Woofers No Longer Produce Bass Like Before - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 9 Old 07-14-2015, 06:49 PM - Thread Starter
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Woofers No Longer Produce Bass Like Before

Hey Everyone!

I recently acquired some used Boston Acoustics A70s. When I got them, they struggled to play anything below 100Hz. The foam around the drivers was all but completely missing, so I replaced it. After the adhesive had dried, I tested the speakers, and they were producing frequencies as low as 50Hz just as loud as those in the midrange. Over the next two days, I didn't use them much.

Last night I listened at a moderate volume for no more than an hour, and they still sounded great. This morning I noticed a significant lack of bass, so I tested them. Starting at 130Hz, there is a consistent drop in volume until the notes are too low to be reproduced audibly by the speakers (50Hz is about 30dB less than 130Hz).

I checked the foam that I had replaced, and everything looks intact and secure. I can't hear anything wrong with the tones between 50Hz and 130Hz; they're just very quiet. Nothing has changed in the setup between last night and this morning.

Any suggestions?
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post #2 of 9 Old 07-14-2015, 08:53 PM
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Using an AVR?

Speakers got set to 'small' somehow?

I'll be back later...


System links::: 1.5RQ > digits from all sources > 1177a > OpenDRC-DI with AcourateDRC > DEQ2496 > DAC2 > KCT > FPB 350mcx > reQuest + Cheezewoofer Wattless Deluxe > Sweetspot
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post #3 of 9 Old 07-17-2015, 02:01 AM - Thread Starter
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Ray, that's a very good suggestion. However, the receiver doesn't even have that option. It's just 2.0. There might be some setting in the receiver that I'm unable to find, but the manual doesn't mention anything related to frequencies, other than the option to turn bass up/down (which hasn't changed).
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post #4 of 9 Old 07-17-2015, 07:47 AM
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Swap the speakers with another pair of speakers and hear if your bass has returned.

If not, it's the AVR....if you have bass, then there is another problem with the Bostons.
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post #5 of 9 Old 07-17-2015, 12:37 PM
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Did you leave enough time for the glue to completely dry?

Press around the edge, maybe the surround has come loose.

Steve/bluewizard
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post #6 of 9 Old 07-18-2015, 08:41 AM - Thread Starter
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Quote:
Originally Posted by 18Hurts View Post
Swap the speakers with another pair of speakers and hear if your bass has returned.

If not, it's the AVR....if you have bass, then there is another problem with the Bostons.
Unfortunately, I don't have another pair of speakers like this that I could test with.

It might be useful to add that both speakers changed over the same night, and they both are lacking in the same frequencies.
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post #7 of 9 Old 07-18-2015, 08:42 AM - Thread Starter
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Quote:
Originally Posted by bluewizard View Post
Did you leave enough time for the glue to completely dry?

Press around the edge, maybe the surround has come loose.

Steve/bluewizard
That was my thought as well, but I let it dry overnight, and it feels completely solid to me.
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post #8 of 9 Old 07-23-2015, 08:53 PM - Thread Starter
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FYI, I believe I figured out the issue. It's my room. The acoustics are so terrible, that at certain points throughout the room (such as where my head is located during testing and normal listening), the bass is reduced to insignificant levels. I was able to rectify this somewhat by placing the speakers on the floor.

This still doesn't explain why it sounded great one night, and then the next morning it didn't, but I'm ok with it, as long as I've got the bass I was missing.

Thank you all for your help!
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post #9 of 9 Old 07-24-2015, 06:31 AM
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Consider adding a subwoofer to your system.
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bass , frequency range , frequency response , low end , volume

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