In Bass reflex box (vented)-If I make smaller box than what consequences will I have?

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AndrewT

R.I.P.
Joined 2004
download WINisd pro.
try different volumes and different vent lengths.
You will find that too small a box creates a "hump" in the frequency response. Great if you are using a driver/box that has a very high F3 and you want to create a bass effect by exaggerating the 2nd harmonic. This is very intolerant of room variations and can sound bad on male voice.

A slightly drooping response avoids the bass exaggeration and helps reduce that male voice sensitivity. It is easier to place in the room.

A true "Butterworth" rolloff (Q=1/sqrt(2)) looks nice, but in a room it falls between the two examples above.
 
S

sreten

R.I.P.
Joined 2003
Hi,

That driver is intended for sealed boxes not vented, ~13L stuffed.

But 30L tuned to 33Hz looks good to me, but a big box for a 6.5".
Good bass but limited bass power handing, well suited to valves.

Other options may work better, 30L can take 2 vented 6.5"ers.

rgds, sreten.
 
E

eliaselias_0

Member
Joined 2009
AndrewT said:
download WINisd pro.
try different volumes and different vent lengths.
You will find that too small a box creates a "hump" in the frequency response. Great if you are using a driver/box that has a very high F3 and you want to create a bass effect by exaggerating the 2nd harmonic. This is very intolerant of room variations and can sound bad on male voice.

A slightly drooping response avoids the bass exaggeration and helps reduce that male voice sensitivity. It is easier to place in the room.

A true "Butterworth" rolloff (Q=1/sqrt(2)) looks nice, but in a room it falls between the two examples above.
Click to expand...

Thank you for WINisd pro.
Very usefull program.
 
S

sreten

R.I.P.
Joined 2003
eliaselias_0 said:
I am thinking to use it in a 3-way as woofer 33Hz to 250Hz.
Is it possible this?
Click to expand...

Hi, its certainly possible, but it is designed for sealed 2 ways, rgds, sreten.

3 ways are very difficult to design - check out these sites/designs.

Use WinISDPro to model bass max SPL and max bass power handling.

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Zaph|Audio
FRD Consortium tools guide
RJB Audio Projects
Speaker Design Works
HTGuide Forum - A Guide to HTguide.com Completed Speaker Designs.
Humble Homemade Hifi
DIY Loudspeaker Projects Troels Gravesen
 
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eliaselias_0

Member
Joined 2009
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