Question about Boston Acoustics BA745 Computer Speakers

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Speaker/sub bass When I try to adjust my bass level using the knob on one of the speakers (the subwoofer knob), my bass does not really adjust. It is just either on or off. If it is turned all the way clockwise, its on. If i turn it less than a 1/4 counterclockwise, the subwoofer is just shutoff completely. How can I make it so that my bass can be adjusted and remain on, but just at lower levels of bass?

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Re: speaker/sub bass

Get some WD-40 and clean out your knobs. afterwards, check the wiring for fault, if all seems fine and your bass still won't work then your knobs have worn out. get them changed from a technician... they wont charge much for such work.

Posted on Mar 15, 2013

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Re: speaker/sub bass

If you dare to open up the case, squirt some contact cleaner into the internals of the variable resistor. If none of this makes sense, youre better off taking it to a repair shop.

Posted on Apr 08, 2007

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Re: speaker/sub bass

Hi, it is possible that the sub volume control is worn out. If your particular brand/model uses the rotary/wiper type (variable resistor) then replacing it should do the trick but this involves soldering which be done by an electronics technician or qualified to perform such repairs/replacement. Hope this helps. Cheers.

Posted on Apr 08, 2007

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The Sub-woofer provides nearly all the base for this particular setup.
On the back .......usually.......but somewhere will have an adjustment
knob or switch.......usually a knob......... turn it up a lil' bit, until you achieve your desired sound settings..........

Also, go into the volume meno of your desktop (windows desktop)
and adjust the settings well as any software your are using to listen to your media, since that will override the default/windows settings during playback.

I hope that helps.

Please Rate Me......Thank You!

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Can't adjust bass and treble

The only adjustments available on the unit are Volume and Bass (Subwoofer Level). There are no Mid-Bass or Treble adjustments.

Sep 20, 2009 | Jasco GE 98903 2.1 Speakers

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My subwoofer on my philips 5.1 speaker system is constantly generating lots of bass noise even on mute.

I assume you are using XP. Try these steps.
1. Open 'Sound and Audio devices' in Control Panel.
2. Select 'Advanced...' button near bottom. b2053f1.jpg

3. Select 5.1 system 972ed04.jpg

4. Start playing a sound.
5. Set the volume control of the subwoofer to the middle position.
6. Open volume control and adjust Master volume to a comfortable level (i.e. until there is no hum).
Also make sure you haven't muted any sound device except microphone. I think your problem is you have set it to the maximum level. So decrease it.
7. Mute the sound and check.
Good luck! Let us know the result.

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1 Answer

Adjusting the subwoofer volume seperately from speaker volume

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1 Answer

Noise from speakers when playing basses


Offhand, could either be the subwoofer speaker itself or the electronics (amp and/or crossover). One way to determine is by physcially checking the sub speaker. When playing with bass on, pls try restricting speaker movement by pressing on it and see if the noise is reduced. Another is to temporarily replace the speaker. You can try speakers meant for the car, home entertainment or book shelf, just dont set the volume too high.

If the speakers are ruled out, then it would be the electronics inside. For this, you would need familiairty with electronic components and circuittry, a DVM and a soldering iron. Access to an oscilloscope and an audio signal generator would be nice but not a necessity. The idea is to inject a constant audio signal and determine where the noise (if electronic) is coming from. In most instances, it would be a leaky electrolytic capacitor either in the input stage or feedback loop. At other times, it would be also a capacitor in the band pass filter.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

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