Originally Posted by derrickdj1 Help and suggestions needed!
I setup the two subs and used the Dayton amp for EQ. I know nothing about EQ'ing the subs so be gentle, lol.
SS 18.1 Graph.JPG 1867k .JPG file
Radio Shack meter on slow and C weight
AVR at -10 and sub level in avr at -4
Peak 35 Hz 101 db
Peak 70-100 Hz 109 db
Null 50 Hz 90 db
Dayton amp settings:
xo all the way up
frequency 20 Hz
leve -4 (-16-6)
Bass boost on and subsonic filter off
Pioneer MCACC engaged
subs 1/8 spaced
See crude attached graph
Thanks for help and suggestions
Here is your graph:
I see lots of problems with this graph. However, before I can comment, I need to know what the "signal" was that was used to generate the graph. It almost looks hand-drawn. Did you use individual test tones, measured by an SPL meter and then graphed on graph paper? If so, what individual test tones did you use? What increments were they in? RealTraps has individual test tones in 1 Hz increments available for free: http://www.realtraps.com/test-cd.htm
It is perfect for this application.
Did you use any correction factors for your RS SPL meter, or is this the raw response without correction? Which version of the RS SPL meter do you have? There are different correction tables for different versions of the meter. http://www.avsforum.com/t/505236/spl-meter-correction-tables
Next question, would it be possible to pull one of the subs out to the middle of the room and perform a "close mic'd" graph? This will tell us the "baseline response" of the subwoofer with little, if any room interaction. Once we know what the sub's native, (inherent), response is, we can then sort out the room effects from the native response. To do this, place one sub is the middle of the room, as far away from the walls as possible. Turn off or disconnect the speakers and just run the one sub. Turn off all EQ
in the amp. Place the mic about an inch from the driver and repeat the above measurements. (You may need to turn the sub volume down so you don't overdrive the SPL meter mic.)
In your list of settings, you have the following: "frequency 20 Hz, leve -4 (-16-6)" What does this mean?
Do you have any way to get setup with REW? The new version uses a USB mic and is supposed to be much simpler to learn and easier to run: http://www.avsforum.com/t/1449924/simplified-rew-setup-and-use-usb-mic-hdmi-connection-including-measurement-techniques-and-how-to-interpret-graphs
(See Austin Jerry's tutorial.)