If you can't delay by milliseconds but have to enter distances, enter 5 meters sub distance in addition to whatever you measured in step 1. If you don't know your sub's electronic delay, enter 15 ms as a starting point. Enter the delay you found in the previous step, and add 12 ms delay to that number.If you can't find it, proceed to the next step. Usually you can find this by contacting the manufacturer. Find out the delay caused by electronics in your particular sub model.If you use several subs, do the following steps for one sub at a time (disable the other one). Use the distances from the tweeters/front of the speakers, and from the back wall/corner of the sub(s). In the Lyngdorf, input accurate distances from the main listening position.Touch and hold to lock onto the crossover frequency. The app I'm using is called FFT Plot for iPhone, and I've selected the following settings: weight 'Flat', FFT size '16384', Average 'Infinite' or 'slow' (reset each time you adjust delay). It doesn't matter much which one you get, as long as it can give a graph representation of the sound in your room. Get a Fast Fourier Transform (FFT) app for your phone, so you have a visual representation to go by.Minimal version: Skip the time alignment check if your crossover is at 80 Hz and the final delay is between 5 and 15 ms. Here's a relatively quick and reliable way of doing it yourself. Try it for yourself! Luckily, Lyngdorf stuff allows us to account for all this, although not automatically. If the harmonics arrive at your ears several milliseconds before the fundamental, that's going to sound very messy indeed. What does that mean? Every sound, say a bass drum, consists of a fundamental frequency – that's the one with the most sound energy – and a spectrum of overtones, 'harmonics', that stretches way up in the treble. Simply connecting a sub without taking this into account messes up the relation between the fundamental and its harmonics. 5 to 15 milliseconds generally, and sometimes even more. I've tidied up a bit and added a general pointer about what delays to expect.Īctive subwoofers are inherently slow, much slower than you might think. This sounds as tight as the proverbial elephant’s whatsit in my room at 100hz global crossover and appears to validate the methodology put forward in this excellent post by here:įrom with thanks! and also to as I understand! That’s a delay of about 8ms between sub and mains. I then end up (adding the 10ms) in V1 with this:. I need to add 10ms to each speaker and set the sub at 2.79ms (exact number arrived at by hours of listening and testing) to get the timing to sound spot on - verified as far as I can in REW. Using version 1 I get something similar although it sets my centre at 0.0ms and applies a slight delay to the sub.
That’s difference of just 2.87 ms delay between sub and mains.
I am still not getting sufficient delay between subs and mains. I’ve just been looking at the ms distances that Dirac arrives at using V.2.5.2 and I’m still not convinced by these. We can also perhaps look at the way Dirac Live Bass management calculates and applies its crossovers (by speaker group) and whether the use of multiple crossovers set lower than 80hz is a good or a bad thing! I intend to measure the distance between my listening position and my mains and sub to this post later once I have had a chance to measure this distance accurately. In addition, the delay of the mains as compared with the sub may need to be increased even further than that to allow for additional latency caused by the dsp and amplifier circuits of the sub(s) themselves which will need to be obtained from each sub manufacturer.įor the purposes of reference I am using one sealed SVS SB3000 subwoofer and you will note that Ed Mullen from SVS has confirmed that the fixed latency of this sub is 5-6ms. This is to allow for the additional time for the lower frequencies of the sub (which travel at a lower speed) to catch the higher frequencies of the mains so that they both arrive at the listener contemporaneously. In his paper Barry advises that a fairly substantial delay to the mains as compared with the sub in the range of 10-12ms be set as a starting point. According to my interpretation.but I am happy to be corrected!.
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