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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  • Anonymous Jan 07, 2009

    When I adjust my volume on the woofer, the woofer only works when I have the volume turned 90% of the way on. Then there is no adjustment. I use to really enjoy the sounds of this set up.

  • Anonymous Mar 18, 2009

    Same exact problem here...

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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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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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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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1 Answer

What volume level should I set the sub at please. I have a Marantz 7005 av amp and when using Audyssey to set up, the slam from the sub is miniscule. I normally set it a 50% volume when setting up,can...


It might be easier to "skip" the subwoofer meausrement step in Audessy and tune it by ear instead. Refer to page 52 in the manual, step 6/7.

I use familiar music and test tones when I tune my sub to the mains. Generally, I set the preamp trim to -10db, the crossover as appropriate (80 or below), and then bring up the level knob on the sub to taste. Confirm phase alignment, if possible, by having someone flip the phase (if available) so the response is strongest at the main listening position.

Keep it a little "lean" at first, and over the next several hours or days, bring the preamp level up one db at a time. It takes several days of tweaking to arrive at a level that I find appropriate. Once there, I try to ignore programs with bloated bass - remember, not all recordings are created equal.

Should you fond yourself bringing the preamp level to 0 or above, kick the sub amp level knob up a couple of clicks, and back off the preamp level. It's safer to have the amp do the work, than driving too hot of a signal at the preamp level and clipping it.

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Tip

Tip for your home theater system: tweak your subwoofer level and crossover...


An important tip regarding your home theater system is to Tweak subwoofer-level and crossover controls:
Test tones and meters aren't the final arbiters in the bass department. If your sub's bass is boomy, thick, or uneven, first try lowering its volume --most people complain that their sub louder than necessary. Next, if your satellites are very small, the crossover control should also be set to its midpoint or higher. Bigger speakers produce more bass on their own, so they sound best with the sub's crossover knob set at or near the bottom of its range. Finally, moving the sub out of the corner and closer to one of the front speakers may produce smoother, flatter bass.

on Aug 23, 2010 | Audio Players & Recorders

1 Answer

Subwoofer not getting max bass


try using a ohm meter and if its not making what the factory specs are its most likly it will keep loosing more and more power then stop working which is what ive had happen to me before

Mar 11, 2010 | Fusion RE-PK2120 900W Bass Pack: Amplifier...

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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).
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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.






Jul 07, 2009 | Audio Players & Recorders

1 Answer

Too much bass...low end


Hi, have you tried adjusting the "subwoofer level", and or the "subwoofer cut" controls? Every sub I have ever seen has at least the level control on the back. The "cut or crossover" control determines the frequency at which the sub will start to respond. Additionally, you may need to access the appropriate menu on you reciever and adjust the "low frequency effects" (LFE) output level (assuming you have connected your sub to the reciever's sub output jack.

Hope this helps.

Jun 16, 2009 | Wharfedale SW150 Subwoofer

2 Answers

Can I use front preouts for subwoofer?


First, you have to have a self-powered subwoofer (or two) with this reciver. That means the sub has its own amplifier. These are usually capable of accepting either Line Level (RCA) input or direct L and R amplifier channel speaker wires from your receiver from which it will react only to frequencies in its range. It doesn't actually use any if the power from your receiver's amp.

That is why you can extend your front speakers from the sub. Again, understand this - it is not playing any part in amplifying them. The amps in your receiver are just passing through it.

Setting your speaker 'Type' definition to Large will tell your receiver that they are capable of real bass (as opposed to small satellites) but won't necessarily steal anything from the subs. Set your LFE/Bass Out setting to Both if your front speakers are capable of handling real bass. Why would you want to deny them bass if they can handle it?

This part is confusing "If I can get the sub working on taking the lows out of the front speakers if I set them to large on the receiver then that is one thing less to send to the other sub on the LFE channel". The crossover feature allows you to define what bass goes to the sub. You would use the various points to smooth out the transition between your sub and the rest. Your quote of 47hz spec for something doesn't suggest your other speakers are great bass reproducers. One needs to see the +- db spec with less than x% distortion for that number make any sense.

Your receiver has two RCA Subwoofer Outputs but I'm sure they get the exact same level. If you're having trouble matching two different subs doesn't at least one of them have an adjustment for volume? Or maybe you could use physical positioning to adjust their comparative volume.

May 08, 2009 | Yamaha RX-V663 Receiver

1 Answer

Powered Subwoofer hits hard even on dialogue.


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Apr 23, 2009 | KLH ASW10-120 Subwoofer

2 Answers

Very low ouput from subwoofer preout


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2 Answers

Subwoofer volume and sound


i had the same problem when i tried to adjust speaker output levels, distance and equalizer manually without using audessy setup..so i reset everything to factory setting (0s)..and then ran 
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1 Answer

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Hope this helps.

Jan 14, 2007 | KLH HTA-4100 System

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