How loud is 80dB?? - Home Theater Forum and Systems - HomeTheaterShack.com

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post #1 of 15 Old 08-07-06, 04:53 AM Thread Starter
Shackster
surrey lad
 
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How loud is 80dB??

Hi guys..

I spent some time on Saturday setting up REW/BFD and my servo-15 sub (not quite there yet!) and I'm quite surprised at how low, let's say 60Hz sounds when set to 80dB reading off my spl meter.

When running the frequency sweeps I was half expecting to shack and rattle the room annoying the neighbours and wife but instead all I hear is a very subtle sweeping sound.

Is this right

BTW great forums guys. I haven't posted many but read loads!!
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post #2 of 15 Old 08-07-06, 05:37 AM
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Re: How loud is 80dB??

I think this is normal, my mower puts out 75Db (by the label on it), if you really want to shake your room turn it up to around 110-120Db. Maybe some of the other guys can tell you more. welcome to the shack
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post #3 of 15 Old 08-07-06, 06:35 AM
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Re: How loud is 80dB??

With respect Danny, if you turn a sub up to between 110-120dB you can probably say bye-bye to your sub.

Subs are very few and far between which can tolerate such levels even for the brief period of a test sweep. 120dB @ 10Hz (at the start of the REW sweep) is probably beyond the ability of almost all commercial subs available anywhere.
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post #4 of 15 Old 08-07-06, 07:48 AM Thread Starter
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Re: How loud is 80dB??

Hi guys,

Thanks for the quick replies. You have a point about your mower. I was cutting the grass with my new petrol mower yesterday (also displaying a 75dB warning label) , I took off my ear defenders to find that, 75db from a mower is pretty tame and bordering not requiring ear protection.

At one stage I did think that maybe the spl meter was faulty, so I used the auto setup procedure with mic that comes as standard on my EAD processor to self generate its own pink noise and allow it to set it's self to 75dB. Checked the RS meter and yes it read 75db, but strangely enough pink noise at 75 is loud.

Maybe I've answered my own question by comparing the calibration of the EAD with the RS meter, it just seemed surprisingly quiet to me.
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post #5 of 15 Old 08-12-06, 08:35 AM
josh
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Re: How loud is 80dB??

hey Surreylad

Is that Surrey B.C.?

Believe me, the servo 15 will play any frequency to levels that will literally shake you walls and windows and with its built in overload protection, you don't have to worry about hurting it, I've had mine for 9 years and its well used, only shut down on me once and upon inspection, i found a towel had fallen down over the heatsinks, so it overheated, waited 10 minutes, removed towel and off it went.

The only sub I've ever tried that even came close was the Velodyne 18", but the servo 15 had a more pleasing sub 20 hz rumble to my ears.

The Velodyne is rated to 10 hz and the servo is rated at 115 db to 14 hz, but the Velodyne put out substantially less volume on my meter with a warble tone of 15 hz than the servo 15

The servo 15 rocks
post #6 of 15 Old 08-14-06, 03:53 AM
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Re: How loud is 80dB??

josh, maybe you hear harmonics of 15hz and than you thing its louder than velodyne
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post #7 of 15 Old 08-14-06, 05:52 AM Thread Starter
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Re: How loud is 80dB??

Quote:
josh wrote: View Post
hey Surreylad

Is that Surrey B.C.?


The servo 15 rocks
Hi josh, its actually Surrey, UK, way way over the other side of the pond! i've just added the googlearth feature.

Over here the servo 15 has a bit of a cult following. I can't ever see myself having to upgrade unless something goes horribly wrong.

I used to drive a pair of REL Stratas, I couldn't believe the difference when I changed to the servo, within a minute of testing I had a BIG grin on my face,WOW.

Have you set up your servo using REW?
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post #8 of 15 Old 08-14-06, 04:26 PM
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Re: How loud is 80dB??

Quote:
josh wrote: View Post

The only sub I've ever tried that even came close was the Velodyne 18", but the servo 15 had a more pleasing sub 20 hz rumble to my ears.

The Velodyne is rated to 10 hz and the servo is rated at 115 db to 14 hz, but the Velodyne put out substantially less volume on my meter with a warble tone of 15 hz than the servo 15

The servo 15 rocks
It is interesting that you claim to have actually heard frequencies below 20Hz. The RS meter can't differentiate harmonic distortion from fundamentals. It measures the first far more readily than the latter and does so by a very large margin.

Anything much below 25Hz on a low distortion subwoofer is the softest of animal purrs to my ears without any audible clues as to tonal quality or timbre. (No matter what the level)

To describe it as a "rumble" is certainly not the term I would use. I believe you are actually hearing the harmonic distortion components of the fundamental or local sympathetic vibrations.

These very low frequencies tend to modulate higher tones giving them a sort of tremolo or vibrato effect. While the fundamental remains completely inaudible to human hearing. The same can't be said for whales and elephants.
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post #9 of 15 Old 08-16-06, 06:55 AM
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Re: How loud is 80dB??

I've played around with some sinewaves on my DD15, and I found exactly what Chrisbee said.

10Hz was completely inaudible but had a few windows were rattling.
15Hz I could feel pressure in my ears but no sound, except that the entire room including the substructure of the house was vibrating

cheers

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post #10 of 15 Old 08-16-06, 06:59 AM Thread Starter
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Re: How loud is 80dB??

Quote:
MACCA350 wrote: View Post
I've played around with some sinewaves on my DD15, and I found exactly what Chrisbee said.

10Hz was completely inaudible but had a few windows were rattling.
15Hz I could feel pressure in my ears but no sound, except that the entire room including the substructure of the house was vibrating

cheers
What sort of dB levels was you playing at??
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