AudioKinesis Cabs Part VI...

[Kirk Bryant]

My non pharma, no sleep solution is Melatonin. Since I spend so many nights up til the wee hours, when I have to go to bed and get up early, I take couple of the melatonin pills and sleep like a baby without any hangover. I've resorted to other things but this is now my go to.

 

[kittywithabanjo]

I have sleep apnea.. So use the whole mask type rig really helped me out.

 

[allenhumble]

Medicinal flowers help me sleep....

 

[Lowendtech]

I sleep way better since I kicked the TV out of the bedroom. (The blue hue tricks your body into thinking it’s morning and time to wake up) Now I read a book (e-reader with the screen set to black) when I go to bed. I’m usually out after a couple of pages. I need something to help me forget about all the random thoughts bouncing around in my melon. Reading novels seems to help.

 

[DukeLeJeune]

Thank you guys so much for your concern!

I probably should have been a bit less cryptic... the lack of sleep is a side-effect of abdominal pains. I'm now working my way through the health care system and my next step is get cat scans and see a specialist. Okay enough of that crap!

I have read thru this thread and understand that the 1203 type cab uses the Eminence 3012LF.. That is a potent driver.
In theory I think that a Pair of the 1203T cabs can and will exceed the output of almost ALL 410 type cabs, by a fairly large margin!

Not sure I'd claim a pair of 1203T's would be louder than ALL 410 cabs, but the pair would probably be competitive with most 410 cabs in loudness, while probably going a bit deeper, and probably requiring a bit more wattage along the way.

My current 3015 style 2 way cab has about 505 cm^3 of displacement.
I guess the cm^3 is NOT the only thing to consider in cab design.. I am NOT an expert.. Im a bass player, that can fiddle with some simple math.. So i may be completely wrong with my calculations below...

SOMETHING is going to be the limiting factor, and it's probably not going to be displacement in any of my 112 or 212 cabs unless they are getting a signal with a lot of energy down very low. But my 112 and 212 cabs are not highly efficient, so if their more efficient competition isn't driven into fartout, it will go louder (assuming good thermal power handling).

You mentioned the 3015's 505 cm^3 of displacement, that's probably in the same ballpark as the custom 15" woofer in my current crop of 115 cabs. In practice, they will go as loud as my 212s, despite having significantly less displacement "on paper", which makes me think that my 112s and 212s really aren't getting anywhere near their excursion limits. I think the woofer in my 115 goes non-linear due to the suspension system before the voice coil actually starts to get beyond the linear range of the motor system, and I think that results in a more "gentle" exceeding of x-max, but I'm not sure. I've never had the Klippel analysis done on that woofer to answer the question. The voice coil in my custom 15" Kappalite-variant is a little bit longer than the one in the stock 3015 (non-LF), and mine has the bumped backplate like the LF version, so x-damage is probably higher even if my x-max (linear excursion) isn't.

I have been doing some Math.. PLEASE feel free to correct me if i am wrong... I am NOT an expert with this.

Eminence 3012LF
• Xmax peak = 9.10 mm
• Sd = 545.4 cm^2
Volume Displacement -Vd = 545.4 x 0.910mm = 496.3 cm^3

But when TWO 1203T's are used together , that would be about 992 cm^3 !
That's a pile of AIR if i calculated correctly..
So it seems these cabs can deliver some decent low end while having articulation too.!.

Your math looks good to me!

Having plenty excursion headroom is a good thing from an articulation standpoint so that woofer is still fully powered at the extremes of its excursion, rather than having those peaks rounded a bit. Ime it also helps to not have too big of a box, nor too high of a tuning. The greater the contribution from the port itself, in general the poorer the articulation. I try to make my vented boxes no bigger than necessary to meet my targets, most obviously in the interest of portability, but also in the interest of articulation. The port plugs can also help with articulation.

 

[svtb15]

YOu are VERY helpful.
And for a guy like me that really knows ZERO about this stuff,you make it very easy to understand and you are down to earth.. . I THANK YOU!
Some of the so called "Gurus" on TB act as elitist snobs that speak in code to elevate themselves. You speak english
I thank you for being HELPFUL and to the point ..

Thank you guys so much for your concern!

I probably should have been a bit less cryptic... the lack of sleep is a side-effect of abdominal pains. I'm now working my way through the health care system and my next step is get cat scans and see a specialist. Okay enough of that crap!



Not sure I'd claim a pair of 1203T's would be louder than ALL 410 cabs, but the pair would probably be competitive with with most 410 cabs in loudness, while probably going a bit deeper, and probably requiring a bit more wattage along the way.



SOMETHING is going to be the limiting factor, and it's probably not going to be displacement in any of my 112 or 212 cabs unless they are getting a signal with a lot of energy down very low. But my 112 and 212 cabs are not highly efficient, so if their more efficient competition isn't driven into fartout, it will go louder (assuming good thermal power handling).

You mentioned the 3015's 505 cm^3 of displacement, that's probably in the same ballpark as the custom 15" woofer in my current crop of 115 cabs. In practice, they will go as loud as my 212s, despite having significantly less displacement "on paper", which makes me think that my 112s and 212s really aren't getting anywhere near their excursion limits. I think the woofer in my 115 go non-linear due to the suspension system before the voice coil actually starts to get beyond the linear range of the motor system, and I think that results in a more "gentle" exceeding of x-max, but I'm not sure. I've never had the Klippel analysis done on that woofer to answer the question. The voice coil in my custom 15" Kappalite-variant is a little bit longer than the one in the stock 3015 (non-LF), and mine has the bumped backplate like the LF version, so x-damage is probably higher even if my x-max (linear excursion) isn't.



