![]() However my amp does not have a subsonic filter and the LP filter only goes down to 40hz. I am running one x12 d4 in a box built to factory specs. I was looking at some treads about this and watch some vids on how to set the gain, LPF, and Subsonic filter. For fitting this data you need to include the LPF in the curve fitting. Hello, I am attempting to get my system tuned perfectly. For the receiver I set the mains to small and the crossover at 80Hz then just hooked REW to stereo inputs and measured the sub line output. If the polarity is wrong the lights on the EP2500 will light up. turn lpf counter-clockwise until voltage output now matches 'y'. turn lpf clockwise until it's considered 'max'. if you must have one, just look for a 2 channel active crossover that has a HPF that is able to go that low. its either built into your amp, is a feature on a head unit, is done with a dsp, or an active crossover. Maybe try it out with a 10k resistor in series first. For this article were going to be setting it to 80hz for a subwoofer. 4) you cant really buy a subsonic filter. You must use unbridged mode and also the ground (black) output from the amp must go the ground of your sound card. Even though they may only contribute less than 1dB in this range, there are several so they add up and should be considered.įor the EP2500, I just was careful with the gain setting before looping it back to my sound card. ![]() This provides the greatest accuracy in the range that you are interested in: 10-20Hz. I limited the fitting range from about the -6dB point up to about 2-3 octaves above the cutoff frequency. For high-pass frequency filters (HPF), manufacturers frequently include specifications indicating the best cutoff frequency to use. After youve set it, slowly fine-tune and listen to find the best sound. You just have to decide what part of the data is important for the fitting. 70 to 80Hz is a general rule for a car stereo sub-low pass filter (LPF) setting. I then used the solver to fit the filter cutoff frequency and order to the data. I saved that data to text and opened it up in excel. Then use that port tun number to set the subsonic. There are vids that show you how to figure it out. I used REW and a sweeps up to 200Hz to find those cutoffs. On your amp, set the LPF (low pass filter) to around 80 Hz, and if your amp has a subsonic knob, set it to 30 Hz. You need to be setting the sub sonic based on the port tune of the enclosure. ![]() Not sure about the Skar, but it’s may be -18 or -24. The LPF is at 90, so it doesn’t go down nearly as low as your previous amp (50hz) by almost a full octave. I would guess that they would be within 10% of my measurements because of combined tolerances of electrical components. First, 35hz and below will naturally be at a lower output level, considering you are tuned to 34hz. Click to expand.They will vary primarily because of component tolerances. ![]()
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