Please help a sub newbie out - AVS Forum
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post #1 of 12 Old 01-07-2007, 02:16 PM - Thread Starter
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What causes the woofer to flap and rattle when it plays super loud?

Is this bad for the speaker? Should I turn it down enough so it cannot EVER happen, or just low enough so it only happens when the bass gets VERY loud? Or does it not matter, and the flapping sound is just annoying? Please help. I cannot seem to find that answer to this ANYWHERE.

-Jason
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post #2 of 12 Old 01-07-2007, 02:20 PM
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If your sub is ported, chances are that sound is the driver unloading below tuning, or running out of excursion and bottoming. Not good for the sub, either way. What is the sub, by the way?

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post #3 of 12 Old 01-07-2007, 02:22 PM - Thread Starter
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Yeah, it's ported. Velodyne VRP1000

The reason I want to know is that I really can't turn this thing up very loud without this happening. I thought it was becuase my previous one was a defective open-box one, but I exchanged it for a brand-new one, and it is the same way.

BTW, this is a tiny room(bedroom). Only about 1000 cu ft. I figured this should be plenty, but now I don't know.

-Jason
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post #4 of 12 Old 01-07-2007, 02:26 PM
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Maybe you're cranking the sub way over it's potential, thus choking the sub. Turn that volume down a notch.
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post #5 of 12 Old 01-07-2007, 02:27 PM - Thread Starter
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Quote:
Originally Posted by ieatplasma View Post

Maybe you're cranking the sub way over it's potential, thus choking the sub. Turn that volume down a notch.

It's not that high. 0db(50%) on the reciever, 9 o'clock(25%) on the sub gain.

-Jason
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post #6 of 12 Old 01-07-2007, 02:28 PM
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Invest 40 bucks in a Radio Shack sound level meter. Most folks who have never calibrated their system have the sub waaaay too loud. If you've bottomed it repeatedly, it may very well be damaged.

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post #7 of 12 Old 01-07-2007, 06:17 PM
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Also, please check to make sure your "bass" is not cranked up. keep it at the 0 position. and if your reciever has a "bass boost" make sure it's not on!!
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post #8 of 12 Old 01-07-2007, 06:35 PM
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Quote:
Originally Posted by Eddie Horton View Post

Invest 40 bucks in a Radio Shack sound level meter. Most folks who have never calibrated their system have the sub waaaay too loud. If you've bottomed it repeatedly, it may very well be damaged.

I searched and couldn't find the answer.
Is there any reason to get the RadioShack sourced SPL meter over the similarly priced Galaxy CM130?

http://www.americanmusical.com/item--i-GAA-CM130.html

http://www.radioshack.com/product/in...entPage=family
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post #9 of 12 Old 01-07-2007, 06:58 PM
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Quote:
Originally Posted by unleashed View Post

I searched and couldn't find the answer.
Is there any reason to get the RadioShack sourced SPL meter over the similarly priced Galaxy CM130?

http://www.americanmusical.com/item--i-GAA-CM130.html

http://www.radioshack.com/product/in...entPage=family

The only problem I see with the CM130 is the frequency range with 125Hz at the low end. There isn't a posted FR for the RS, but I know it measures much lower than 125.

Randy
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post #10 of 12 Old 01-07-2007, 07:02 PM
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Thanks.
Will order the RS tomorrow.
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post #11 of 12 Old 01-07-2007, 08:49 PM - Thread Starter
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No, I just got the replacement today for the messed-up-on-many levels open-box one. It's only been bottomed out a few times. I've recalibrated so it won't happpen again.

I'll be getting an SPL meter in the near future. Just a question: Why do a lot of people say to get the analog one instead of the digital? The digital one seems more appealing to me.

-Jason
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post #12 of 12 Old 01-07-2007, 09:13 PM
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If you can still get the analog one, it is cheaper. Analog gages are easier to read in a dynamic measurement. Digital displays have a latency that makes them hard to read until they stabilize and it is easy to read a moving analog gage. From what I understand, the digital RS meter is more accurate below 20Hz than the analog is. I have the analog version.

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