DIY Subwoofer: Would like some feedback!

[hddummy]

Sure. The stand is build mostly out of 3/4 plywood. The lower half is painted black to blend in with the frontside rack and the upper half is paintd the same color as the walls. I don't have any additional pictures right now, but I sketched this up really quick to give you a cartoony idea of the overall shape.



Again, the idea was to have a really solid stand for the screen that holds in from behind rather than relying on the stand that comes with the screen. I have two very rambunctious dogs, and i was just not liking that stock stand. I'll see if I can take some more detailed pics soon.

The sreen is attached to the two aluminum angles you can see in the picture in my first post. Those hang on a steel rod (painted black), which is attached to two aluminum arms. The whole thing has a threaded rod and some bushings to hold it all together. There are also some threaded adjustment rods to adjust the angle of the screen. you can see the threaded end of those sticking up through that flat board.

The whole thing turned out really solid. I tested it out by doing pull-ups on the black steel bar before trying it out with the plasma screen.

[Owen Bartley]

Very cool design. It looks really solid too, nice work!

[hddummy]

I had some time and decided to measure the response curve for my sub and mains. I'm using a 100Hz crossover frequency. The yellow curve is the predicted response for my sub and shifted up to best fit the SPL level I was testing at.

[Sonnie]

Those look fairly good. Can you measure the sub and mains together?

What program is that and have you considered REW?

[hddummy]

I can measure all three together. I tried REW, but the sound card on my laptop is so horrible that I can't get any output of frequencies lower than about 60Hz...even with the calibration set to cancel out sound card response.

I use a frequency generator that outputs uncompressed wave files an whatever frequency I choose. I made 50 files between 10 and 200 Hz and burned them to a CD. I just record readings manually with my RS SPL meter and input them into EXCEL. I realize that this takes about 100 times longer than the sweep method with REW, but I just don't have the hardware to do it. I really should go out and buy myself a sound blaster Audigy USB sound card, but oh well.....shrug

[hddummy]

I got my new sound card for christmas and I finally had some time to do some sweeps. Readings are in order from top to bottom on the list:
Sub only, semi near field.
Sub only, seating position
Mains only, seating position
Sub+Mains, seating Position