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JBL 2226 for bass

#41
I've designed commercial products with these speakers, I very much know EXACTLY what I am talking about.

The 30Hz spec that is published by JBL is for a 10 cubic foot box and is the F10 value (not the F3 value) for a mildly overdamped response. This is a huge box, larger than any commercial bass guitar cabinet that I am aware of by a wide margin. Unless your box is this big and tuned this way, the F10 response will not be 30Hz. Modern drivers (including JBL's) are typically no longer designed this way because 10 cubic feet (internal) for a single cabinet is way larger than bass players (or pro audio guys) are willing to carry for that kind of performance.

A 10 cubic foot internal box would be about 12 cubic feet external, accounting for wood thickness and grille recessing, that would be a box 2' x 2' x 3' (which is HUGE). Your cabinet is 1/2 that size, therefore the response will be very close to what I predicted (presuming your porting is optimum for that driver, which it may not be).

This is why facts are important, understanding them keeps people from making ridiculous claims of performance that aren't possible.

For others who are following along, this is how engineers keep things real and why the math is important when designing speakers and making claims of performance.
 
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#43
david B pruitt said:
might not be acceptable, a volkswagon might not be acceptable to a cadillac lover either, whos talking about acceptable. What do you play thru? Have you played thru one? why am I getting this. Maybe others will appreciate what I'm saying
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You really have no clue who you are arguing with.

Your box might make some noise down around 30Hz, and it might even be reasonably loud, depending how you have it equalized, but I doubt it will last very long trying to use it outside of it's useful bandwidth.
 
#44
David if the 2226 sounds OK to you in your cabinet just go and play through it and be happy. If it pleases you then that is the bottom line. You are arguing with a gentleman who designs amplifiers and speaker cabinets for a living. You can take what he says to the bank!

Now Andy just for interest how does the 2225 stack up? I have a couple. :)
 
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#45
BassmanPaul said:
David if the 2226 sounds OK to you in your cabinet just go and play through it and be happy. If it pleases you then that is the bottom line. You are arguing with a gentleman who designs amplifiers and speaker cabinets for a living. You can take what he says to the bank!

Now Andy just for interest how does the 2225 stack up? I have a couple. :)
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The 2225 is pretty similar, the mechanical Q is different so the tuning will end up a little different but for the most mart they are reasonably interchangeable. There are also some differences in power handling and such.
 
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#51
For example, an ampeg sealed 810, which is arguably one of the best sounding bass cabs ever made, doesn't really produce much sound below 70 Hz.

Then, you ask, why does the open low E (42 Hz) sound so great? Harmonic overtones!

What you're hearing when you think you hear 30 Hz is the first overtone, at or around 60 Hz, and the second overtone at or around 120 Hz.

There really are very few drivers that can produce meaningful output at 30 Hz.

Popular headphones like the Beats brand and even the iphone buds are optimized around this principle and they are carefully tuned to emphasize those bass frequencies, which gives you that pleasing warmth.
 
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#52
Doufuss said:
For example, an ampeg sealed 810, which is arguably one of the best sounding bass cabs ever made, doesn't really produce much sound below 70 Hz.

Then, you ask, why does the open low E (42 Hz) sound so great? Harmonic overtones!

What you're hearing when you think you hear 30 Hz is the first overtone, at or around 60 Hz, and the second overtone at or around 120 Hz.

There really are very few drivers that can produce meaningful output at 30 Hz.

Popular headphones like the Beats brand and even the iphone buds are optimized around this principle and they are carefully tuned to emphasize those bass frequencies, which gives you that pleasing warmth.
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I don't believe that
 
#57
david B pruitt said:
thanks, everybody is telling me the speaker won't go down to this and that and thats not what JBL says
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JBL never said you can get any useable response at 30hz. Between what you think you hear and what you think they meant you are deluded.

Play a 60hz sine. Don't play it too loud because it might blow your cab, just loud enough to hear it. Measure the voltage it's getting.

Then play a 30hz sine at the same output voltage. You will see the cone moving but that's about all. If you turn it up ( not advisable as it could well break your driver ) to audible, the sound you hear is distortion not 30hz.
 
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