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Subwoofer "rumbling" between decibel levels
6 replies to this topic
Posted September 05 2012 - 06:25 PM
I have a home theater setup with a receiver and subwoofer. The sub "rumbles" (sounds like an earthquake) at certain low decibels. I tested the sub to see when the offensive noise happens, and it occurs with any frequency between 15 and 30 decibels. Under 15 and over 30 and the bass is clean and clear. To fix this, is an FMOD high pass filter the right way to go? Everything I've read about FMODs or hp filters in general says to place it between the sub and the amp, but I don't have an amp in my setup. Getting to the actual speaker to pad it or anything similar is impossible based on the construction of the sub. Oh, and the model of sub is Sony SA-WMSP75. Thanks!
Posted September 05 2012 - 06:38 PM
Do you mean 15-30hz?
Posted September 06 2012 - 11:46 AM
Yes, that was a typo. 15-30Hz
Posted September 06 2012 - 12:35 PM
Based on pictures of that sub on Ebay, I can tell it is tuned much higher than 30hz. Playing anything below the tuning frequency unloads the driver and risks destroying. Since it is a passive sub, you can't use an FMOD either. You would have to design a passive crossover which would cost more than the sub is selling for on Ebay.
Posted September 06 2012 - 08:39 PM
Appreciate all the great feedback! So it sounds like I need to invest in a new sub. I have an Onkyo Tx-Sr508 receiver. Any sub you would recommend? Trying to keep it under $250 and not run into this rumbling at low hertz again. Thanks!
Posted September 06 2012 - 09:04 PM
The only subs in your price range worth looking at are all made by BIC. V1220, F12, RTR EV1200(essentially a version of the F12 for the headbangers crowd) and occasionally the VK12 and PL200.
Posted September 16 2012 - 05:59 PM
Thanks big time. I bought the V1220 and don't regret it! This sub is awesome. Thanks!
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