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JBL e140 cab

#21
Are you using a E-140 or K-140, you seem to have shifted drivers... the K-140 a little more limited.

2 x 3" diameter ports cut down to 3/4" is about as good as you are going to get. They can be anywhere between the thickness of the baffle and 2.5" and still be acceptable. Power handling will be limited to roughly 200 watts with a HPF, 150 watts without. With larger diameter ports, you will need longer ports to achieve the same tuning.

About the best compromise is an Fb of between 40Hz and 50Hz
 
#23
Ok, I missed that bit of detail. The K and E series drivers are close but not identical. In general, the K is a little more fragile than the E.

The EVM-15L would like to see 2 x 4" ports the thickness of the baffle (3/4"). Fb would be roughly 55Hz.
 
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#24
agedhorse said:
Ok, I missed that bit of detail. The K and E series drivers are close but not identical. In general, the K is a little more fragile than the K.

The EVM-15L would like to see 2 x 4" ports the thickness of the baffle (3/4"). Fb would be roughly 55Hz.
Click to expand...
How could I work the EV with a 3" hole?

"In general, the K is a little more fragile than the K."- ??, which one is the fragile one?

Plus, still confused on which way to go on the port size for either K or E

Thanks
 
#25
Pbman said:
How could I work the EV with a 3" hole?

"In general, the K is a little more fragile than the K."- ??, which one is the fragile one?

Plus, still confused on which way to go on the port size for either K or E

Thanks
Click to expand...
Sorry, the K is more fragile than the E

The EV is just ok with 3" ports, really helpful with 4" ports.

Both would work with 4" ports, the E/K-140 would probably do better with the port length being about 2.5"
 
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#27
E/K is ok with 2 x 3" port the thickness of the baffle.

The EVM-15L really benefits from 2 x 4" ports the thickness of the baffle
 
#31
ThisBass said: "To my taste 40Hz of tuning was way to low and, I woudn't suggest it for 3.2 cu.ft. of net volume."

I think I may have muddied up the discussion later in the thread, so I will yield to the experts regarding Pbman's project. But to continue with what I had said was my experiment - 3.2 cu ft cab, K140, 40Hz tuning, I see that 45Hz tuning might help me increase electrical and acoustic performance without threatening driver safety and low-end too much - at least on paper.
 
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#34
eddiemac said:
ThisBass said: "To my taste 40Hz of tuning was way to low and, I woudn't suggest it for 3.2 cu.ft. of net volume."

I think I may have muddied up the discussion later in the thread, so I will yield to the experts regarding Pbman's project. But to continue with what I had said was my experiment - 3.2 cu ft cab, K140, 40Hz tuning, I see that 45Hz tuning might help me increase electrical and acoustic performance without threatening driver safety and low-end too much - at least on paper.
Click to expand...
If a HPF protects the driver from sub harmonic content that occurs below cab tuning (and where the driver is unloaded) then the power handling at the lows would even benefit from a higher tuning (45..50Hz) cause it helps to keep cone excusion small in the bandwidth of 50..80Hz.

Rather than "threating low-end" the low-end would noticable benefit from a tuning in the range of 45..50Hz.

But, there is nor wrong nor right in this regard, some folks may prefer (soundwise) a rather (extremely) lowish tuning while others don't. Personally I prefer as much as "musical" performance possible for application MI bass guitar.

edit:
furthermore, a HPF also helps very effectively to protect a ported cab from unwanted chuffing artefacts.
 
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#38
Regarding my JBL K140 in a 3.2 cu ft cabinet: after trying many different cab tunings (with telescoping tubes), I ended up back where I started - 40Hz. I used a Sunn tube amp and a GK 200MB with the same tone and volume settings (maybe louder) I'd use at a gig and found the best sound and speaker control at 40Hz. My ears, for what it's worth.
 

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