Quote:
DrWho wrote:
 That doesn't work. The sub is bandwidth limited so the peak in the Energy Time Curve is going to be naturally delayed....aligning the peak of the other speakers to that of the sub will delay all of the other speakers for too long, which is going to introduce phase cancellation in the crossover passband.
The guys over at Syn-Aud-Con had a great article describing this limitation of the ETC. I'll see if I can't find it and post it. The nice thing about it is that it provided a way around it.
Since it seems you're more worried about the delay through the crossover, a very easy way to measure delay would be to measure your crossover directly. Download Audacity, which is a free multi-channel recording tool (or pick any stereo recording device of your choice). Then what you do is create a sound sample of a square wave, or click track or whatever....something that has a vertical rise at the beginning. Burn this sound to a CD and play it through your system. On the left channel of your recording device, record the direct output from the CD. On the right channel of your recording device, record the direct output from the crossover. You will first see your sound show up on the left channel and then later on the right channel. The time readout of your software will be able to give you the time offset. It'll probably take you 15 minutes to get everything set up and ready to test, and then just a few seconds for every channel of your crossover. |
Hi Mike
haven't seen you for a while!
I'd love to be able to do this accurately, alas my computer skills in using some of these programs are my achilles heel. Do you know of any 'tutorial' which, with a bit of application on my part, may get me through it?
Maybe most people learn this stuff through osmosis..I doubt it's taught in school. Or their work? Anyway, as i only got a computer itself about two years ago, this stuff just sends me gaga. A good book? Beats me how people are able to pick it up.
I'm proud that it only took me a couple of months to work out REW!! ha ha ha