Originally Posted by julaha
im in the midst of fine tuning my subwoofer (impact 12) with the rest of my system. being quite a noob, i will like some recommendations on how i should set the dial of the low pass frequency at?
My speakers that will be matched with are rated "Frequency response 60 Hz - 50 kHz" , so i was thinking i should perhaps set my subwoofer somewhere around 65hz?
But the dial for the impact12 low pass frequencyl starts at 50hz at the 7oclock, and 80hz at 12 oclock, and 200hz at the 5oclock. It doesnt make sense to me that even with equal spacing between 50hz to 80hz and 80hz to 200hz, having the same equal 4 spacing but each spacing represent a different range..
Currently its set at 11 oclock..
Anyone able to share some advice on how to proceed further, whether what tracks should i play , and look out for to further tune my subwoofers?
I will assume that you are connecting the impact series subwoofer to a home-theater receiver and are setting up a multi-channel surround sound system. In this case you would want to set the crossover control on the back of the Subwoofer to 200Hz or direct. The reason being we are going to control all bass management in the receiver rather than relying on the subwoofer. In a basic home-theater setup, managing the bass in the pre-amp stage of the receiver will typically yield the best system performance.
Now for the settings in your receiver.
1. Set the speaker selection to small not large or full
2. Depending upon your system, you may be asked to provide a crossover point for your small speakers. Given your specifications, I recommend setting the speaker crossover settings to 120Hz. Assuming a 12dB/ Octave slope this should give a good crossover range between your mains and subwoofer.
3. Next you will have an LFE crossover setting, again given your system, I would set this between 100-120Hz.
It is a common mistake to set the crossover points at or near the lowest stated speaker frequency response specification. The reason this is such a common failure is the common misconception that a crossover filter acts like a cut filter. A cut filter would cut out all frequencies at a specific frequency, where the crossover rolls off the frequency response depending upon the configured slope. Most standard A/V gear will come equipped with a 12 dB per octave slope, though some may have an even gentler 6dB per octave. To put this into a frame of reference, 10dB is approximately twice or half the perceived volume depending upon whether you are plus or minus. So setting your crossover at 120Hz will roll off bass to the main speakers, by the time you get down to 60Hz the signal strength to your main speakers will be approximately half the volume. This should allow a smooth transition of bass signals between your subwoofer and your main speakers.
Disclaimer: As with all things audio your individual equipment, setup, and preferences will affect your results, there is never any one "right" answer and you should always do what sounds best to you. Experimentation will yield the best results, you should always go with what sounds best to you and not what someone else's belief of what is correct or not. Feel free to seek advice as a starting point, but at the end of the day it is your system and you're the one who will be listening to it. All that matters is that you enjoy your sound system.