Question about Boston Acoustics BA735 Computer Speakers

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Re: Boston digital BA735. Hum with or without input signal.

Re: Boston digital BA735. The sub and two speakers hum. The sub volume is full of static when turning. Could this knob also be causing the hum? Could the speakers have been damaged from hooking up the digital input cable into an analog out signal?

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  • Tom McDonald Oct 17, 2012

    find any solution? i have the same problem

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Hmmm I just got the same problem. They worked fine on my old Dell desktop but when I plugged them in to my son's old Dell PC (maybe 1 year newer than my old one) they all hum like crazy - as you say even if it's just the power plugged in and nothing else. Yes it does have the original power supply. I get no music (but still it hums) from digital out/in but when I switch to analog out/in I hear the music and it still hums, plus the sound is distorted. Wierd.

Posted on Jul 22, 2010

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Posted on Jan 02, 2017

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Then get out an ohmmeter and find that open circuitor or bad solder joint between RCA ground and real ground in the speaker's amplifier. Or.... if speaker ground kills the hum and you want to use RCA Line Level input to the sub, just connect one minus speaker output on your source amp to one minus on the sub's amp.

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I did have to change bios settings on one computer to use the on-board audio.

To enable digital output in XP, click on the speaker icon > Advanced > Select Enable SPDIF. You can leave the PC Spk Mute unchecked if you want the analog output as well. That's all.

I hope you are able to enjoy the rich sound of BA735. It's beautiful. My ears thank a lot for replacing those desktop speakers. BA735 hardly takes up any space . Two small speakers are perched on the hutch and the bass module is somewhere behind the desk, completely invisible.

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There is a standby indication that activates after 10-15 minutes without any input signal. I suspect that might be what the red light is telling you - no signal.

Loud hum from a loosened cable is normal as hum usually means there's an ungrounded connection somewhere acting as an antenna and the amp is doing its job to amplify what it thinks is a signal, in this case 60hz stray ac current is being sensed nearby. It's a good sign that you get hum from the sub because that means the amp is alive.

Avoid manipulating cable connections with the Sub or Receiver turned on as you could introduce a static spike that could harm any connected equipment.

Are you certain a bass signal is making it into the sub? The complexities of modern AV receivers vary in how you configure them to direct LFE to a sub. Bone up on that end of the chain.

Or, just hang a CD player on the Inputs of the sub and play something with a reassonable amount of Low Frequencies.

>>>> Be advised that this way of testing has NO VOLUME CONTROL because amps without volume controls always operate at maximum gain, relying on your external controls to attentuate it (hence, the loud hum from a loose cable); so choose a track that eases into the loud parts with some quiet parts up front and BE READY TO PAUSE THE PROGRAM AT ANY SIGNS OF STRESS. <<<<

A living sub will produce only muffled rumble in the absence of other speakers producing the higher frequencies which carry the intelligence of the signal. If that works, back to the receiver for settings. If not... sigh.

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For hum problems, even those you cause yourself:

Disconnect all inputs to see if that helps. If it goes away start with the signal cables and add in things until it comes back.

Sometimes the reversing the orientation of the AC plug can help with hum. Or it could be something like a loose or high resistance connection internal to the sub. Good luck.

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