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Old 8th November 2010, 01:31 PM   #1
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Default bass freq

Is 40 hz the best bass freq to play outdoor in open area? If so, why is that.
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Old 8th November 2010, 01:42 PM   #2
AndrewT is online now AndrewT  Scotland
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are you building a FogHorn?

What is your intended purpose?

To replay recorded music?
To amplify live music?
To amplify electronic sounds?

To a big audience?
To a few friends?
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Old 8th November 2010, 02:07 PM   #3
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The bottom note on a 4-string electric bass is 41 Hz, and that kick in the gut that drums provide is 50-80 Hz. Many speaker builders
advertise 30 or 40 Hz, but it's often down -10 dB or more.

Low frequency - Small box - Loud Sound ... pick two!
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Old 8th November 2010, 03:17 PM   #4
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Quote:
Originally Posted by AndrewT View Post
are you building a FogHorn?

What is your intended purpose?

To replay recorded music?
To amplify live music?
To amplify electronic sounds?

To a big audience?
To a few friends?
I am talking folded or tapped horn to replay recorded music for audience of 200 or more
Low and loud
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Old 8th November 2010, 03:37 PM   #5
AndrewT is online now AndrewT  Scotland
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a stack of 6 Labhorns (folded horn) sitting on the ground will do that.
Check the specifications to see what you need to try to compete with.
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Old 9th November 2010, 01:23 AM   #6
djk is offline djk
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Bass is a cube function.

If you keep the efficiency the same, going one octave deeper will require eight times the volume.

Going from 50hz to 40hz is 2x, from 40hz to 32hz another 2x, from 32hz to 25hz another 2x, for a total of 8x (2^3) from 50hz to 25hz.

I built my stack for 31hz, but sometimes I have to ask myself if being 2x as large for the few times the low B (31hz) shows up in the program material is really worth it.
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Old 9th November 2010, 02:09 AM   #7
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Quote:
Originally Posted by djk View Post
Bass is a cube function.

If you keep the efficiency the same, going one octave deeper will require eight times the volume.

Going from 50hz to 40hz is 2x, from 40hz to 32hz another 2x, from 32hz to 25hz another 2x, for a total of 8x (2^3) from 50hz to 25hz.

I built my stack for 31hz, but sometimes I have to ask myself if being 2x as large for the few times the low B (31hz) shows up in the program material is really worth it.
SO if a song is recorded at 50hz can it be play back at 30hz if your bass bin can go that low
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Old 9th November 2010, 10:14 AM   #8
djk is offline djk
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No, if the song is recorded at 50hz, it plays back at 50hz.

The peak output in dance music is at about 55hz, but many pieces of music have strong content to 40hz.

In the last three years I have only heard one song that went below 40hz that was played at college dances. You couldn't really 'hear' it, it just shook your pants leg and made the air in the room 'judder'. It took eight long-excursion 15s with about 3KW to do it.

Click the image to open in full size.

Low end powered by Crest V1500s, one for each side of the stage (750W x 4).

Click the image to open in full size.

This design is -3dB at 29hz, and one box with its two 15s plays 128dB with 600W in. A second box would add 6dB, and the two on the other side of the stage add another 6dB at very low frequencies.

On one song I saw a peak of 122dBC at a distance of about twenty foot, this calculates back to about 138dB at one meter, about the theoretical peak for this system.
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