Hertz?

stephensmia · Post by **stephensmia** » Sat Jan 28, 2006 2:28 pm

We'll what I should have said is that subs will play below what the box is tuned to but will be unstable so you should not do it. O well a ported box is nothing but some pipes huffing wind anyway.

Vindicate · Post by **Vindicate** » Sat Jan 28, 2006 2:41 pm

Alright, I'm gonna have to read this thread over a couple times more to catch all of that. Thanks for the quick responses all!

Another question. Is there anyway I can figure out what my subs are best tuned to other then by ear? Any formulas or anything I can punch info into? Here's what my Subs/Amps/Boxes are.

Amp: Kicker KX350.2
Subwoofers(2): Resonant Engineering RE12s
Sealed Boxes(2): 15"x15"x15" Boxes 1.424sq.ft - 0.14 Displacement of woofers = 1.284 sq.ft

The stat sheet for the Subs
http://www.reaudio.com/html/images/re_ts.gif

Jonathan · Post by **Jonathan** » Sat Jan 28, 2006 4:17 pm

"Another question. Is there anyway I can figure out what my subs are best tuned to other then by ear? Any formulas or anything I can punch info into? Here's what my Subs/Amps/Boxes are."

Get WinISD Pro. It's free and will give you a good idea of how your sub will perform in a given enclosure.

Post by **GlassWolf** » Sat Jan 28, 2006 5:35 pm

stephansmai; there's a good FAQ post on ported enclosures and how they function.
I suggest it be read.

Jonathan · Post by **Jonathan** » Sat Jan 28, 2006 8:11 pm

Typical myths about ported boxes:

1: Porting a speaker increases efficiency by allowing the back-wave generated by the driver to reinforce the front-wave.

2: Ported speakers have higher distortion than sealed enclosure speakers.

3: Ported speakers are more dynamic than sealed enclosure speakers.

4: The output of the port and woofer are out of phase with one another.

5: Ported speakers aren’t accurate as sealed enclosure speakers because ports (and passive radiators) are resonant device

Darthness · Post by **Darthness** » Sat Jan 28, 2006 8:55 pm

6: Drilling a hole in a box makes it ported

l.m.a.o

Mithrandir · Post by **Mithrandir** » Sat Jan 28, 2006 9:04 pm

not to hijack a thread but can having subs faced towards you instead of at the trunk totally eliminate a frequency because certain bass notes are like they arent even there, unless I open my trunk. My subs face the front of my car

JeremyC · Post by **JeremyC** » Sat Jan 28, 2006 9:37 pm

Mithrandir wrote:not to hijack a thread but can having subs faced towards you instead of at the trunk totally eliminate a frequency because certain bass notes are like they arent even there, unless I open my trunk. My subs face the front of my car

Thats called cancelation. With the subs firing forward some of the freq are bouncing of the back wall and then mixing with the sound waves comming of the front of the sub. The best way to stop it is to seal of the front of the box (subs) from the rest of the trunk.

You could also try some diffrent box positions and see what helps.

http://www.caraudiocentral.net/forums/s ... .php?t=233

stephensmia · Post by **stephensmia** » Sun Jan 29, 2006 7:15 am

[quote="KikiTheCat"]stephansmai]
You're right. It is good but I like sealed enclosures. I think they are so much better for SQ and thats what I'm into.

Post by **GlassWolf** » Sun Jan 29, 2006 8:23 am

no second and third order harmonic control with straight sealed. They get boomy as you go up in frequency.
If you want SQ, go aperiodic.