and increase the power handling. There are two ways to roll off the bass before it gets to your mid-range speakers. One way is to use a “bass blocker,” a capacitor placed in series with the speaker input. Bass blockers are installed in series,

one end connected with the positive lead from your amplifier and the other end connected to the positive lead of each of your speakers. Bass blocker capacitors (200 microfarad @ 100V, non-polarized) are available at any Radio Shack or electronic parts supply house. The other route is to use an electronic crossover device that allows filtering below 100Hz or so. Find these devices at your authorized Polk Audio dealer.

TECHNICAL ASSISTANCE OR SERVICE

If, after following these hookup and installation directions, you experience difficulty, please double check all wire connections.

Make certain your electronic equipment is operating correctly by hooking up another speaker to the speaker output. For example, if you are not getting sound from the left channel speaker, connect the right channel speaker to the left output. If you still get no sound from that side, the problem is in your amplifier or source electronics. Should you isolate the problem to the speaker, contact the authorized Polk Audio dealer where you bought your speakers. Authorized Polk Audio dealers are the best source for advice and assistance. Polk Audio’s Customer Service Department is available from 9am–6pm, EST,

Monday through Friday, at 800-377-7655

(US & Can only, outside the US call 410-358-3600). Please do not hesitate to call us if you have questions about your speaker system.

You will find additional information, informative articles, manual updates and cool stuff to buy that has “Polk Audio” all over it by visiting: www.polkaudio.com.

FRANÇAIS

PERIODE DE RODAGE

Les subwoofers db seront encore plus performants après une période de rodage convenable. Pour bien roder vos nouveaux subwoofers, jouez de la musique pour 20-30 heu res à volume modéré. Ensuite allez-y à fond la caisse!

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REGLAGE OPTIMAL D’UN SEPARATEUR

Nous recommandons l’utilisation d’un séparateur actif avec filtre passe-bas réglé à une fréquence de 80 - 90Hz avec une pente de 12 à 18dB par octave. C’est le réglage optimal pour la plupart des voitures.

INVERSION DE PHASE

Selon l’emplacement de votre subwoofer en relation avec les autres haut-parleurs, vous devrez peut-être inverser la phase d'un des composants de votre système pour obtenir un meil- leur mélange subwoofer-médiums. Inverser la phase signifie tout simplement d’inverser le fil positif et le fil négatif des bornes de l’amplificateur. Si vous décidez d’inverser la phase, n’inversez la phase que d’un seul groupe de haut-parleurs (soit les haut-parleurs principaux, soit les sub-woofers, jamais les deux).

COUPURE DES BASSES FREQUENCES ENVOYEES AUX TRANSDUCTEURS DE MEDIUMS (POUR LES SYSTEMES UTILISANT UN SUBWOOFER).

Maintenant que votre système est muni d’un subwoofer, vous désirez peut-être réduire les basses fréquences qui sont envoyées à vos transducteurs de médiums. Ceci améliorera le son des médiums et augmentera leur capacité de puiss-ance. Il y a deux façons d’atténuer les basses fréquences avant qu’elles n’atteignent les transducteurs de médiums. La première est d’utiliser un filtre-condensateur placé à l’entrée du haut-parleur. Ce condensateur est connecté en série, une de ses extrémités connecté au câble positif de votre ampli- ficateur et l’autre connecté à la borne positive de votre trans- ducteur. Ce type de condensateur (200 mfd (microfarad) @ 100V, non-polarisé) est disponible dans la plupart des magasins d’électronique comme La Source/Radio Shack. L’autre façon d’atténuer les basses fréquences est d’utiliser un séparateur électronique qui atténue les fréquences sous les 100Hz. Vous pouvezvous procurer ce type de séparateur chez

M o r e I n f o @ w w w . p o l k a u d i o . c o m / c a r

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Polk Audio DB1240 English Preconditioning Period, Optimal Crossover Setting, Inverting Phase, Français Periode DE Rodage
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DB1040, DB840, DB1240 specifications

Polk Audio is renowned for its commitment to delivering high-quality audio experiences, and their DB series of car subwoofers is no exception. The DB1240, DB840, and DB1040 are designed to provide powerful bass performance, making them ideal for car audio enthusiasts who prioritize sound clarity and depth.

Starting with the DB1240, this 12-inch subwoofer features a peak power handling of 1200 watts and a RMS power handling of 400 watts. Its dynamic balance woofer cone is crafted from a durable polypropylene material, ensuring efficient sound reproduction with minimal distortion. The DB1240 also employs a high-temperature voice coil that enhances heat dissipation, allowing for extended playtime without compromising sound quality. The subwoofer's rubber surround contributes to its longevity, enhancing flexibility and strength while ensuring a tight seal for improved bass response.

Next up is the DB840, a compact 8-inch subwoofer designed for those with limited space but an unwavering desire for powerful bass. With a peak power handling of 800 watts and an RMS power handling of 200 watts, the DB840 doesn't compromise on performance despite its smaller size. This subwoofer uses a similar dynamic balance woofer cone technology and robust rubber surround, allowing it to produce punchy bass that is both clear and impactful. Its compact design makes it an ideal choice for smaller vehicles or applications where space is a constraint.

Finally, the DB1040 is a 10-inch subwoofer that strikes a balance between size and power. With a peak power handling capability of 1000 watts and an RMS rating of 300 watts, the DB1040 provides a deep, resonant bass tone that can fill any car interior. Like its counterparts, it features a polypropylene cone and high-temperature voice coil, ensuring reliable performance and fidelity under various conditions. The subwoofer's design also incorporates a vented pole piece to optimize airflow, which helps in maintaining performance during extended listening sessions.

All three models feature a corrosion-resistant design that helps withstand the rigors of automotive environments, making them suitable for marine applications as well. The DB series subwoofers can be used in both sealed and ported enclosures, giving users flexibility in terms of installation and tuning their bass response.

In conclusion, the Polk Audio DB1240, DB840, and DB1040 subwoofers exemplify Polk's dedication to audio quality. With their dynamic balance technology, robust power handling capabilities, and durable construction, these subwoofers are poised to elevate any car audio system, ensuring an immersive listening experience no matter the genre of music. Whether you're a casual listener or a dedicated audiophile, Polk's DB series has models that cater to a variety of preferences and requirements.