64hz does not equal 256!?

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Topic: 64hz does not equal 256!?

[This message has been edited by predatorsound (edited 04-24-2001).]

predatorsound
New Member
Member # 659

posted

recently I designed a box using bassbox pro 6.0 for 2 15w3d2's tuned to 64hz. upon testing the box we got ton's of output, at 256hz! I then completely redid the design and ended up with the exact same port. Just to be sure it wasn't my fault I entered the old port we had for the enclosure( which played @ 56hz) and the program gave perfect results! then I tried another port tuned @ 70
and got a wrong port size. After around 58hz the program doesnt work with my design.It shows it peaks @ one frequency but actualy peaks at another! And it usually seemed to be about 4 times higher. What am i missing?
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[This message has been edited by predatorsound (edited 04-24-2001).]

Posts: 9 | From: vitoria,b.c,canada | Registered: Nov 1999 | IP: Logged |

Colin------------------
Spy Shots
Warning SPL in my car exceeds government health guidelines, civilians are advised to proceed with caution.
Failiure to comply may result in serious injury or death.1 Shocker extreme :)

Mouser
Senior Member
Member # 3180

posted

I'm familiar with the software, but I don;t understand exactly what you mean.
Are you saying that it gave the wrong port length, or that it said it would peak at one frequency but it peaked somewhere completely different?

Colin

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Spy Shots
Warning SPL in my car exceeds government health guidelines, civilians are advised to proceed with caution.
Failiure to comply may result in serious injury or death.

1 Shocker extreme :)

Posts: 2999 | From: England | Registered: Oct 2000 | IP: Logged |

ShadowStar------------------
Still looking for that CHEAP Thunderdome :D Got Ears? Get Oz! You can't build a reputation for what you're GOING to do.. But you can build one for TALKING about it! -Eclipse-Rockford Fosgate-Oz Audio-Precision Power Inc.-AudioControl-Stinger-Tsunami-Clifford

It's all about knowledge, love and respect.

ShadowStar
Moderator
Member # 78

posted

How did the box response work? Did it peak near the 64 hz AND at 256? That could have just been some other interaction.

ShadowStar

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Still looking for that CHEAP Thunderdome :D

Got Ears? Get Oz!

You can't build a reputation for what you're GOING to do.. But you can build one for TALKING about it!

-Eclipse-Rockford Fosgate-Oz Audio-Precision Power Inc.-AudioControl-Stinger-Tsunami-Clifford

It's all about knowledge, love and respect.

Posts: 2578 | From: Somewhere In the Northeast | Registered: May 1999 | IP: Logged |

Skipper------------------

skipper
New Member
Member # 4342

posted

Sounds like this is peaking at two octaves higher than what you want. I have heard that some copy protection in some programs might give you worse and worse port lengths the longer you use it. Maybe you are using a bootleg version of this program? Or maybe I don't want to know LOL.

Skipper

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Posts: 29 | From: Toronto,Ontario,Canada | Registered: Mar 2001 | IP: Logged |

minimike!
Senior Member
Member # 3400

posted

When you say "testing" do you mean in car or when Bass Box plots it on the graph?

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Posts: 515 | From: Omaha NE, USA | Registered: Nov 2000 | IP: Logged |

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2-DD 9512's
2-2000X's (for now)
8.0ft^3 box in a civic trunk
One big ass port
?????dB's
It's not the size of your woofer,
It's the size of the waves your woofer makes!

Mr.Dank
Senior Member
Member # 584

posted

You might want to post your dimensions and stuff on here. Its possible that you moght have entered in the wrong umm, umm, I cant think of the word. UNITS, thats what I was thinking. maybe you did feet instead of inches or meters or centimeters??????????

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2-DD 9512's
2-2000X's (for now)
8.0ft^3 box in a civic trunk
One big ass port
?????dB's

It's not the size of your woofer,
It's the size of the waves your woofer makes!

Posts: 1259 | From: Fullerton. CA ,USA | Registered: Oct 1999 | IP: Logged |

and i am interested to test your desing on my program copy if you post the parameter that you are using. Does some of Bassbox pro user already desing a sub and compared the real response with RTA ans spl meter and the data calculated by the program? what was the difference between the two curve and SPL ?
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Show me the bass !

Doctorbass
Senior Member
Member # 1357

posted

I am using bassbox pro 6 too,

and i am interested to test your desing on my program copy if you post the parameter that you are using.

Does some of Bassbox pro user already desing a sub and compared the real response with RTA ans spl meter and the data calculated by the program? what was the difference between the two curve and SPL ?

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Show me the bass !

Posts: 643 | From: Quebec city | Registered: Mar 2000 | IP: Logged |

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