Axiom Home Page Forums General Discussion Technical Questions Graphs multiple subs multiple seats.

ha ha

I got a very similar problem with the SMS, which I was not trusting, or trusting myself using it. I had it in the loop, and by looking at the graphs I got, I thought I lost the money. I had long nights and neighbors pissed by the night tests (after work) until I got some decent EQ, but I am not satisfied.

Interesting to see your findings. We are going to certainly learn from them. Tuning both subs sound more difficult that I initially thought.

I got the SMS and started to play around with the EP500 in several positions on the room and different EQ, and trying to figure out if a second sub will improve my room sub acoustics. I really want the second sub, but until I am positively sure I can get them tuned properly, I am not ready to buy it.

Well, if we're talking about a 5.1 system with speakers which are not full range, then at first I thought, sit each speaker (not the center) atop a nice subwoofer and twiddle with the cross-over frequencies. That should approximate 4 full range speakers.

Then I thought, how long is a 20Hz sound wave? Googled the matter and was surprised to find the answer is 17 meters. Wow. That's larger than most rooms. So, I googled, how long is a 20Khz wave? 2/3 of an inch they say. Zounds.

I suppose the idea behind time corrected speakers is that each frequency arrives at the listener's ear at about the same time. I suppose we could move the subwoofer(s) into the next room. Inconvenient and peculiar.

Maybe a 3 dimensional tesseract type layout would work? What? did someone say audiophiles are peculiar?

Great. Thanks a lot 'Quack. As of today every time a CD ends all I can hear is that damn sub hum.

I'm sure in my post in the water cooler forum, that there is an electrical outlet sold to eliminate this hum. It better in order to justify the cost.

sorry doorman. I did plug my 2 350's into the same outlet and now the hum is much better.

When I was in school we did a field trip up to the U of T Aerospace Institute north of Toronto (well, it's the middle of Toronto now but it was north of the city back then). One of the things that impressed me was a sonic boom simulator -- basically a long tapered tunnel maybe 100 feet long and ~8 feet high at the end, tapering to a few inches at the other end. Your basic horn-loaded subwoofer.

Anyways, there was a metal diaphragm at the small end of the tunnel and the air pressure was cranked up behind the diaphragm until it burst, channeling the pressure impulse down the horn to the other end where we were standing. I think they used Saran Wrap or something similar for the demo (to avoid imploding eardrums) but it was still pretty impressive.

Randy, you have lots of open space around your house, right ?

Yup, 2.5 acres of grass surround the house.

2.5 acres of grass? Now we know how can afford all this equipement!!

Bob?, Bobs not here man.....