Les trois caissons de graves actifs de la Série KS disposent d'un puissant DSP qui vous permet de régler un certain nombre de paramètres utiles. Parmi eux, la fréquence de coupure (filtre passe-bas). Pour adapter parfaitement votre caisson de graves KS à vos enceintes, vous devez choisir une fréquence de coupure appropriée (80 Hz ou 100 Hz) et appliquer le réglage correct au caisson de graves comme aux enceintes. Mais que se passe-t-il si vous ne le faites pas? Regardons ça plus en détail :
- Caisson de graves réglé à 80 Hz et enceinte à 80 Hz: très bon couplage des deux réponses, avec des basses puissantes. De plus, le réglage de la fréquence de coupure à 80 Hz réduit les indices de localisation des basses fréquences.
- Caisson de graves réglé à 100 Hz, enceinte à 100 Hz: couplage homogène de la fréquence de coupure, et plage dynamique supplémentaire pour l’enceinte qui reproduit une bande passante audio réduite.
- Caisson de graves réglé à 100 Hz, enceinte à 80 Hz: les deux unités reproduisent désormais la même énergie entre 80 Hz et 100 Hz, ce qui génère un niveau de graves excessif.
- Caisson de graves réglé à 80 Hz, enceinte à 100 Hz: la plage de la fréquence de coupure ne présentera pas une réponse en fréquence linéaire et régulière. Il y aura une perte de -5 dB centrée autour de 90 Hz, ce qui se traduira par une dégradation dans la reproduction des basses.
Il est donc important de régler correctement votre fréquence de coupure pour tirer le meilleur parti de votre caisson de graves et de vos enceintes QSC.
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How bout speakers at 125 hz / subs at 80
Thanks for your message. A top loudspeaker high-pass set at 125 Hz and a subwoofer low-pass set at 80 Hz will induce a loss in low frequency reproduction level between these two frequuencies, as discussed in the article. The wider the frequencies are set apart, the more LF loss you will perceive. Hope this clarifies your question. Thanks for reading! Best regards.
My question concerns the Presets on the K.2 mid-high boxes (K10.2s in particular.) I like the “Studio Monitor” preset best, I use it for live shows. But obviously some low end has been filtered out. How do I know where to set the crossover on my subs? WHAT IS THE EXACT ROLLOFF THAT’S BEING USED ON EACH PRESET? WHY DOESN’T QSC SHARE THIS INFO? WHO CARES IF IT’S “PRIORITY INTELLECTUAL PROPERTY” – WE PAID FOR THE BOXES, WE NEED TO KNOW!
Hello and thanks for your note. The Studio Monitor preset on QSC K.2 Series has been designed to provide a very flat frequency response across the full bandwith of the loudspeaker. There is actually no LF that is filtered-out, but a rather flat bass response that is implemented. K2 Series feature 11 different presets, and each one has different set of contour equalization, which means that there are differences in response magnitude (levels), but no changes in the actual loudspeaker LF roll-off. The lowest possible high-pass setting is 80 Hz (applicable with all presets), with 100 and 125 Hz also available. So, the question is to find out what low-pass setting is available with your subwoofer and find a matching crossover frequency in the 3 choices provided on K.2 Series. The bottom line is that you can mix and match any preset with any crossover setting, without any loss of low frequencies. Hope this is helpful, and thanks for reading. Best regards.
I just bought a DBX Drive Rack PA2. I am trying to set up the cross over with my k8.2 and ks112. Do you know the settings for setting up an external crossover. Any help would be great.
Hello Rudolf, and thanks for your question. Whatever model of external crossover you use, the most important principle to follow is to set both low-pass and high-pass at the same frequency with the same roll-off slope (24 dB/octave, etc). You can select 80 or 85 Hz for K8.2 and KS112, and the system will work very well. Hope this is useful. Best regards.