tuning a vented box

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05colorado

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Joined: March 28, 2006

Location: Canada

Posted: April 04, 2006 at 4:00 AM / IP Logged

a box for 2 15's

is 35hz a suitable frequency

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DYohn

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Joined: April 22, 2003

Location: Arizona, United States

Posted: April 04, 2006 at 11:28 AM / IP Logged

The correct port frequency depends on the speakers you use. What are they?

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05colorado

Member - Posts: 19

Joined: March 28, 2006

Location: Canada

Posted: April 04, 2006 at 12:10 PM / IP Logged

rockford fosgate HX2 15's (RFD1215)

RF reccomends the tuning frequency be 35hz

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boardinbum

Silver - Posts: 358

Joined: February 07, 2005

Location: United States

Posted: April 04, 2006 at 12:42 PM / IP Logged

How big do you plan on making your box? You'll probably want to tune it lower for those subs.

DYohn

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Posted: April 04, 2006 at 12:42 PM / IP Logged

OK.... so if RF says 35 Hz, then that is probably good, huh? I believe they also recomend 2.5cuft per speaker, right? So do that and you will be right in line with the manufacturer's recommendations. That's why user's manuals exist.

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05colorado

Member - Posts: 19

Joined: March 28, 2006

Location: Canada

Posted: April 04, 2006 at 1:01 PM / IP Logged

DYohn wrote:

everytime i look at their info i always think: that dosent look right from air space to port size and length. ive even been asking their 1 on 1 tech question thing. i gave them my dimensions & they said with a box this size:

50"w x 17"h x 15"d (external dimensions) and 2 RFD1215 15's they reccomended 2 6" x 18"L port

thats to 35hz

i have the box cut out now, no ports are cut yet so i gotta figure this out

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DYohn

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Joined: April 22, 2003

Location: Arizona, United States

Posted: April 04, 2006 at 1:49 PM / IP Logged

Assuming you use 3/4" MDF and accounting for about .5cu ft driver displacement, I get 2X 6" round ports @ 18.25" long = 35Hz tuning. Why are you questioning the manufacturer? If that's what they say is correct, go for it.

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05colorado

Member - Posts: 19

Joined: March 28, 2006

Location: Canada

Posted: April 04, 2006 at 2:04 PM / IP Logged

DYohn wrote:

i dont mean 2 be a pain, i'm just paranoid. this is the 1st vented box ive ever built. i'm used to sealed enclosures

can i get 6" plumbing tube from home depot

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stevdart

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Joined: January 24, 2004

Location: Pennsylvania, United States

Posted: April 04, 2006 at 10:30 PM / IP Logged

Take the extra steps to be sure of yourself. Model it in a box-building program. Read my guide on using WinISD in the stickies.

Otherwise, you'll just remain in doubt.

Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

05colorado

Member - Posts: 19

Joined: March 28, 2006

Location: Canada

Posted: April 05, 2006 at 12:11 AM / IP Logged

i'm using bass box pro and it says the same thing, I just cant get over the 6" port size. is there an alternative?

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