Your math looks good to me!

Having plenty excursion headroom is a good thing from an articulation standpoint so that woofer is still fully powered at the extremes of its excursion, rather than having those peaks rounded a bit. Ime it also helps to not have too big of a box, nor too high of a tuning. The greater the contribution from the port itself, in general the poorer the articulation. I try to make my vented boxes no bigger than necessary t0 meet my targets, most obviously in the interest of portability, but also in the interest of articulation.

 

[Lowendtech]

I probably should have been a bit less cryptic... the lack of sleep is a side-effect of abdominal pains. I'm now working my way through the health care system and my next step is get cat scans and see a specialist

Duke, I really hope you feel better soon and that the Health Care system takes as good a care for you as you do for us.

 

[steubig]

geez. health stuff is no fun. hope it's easily handled.

 

[Passinwind]

Thank you guys so much for your concern!

I probably should have been a bit less cryptic... the lack of sleep is a side-effect of abdominal pains. I'm now working my way through the health care system and my next step is get cat scans and see a specialist. Okay enough of that crap!

Enough crap could be a good thing, just sayin'.

If an alien probe is part of the drill (see what I did there?), hold out for Class A cognitive obfuscation. Ignorance is bliss in this case, trust me. Hope you feel better soon man.

 

[bonin in the boneyard]

Class A cognitive obfuscation.

Swamp gas from a weather balloon was trapped in a thermal pocket and reflected the light from Venus.

 

[steubig]

lighter note:re the madonna inn.

the film "aria" (which was generally not-so-great) has a section that takes place almost entirely at the madonna inn.

julien temple, buck henry, beverly d'angelo, elvis impersonator, ecstasy, bambi all involved with "rigoletto"—a surreal and enjoyable 14 minutes (at least i thought so)

 

[Passinwind]

Swamp gas from a weather balloon was trapped in a thermal pocket and reflected the light from Venus.

"And you are...?"

 

[bonin in the boneyard]

"And you are...?"

On a more personal note Beatrice, Edgar ran off with an old girlfriend. You're gonna go stay with your mom a couple nights. You're gonna get over it and decide you're better off.

 

[DukeLeJeune]

...You speak english...

Sorry it took me over five weeks to respond to your post. So yes I speak English... but slowly...

 

[Lowendtech]

Sorry it took me over five weeks to respond to your post. So yes I speak English... but slowly...

Which is a good thing.

It allows us more time to absorb the lessons.

 

[roccobass]

View attachment 2981654

Swamp gas from a weather balloon was trapped in a thermal pocket and reflected the light from Venus.

Aren’t these lyrics from a Captain Beefheart song?

 

[Kirk Bryant]

For the unaware let me just say this. What we have here, in this young man, Mr. LeJeune, should be considered a national treasure. I'd posit that there isn't a builder on the planet that is as open, transparent, informative, educational, helpful, etc. with design of speaker cabs, including his own designs which most builders try to build a wall of secrecy around.
I personally love the non elitist, "this science is beyond you mere mortals grasp" approach, and candor we recieve from this man. It's a gift.

 

[DukeLeJeune]

For the unaware let me just say this. What we have here, in this young man, Mr. LeJeune, should be considered a national treasure. I'd posit that there isn't a builder on the planet that is as open, transparent, informative, educational, helpful, etc. with design of speaker cabs, including his own designs which most builders try to build a wall of secrecy around.
I personally love the non elitist, "this science is beyond you mere mortals grasp" approach, and candor we recieve from this man. It's a gift.

Thank you Kirk.

My only hope of selling my expensive little cabs is for people to see some merit in my design choices, so my transparency isn't totally free of ulterior motives. And the one thing I do keep secret is the specifics of my crossover designs. But just between you and me, my crossover designs are no more mystical than anything else I do.

Also, I would feel terrible if someone bought one of my cabs based on unrealistic expectations that I had created. So I try to be open about what I think their limitations are. If my marketing department hadn't quit over a wage dispute, maybe my claims would be more enticing.

 

[mexicanyella]

If my input swings any weight, I don't think you suffer for lack of a marketing department. Your supplied product info alone is so detailed, and delivered conversationally, that it is really fun and interesting to read ASIDE from being informative. Add to that your willingness to just explain stuff in a totally non-condescending fashion.

It seems apparent to me that I am not alone in feeling this way.

In fact, everyone's input on this thread seems to be pretty friendly and open and inclusive. AudioKinesis MindControl (tm)? Hmmmmmm.

 

[Kirk Bryant]

Jeeze Duke, I didn't think anyone expects you to be a Saint. Besides in my years in construction I "managed" many outside salespeople and some of the stuff those guys came up with boggled my mind. True salespeople are a different breed of cat. I was an inside sales guy that dealt with contractors you couldn't bs rather than civilians you could, and thankfully don't suffer the affliction of sales puffery. Which is also why I'm a better bassist than BL (salesman)
I suspect you're the same. And I'd call selling a world class product at a more than fair price simply making a living the way I was raised to think was the right thing to do. Providing quality goods honest service at a fair price. I'd call that an honorable way of living.