[Otto]

blue_max wrote:

Thanks Otto, great to get your view and surely worth more than the $0.02!

No problem, and glad to help.

Interesting perspective on the house curve. I always assumed you would go for flat and then apply the curve and set the filters. Doing it this way would easily allow the curve to be changed for experimentation.

The problem here is that if you start with a flat curve, it's implied that you already have filters running. Then, if you come back and re-measure to go for a house curve, REW won't know that there are already filters engaged -- therefore, the new filters that it calculates for the house curve won't work properly because once they're loaded, the original ones are gone, and its starting point thereby changed.

Aiming for your house curve from the off would mean quite a lot of work if you changed your mind about the curve. One to experiment with I think.

Nah, it's not too bad. REW is very good about hitting the target, so you don't really need to iterate through the steps much (unless you want to ). Just load a new target, mesure, let REW calculate filters, load the filters, remeasure to ensure you're happy with the result. Sometimes I find myself doing a million passes and tests and remeasures, etc. I think I do it because it's fun for me, but I know in the back of my head that it's probably really not all that fruitful to spend that much time on it. In the end, I usually just have to set it, leave it and live with it for a while. Then, it might be wise to come back in a week or a month if there's something I don't like...

I was thinking that to help fill the dips, you would increaase the volume of the sub and then filter down more. Then when you measure next time, it's based on the new sub level. As this has the previous filters applied (or should you always turn the filters off to re-measure?), it would generate a different graph.

Yep, you don't want to apply much boost (many would say no boost, but I do a little sometimes). If your sub has the headroom, just crank it way up and quash down those peaks!

Your right -- once you start to remeasure with filters engaged, you get different results. REW currently has no way of knowing what filters you have so it just assumes that you are doing a filter-free (i.e., no processing in the BFD) measurement. If you allow it to calculate filters at that point, your response will be all screwed up if you use them. Usually, after the first pass where I've let REW do the calculation, the following tweaking is minor enough to just do it by hand. Once you do it a few times, you'll have it down. And although the graphs on the screen won't be 100% correct, I still find them to be a useful guide to getting me where I need to be.

Just one other thought. Phase (0 or 180 on mine). Would you just alter this if you had issues, or is it best to work round it using 0 - maybe adjusting the delay to stop any interference with the mains. I don't really notice any difference with the phase either way.

I don't have a phase control on my sub, so I haven't been able to play around with that. If I did, I'd probably start by doing two sweeps: one with the switch at 0 and one with it at 180. Those initial two sweeps would be with the mains on. Then I'd start doing my measurements and filter settings. Get that all loaded up and remeasure with the mains on with the phase switch in both positions again. Pick the one that looks the best around the crossover point. If you have any funky interaction, especially around the crossover point, you may be able to tweak it out a little with sub delay from your pre/pro/receiver. I haven't ever had any trouble around my crossover point...

It's all becoming much clearer!

Excellent. Have fun!