Recent content by Bryan S

OK Sam you're right about it being off topic here, I started the thread with REW questions and it turned into a general speaker design thread. I'll take it elsewhere.

I wonder if anyone would mind looking at the graph above (summed port+woofer) and give me some impressions? It seems most of the time when people are discussing baffle correction the sum ends up making a hump much lower down near F3 or the port tuning, but I've got a real drop, so that means...

OK, today I went and got a piece of 4" ABS and made a few port tubes, corresponding to 34hz, 38hz, 40hz, and 42 hz. I did sweeps of all of them, with and without fill. The fill made a big difference in smoothing things out, so I used these sweeps for my modeling, since without the fill I'm not...

Do you think tuning the port lower might show a smoother response, with less (or no) 150hz peak? I know it's got to change it just not sure. Also still very curious about the 70hz null happening where the port and woofer are 180 degrees apart, is there any way to deal with that? I thought it...

I've used a couple of calculators, here's the result of one of the calculations. It shows a pretty short port length, not far off from what I have, which is resonating at 51hz with a 1.8cm port length (the plywood baffle). For a 50hz tuning the calculator shows a pipe length of 4cm. It seems...

Thanks Sam, I'll post those .mdat files shortly (pretty clumsy on this windows rig which I only bought for this purpose). I understand your point about not being able to alter the time response of the port, so that makes me wonder if the port is wrong? I was trying to push the bass response to...

As it turns out, the calculator shows -6.4db for the port, so below are the results of the sum, and then the sum when I invert the polarity of the woofer. But I don't know how I can invert the woofer polarity in relation to the port, is there some way to do that? Makes everything smooth out like...

Thank you Sam, those are some very friendly looking measurements. I've measured as you suggest, and this is where I've ended up. Headed to a holiday picnic right now but I'll apply the scaling tool you've suggested and see where it leads compared to my arbitrary 6.4db reduction of the port. Not...

Hi all, I'm new to the forum but have been using and learning REW for a few months. Lately I've been using REW to measure a prototype speaker (Radian 5210) to move the files over to Vituix for crossover work. The measurements have been going great, but when I try to sum the port with the woofer...