Originally Posted by jim19611961
What does your RTA look like with no sweep?
I have never tried a RTA graph. New to the REW program and havent even thought of trying that, or knew what that test did.
At lunch I muscled up and moved my 200lb sub into my bedroom, which is roughly (didnt take measurements of room size) somewhere around 12 to 14 x 12 to 14 x 8ft tall. Its quite small. I hooked one sub up to a extra receiver I had laying around. The strange thing that I found was that with the door closed I had a very flat response from like 20-30hz down to 6-7hz. If I opened up the door I had a peak again around 8hz. Now I was doing this just to see if my living room is the cause for the bump down low. I had the sub in front of my dresser that has our tv on it. It was the only place I could put it in the room and the frequency response from like 40-50 on up took a big nose dive, which is definitely from just improper placement. But, that wasnt what I was trying to learn about. I really should have posted these graphs while at lunch but didnt have time. I can later if people want to see them? BTW I did put the mic in many different locations. A few of them right up to the cone of the driver.
With this peak I am getting when there is a entry way into a hallway or another room goes against everything I have learned as far as room gain from subs, especially sealed subs. My subs are sealed Cap S2's. With my small hallway opening to the front left of my living room going to the kitchen, I would have never thought of getting a bunch of gain anywhere down low, especially the one I get on my graphs.
With my talks with a Cross Spectrum tech, he said in some rooms a entry way to another room of hallway can cause a sudden rise in frequency response in the lower frequency range (he called it some name, that I cant remember. Maybe, thats what I have going on here. That graph with the door closed was silly flat down low unsmoothed. Soon as I opened the door any the hump came back.