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Help finding right cab volume for drivers.

W

whatisacup

Guest
Oct 20, 2012
103
0
#1
I'm trying to do my first DIY cab build with 4 drivers I have laying around.

When I look at Eminence specs, they give recommended volume.

These are the 4 drivers I have:

[Invalid or Expired Link Removed]

Can someone help with recommended volume? I'm thinking of building some kind of tall, somewhat vertical 4x10. :help:
 
#2
whatisacup said:
I'm trying to do my first DIY cab build with 4 drivers I have laying around.

When I look at Eminence specs, they give recommended volume.

These are the 4 drivers I have:

[Invalid or Expired Link Removed]

Can someone help with recommended volume? I'm thinking of building some kind of tall, somewhat vertical 4x10. :help:
Click to expand...

Sealed or ported? You might want to make two 2x10s.

Vas is a good starting point to estimate volume, then go from there - Start looking at around 1 cubic foot per driver. Model in WinISD. Modify from there.
 
#13
Woodstockz said:
Never said that it was a design goal. Just a ballpark number to get you into the ballpark and start plugging into WinISD, and modify volume from there. Do you have a better number to use as a starting point?
Click to expand...

Personally I thought your advice was pretty decent, what I don't understand is why it was easier for 1958Bassman to tell you how your statement was flawed yet offer no corrective information. Anyway thanks for attempting to help Whatisacup and have a great day.
 
#16
RS66LB said:
Personally I thought your advice was pretty decent, what I don't understand is why it was easier for 1958Bassman to tell you how your statement was flawed yet offer no corrective information. Anyway thanks for attempting to help Whatisacup and have a great day.
Click to expand...

I got a lot of help from reading talkbass, so I try to give back. Anyway, he probably didn't read my post closely before he answered.
 
#18
yah 1.25 is a large volume for this driver that would be almost a Extended bass shelf. You get more bass by putting the speaker in a larger volume and tuning below Fs of the driver.
but all that extra bass is 3db lower than the rest of the response so it looks like a shelf when you look at the response chart.

around .6 cubic and 60hz tune would be BB4 alignment. little lacking in bass.

60hz is little high resonant frequency would be nice to tune below it. but even going 5hz below it a response shelf starts to appear right away.

So I would stay with the BB4 tuning and stay right on the Fs of the driver at 60hz. going higher in the 65 to 70hz tuning is rather annoying for bass.

As far as volume adding a little more than .6 would give a little extra bass at around .8 then just tune to 60hz.

.8 is really close to 1 cubic if you did just tune slightly higher to about 63/64 hz.

its really a compromise trying to increase volume as much as possible before a major shelf starts to appear. likewise with the tuning its already a high resonant frequency so dont wanna "flatten" the response by tuning to high or create a huge shelf by tuning to low. so instead of having a huge 3dB shelf, only have a slight 1dB shelf. but the tune is pretty much set 60hz is already high. Could also tune lower to 55hz but then lower the volume back to .6 cubic to tame down the shelf a bit. confused yet?

so easy

.8 at 60hz
1cubic at 64hz
.6 at 55hz
 

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