Manual KRK Systems Ergo (page 13 of 51) (English)

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11. Subwoofer Placement

Note: A properly set up subwoofer system extends the bass response of the main stereo monitors down into the 30-

Hz range, but without exaggerating bass response in the room. Improper setup may cause an exaggeration of bass

response in the room, which in turn may cause the engineer to mix in less bass energy than desired. We recommend

paying close attention when configuring your subwoofer.

Bass frequencies are largely non-directional, however that does not mean that you should ignore the subwoofer's

placement in the room. If fact, a sub's physical position in the room in relation to the floor, walls and other surfaces

radically influences its bass response. In a monitoring situation, it is desirable to place the subwoofer so that it

produces the smoothest frequency response at the listening position. In addition, since the subwoofer's output will

interact with the other monitor speakers in the room, it is important to consider the subwoofer and near-field

speakers as a total system.

If you have access to a Real Time Analyzer and a calibration microphone, then setting up the room can be fairly

painless. There are good selections of iPhone/Smartphone applications which will allow your device to measure SPL.

However, it can also be done with a generic SPL meter, or even your own ears, once you know what to listen for.

What you are attempting to do is find a place in the room where the subwoofer interacts smoothly with the acoustics

to even out the bass response at the listening position. One way to do this is to reverse the normal position of the

subwoofer and listening spot by temporarily moving the subwoofer to your seat position in front of the console. Then

play back pink noise in the 30 to 80 Hz range or music with robust bass information. Now by moving the SPL meter (or

your ears) around the various potential speaker positions in the room, you can listen for where the bass sounds the

loudest. That is where the speaker loading would potentially be at its greatest. Once you find the optimal spot, place

the subwoofer at that position and listen to it from the console position. Even without an SPL meter you can then use

stepped band-pass, pink noise and sine-wave sweeps to evaluate how even the bass response is. Move the subwoofer

around a foot at a time until the bass response is as even as possible at the listening position.

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KRK Systems Ergo Manual

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