Wednesday, June 04, 2008

The New Toys for Calibration

I ordered an MFW-15 Sub from AV123 on May 7. Not sure when it will be delivered, as they are backorder because of their popularity right now. This will allow me to have a dedicated LFE channel instead of using the SuperCubes built into the DefTech 7001's. The DT's will then be free to handle the main fronts on their own.

In preparation for the arrival of the MFW-15 sub, I started reading and learning more about tools for sub calibration. After doing some research at a couple of the forums, I downloaded Room Equalization Wizard software and purchased an external CreativeLabs Live24 USB soundcard for my old laptop. I tinkered around with the software long enough to know I really liked it and decided to take the next step and purchase a Behringer SSP 1124P Equalizer (BFD) and M-Audio USB to Midi dongle last night.

I got everything set up last night and started taking measurements and downloading filters to the BFD through the Midi device. Amazing what you learn from looking at the graphs and playing with the filter combinations.

I think I have it figured out well enough that when the MFW-15 arrives I will be able to tune it in. Right now I am just playing around with the front tower subs to get a feel for how everything works. This is going to be a very valuable tool in positioning the sub and knocking down some of the room modes.

From what I have gathered so far, there are 3 room frequencies that will be problematic. The first occurs down around 28 Hz. This is a huge bump in the graph of almost 15 dB. The next two occurs further up and are more on the magnitude of 6-7 dB. Definitely need to get the corner bass traps in place to tame things down and smooth out the response.

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