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Booming Tunes

Happy Holidays to all the Goners. This afternoons quandry: How do you reduce the bass output of a monitor speaker? My current monitor rolls at about 65-70 hz My room has a boom at about 60 hz (11x14) All the better moniters have extention to 40s to 50s. I have subs but I don't want to EQ the monitors with hi pass. The speakers are placed according to Cardas and have min boundry reinforcement and the speaker cable is as small as I think I can get Also put a sock on the port but that leaned out the mids too much. Thanks in advance for your suggestions. And may powdered sugar fall gently upon your ears this evening!
lewhite
martykl
3,578 posts
 
BTW, the Sunfire CRMs are more than decent speakers at their price point, but I suspect that they might be a difficult load for a 300b amp.

Marty
audiokinesis
2,737 posts
 
a) Position the monitors about 56 inches out from the wall behind them. The energy bouncing off the wall will arrive out-of-phase with the direct sound at about 60 Hz, hopefully causing a zig where your modal room interaction is causing a zag.

b) Place your subs as close as possible to the monitors, allow some overlap in the crossover region, and adjust your subs so that they are 180 degrees out-of-phase with your monitors in the crossover region. Find this setting by placing the monitor on the floor woofer-to-woofer with the sub, and playing test tones. The deepest null is the correct setting.

c) Reduce the output from your monitors' ports by stuffing fiberfill or open-cell foam into the port. Open-cell foam is foam that you can breathe through.

d) Reduce the tuning frequency of your monitors by inserting a somewhat longer (if possible), smaller-diameter plastic tube into the port. Wrap at least one end of the tube with enough electrical tape to give a reasonably secure friction fit.

Duke
dealer/manufacturer
lewhite OP
156 posts
 
Sorry I havn't been around but the dog died. She was my tweeter reviewer. Thanks Marty and Duke. After reviewing my speaker position I found that they were 54 inches away from the back wall instead of 64 inches. I moved them to 62 inches because that moved them 8 inches closer to the listening position But guess what that did to the 'you are there instead of they are here' illution. More immeadacy and less room acoustics. It's also greatly reduced the 60 hZ boom to manageable levels. Now I'm going to try overlaping and invert and see where that leads. But I think port mods hold a lot of promise. I'll let the SMS1 clean up the remaining mess

Thanks all and may powdered sugar fall gently upon your ears tonight!
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