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2.1 subwoofer not sounding correct

By Joshua Minett
Jan 29, 2018
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  1. I just got a used Cyber Acoustics CA3001 and the subwoofer is making almost like a lawnmower sound behind what should be bass. The way these speakers work is a single 3.5mm jack comes from the computer and is hard wired into the right speaker. A hard wired cord also connects the left and right speakers. The system runs on 9VAC 1000mA DC power. The subwoofer, which has speaker model YDDE78-9B, has an attached hard wired 3.5mm plug/cord that is plugged into the right speaker. It can be disconnected at the speaker.

    I have cleaned the 2 3.5mm plugs, and ensured that all connections are secure. I have tried using wall power as well as a plug on a grounded power strip. Plugging the subwoofer directly into the computer results in extremely quiet playback, but is still audible, and correct.

    Any ideas what I need to fix?

    The back of the subwoofer speaker

    The front of the circuit board inside the right speaker

    The back of the circuit board inside the right speaker
  2. captaincranky

    captaincranky TechSpot Addict Posts: 14,168   +3,474

    Is the speaker doing this at normal volumes? Because with too much bass boost, it might be possible to bottom out the cone, despite the fact that subs are long throw cone designs.

    Bad filter caps in the power supply could possibly introduce 60 Hz AC line hum.

    A computer's sound card (on the mobo or built in), only really has enough power to run headphones, so the subs power amp is needed.

    It probably isn't worth mentioning, but are you sure you have the computer's sound set up correctly for the 2.1 or 5.1 sound system you're trying to use?
  3. Joshua Minett

    Joshua Minett TS Booster Topic Starter Posts: 70

    The speaker does this at normal, low, and high volumes, but only when plugged into the right speaker. There is no bass boost active on my computer, and the cone is definitely not bottoming out. Similar sound, though.

    How could I check if the filter caps are bad?

    The sound card built into my MSI 970 Gaming mobo is not providing the power to the sub or speakers. There is a 9VAC 1000mA DC power cord connected to the right speaker.

    I'll check on that last bit later today, but likely that is not the issue, as I have encountered the same issue when attempting to play from my cell phone.

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