Of course not! Your Transflex MLTL is your idea here. If you simply made a non TL box with a 6th order bandpass vent and K aperture then it would be called an XKi sub. 🙂
Wonderment and fanciful thoughts, make merry and be joyous!
OH GOOD !!! 😀
I just wanted to make sure that folks hadn't already been using the Karlflex name for other things ....
It is a such a glorious name!
OH GOOD !!! 😀
I just wanted to make sure that folks hadn't already been using the Karlflex name for other things ....
It is a such a glorious name!
No problem Freddi !
🙂
I am working on the idea of slapping the Karlson Aperture onto the front of these cabinets ... Just for fun i tried to sim it, using a longer s4-s5 segment (in exponential mode) and less S5 area...... I added 10cm to the path .... The cabinet stays around the right size .... I think i got it pretty close .... Tried simming a couple of drivers in it and the damping behavior is different now, drivers with weaker motors perform better, and the offset has changed a little ..
Im interested in your Transflex lab15 design. After reading some of the threads I noticed there is a 90L and 100L version. Is there really any advantage to the 100L version? If you wanted to install a grill over the speaker area, could you extend the throat above the speaker out an additional 1" to make room for the grill below it and not effect things much or would it be better to extend the top and bottom panels out 1" and not change the throat length?
Alans ,
the 100L cab will have a very small edge in output at 35hz, if you need these cabs to be portable then you might as well go with the 90 liter ......... (OTOH if they never need to be moved then there is a 50% larger design posted earlier in this discussion that has a few DB more output)
In regards to this current design there are other drivers out there that might want even more airspace in this offset cab ( 110 liters or more) so i just added the information to the sketch to show how the cab's width can be scaled up and down as needed ....... For the Lab15-4 (special edition driver) 90 liters in this design works well 🙂
As far as mounting the grill , you could do it using either method that you described , both would work without any noticeable change in performance ...
When you are building this box be sure to get some pictures for us along the way!😀
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MML,
Is there anything special we need to do with the S4/S5 area and does that have anything to do with the speaker cutout in the baffle?
Is there anything special we need to do with the S4/S5 area and does that have anything to do with the speaker cutout in the baffle?
Alans ,
To build the boxes depicted in the drawings attached to posts #932 and #941 just build using the dimensions shown, but you will want to add some internal bracing as you would with any folded horns... I can show you some examples if you like ...
With the Baffle be sure to cut the hole big enough so that the driver's surround cannot possibly hit the inside of the cutout, and since we are relying on the front gasket of the driver with this type of mounting you want to insure a good seal, air leaks will harm performance ....
It is common practice now to use PL premium or some other thick caulking type construction adhesive to glue at least the internal panels, or even the whole box if you prefer .... Since the caulking is thick (wont run like wood glue can) it helps to seal everything very well which is important because leaks between internal panels will also cause losses in performance ...
A good material to build these boxes out of would be a high quality plywood. Birch ply is very popular for these sorts of projects ....🙂 Light, stiff, strong and durable is what you want and a good plywood can do that for you ..
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I wasn't sure about the baffle cutout. I have seen where they use slots and rectangles in other horn loaded enclosures but was not sure. We are using 3/4" Baltic birch ply for the construction and will apply bracing and panel stiffeners as needed.
We have built some Eaw sb2001 clones with B&C 21SW152's in them but when we play in smaller places it would be nice not to have to carry those 250lb. boxes in. Thanks for all the info and I will upload some pics of the cabinets.
We have built some Eaw sb2001 clones with B&C 21SW152's in them but when we play in smaller places it would be nice not to have to carry those 250lb. boxes in. Thanks for all the info and I will upload some pics of the cabinets.
250 pound monsters ! EGAD!! Your backs will appreciate these smaller cabs for smaller shows 🙂
Ahh Ok , now i know what you mean about the baffle, you are talking about a slot loaded throat chamber, and yeah i designed this one to be wide open in front of the woofer's cone, no slot, rectangle or crescent or any such device but i could simulate something like that in software to see if it changes anything, could be a fun experiment ...
Sounds like you guys have some good experience already so this should be pretty straightforward for yah 🙂 Be sure to compensate the external dimensions for the thicker material..... I am looking forward to seeing your build pics ! 😀
I have a new PA top design based on 6th order bandpass XKi in the works. Drivers ordered
http://www.diyaudio.com/forums/full-range/268524-xki-xs-ab-initio-karlson-6th-order-bandpass-6.html#post4201290
Pair this with a Karlflex would be pretty cool!
http://www.diyaudio.com/forums/full-range/268524-xki-xs-ab-initio-karlson-6th-order-bandpass-6.html#post4201290
Pair this with a Karlflex would be pretty cool!
X,
Those little XKI boxes are intriguing ! Will be interesting to see the measurements. With the Karlson Aperture do you suppose the upper bandwidth will be even better than what is simulated?
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Tb ,
I know it would be easier to simulate in HR with the vent towards the top as in the XKI and Karlsonator style, or even Karlflex , but i am thinking that the way you have it depicted here (with the vent in the middle) it would be more of a job for Akabak , unless maybe we simulated the first portion of the box as a giant throat chamber with port (like i did with the ML-TP v 3.1) and then used an offset in the short S1-S5 segments to simulate the flare of the aperture with the vent in the center , there would be a little loss in path length but it could work and would still a be a form of 6th or 8th order bandpass...🙂
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In my models of the K15, the vent is simulated in the middle as shown in the K15 plans. It doesn't make a big difference in the sims but I have heard it changes how it sounds in real life.
MMJ, the K aperture does indeed increase the upper bandwidth much wider - Almost full range of the driver can handle it. So for a woofer that falls off at 5khz open face, or won't do better than that.
MMJ, the K aperture does indeed increase the upper bandwidth much wider - Almost full range of the driver can handle it. So for a woofer that falls off at 5khz open face, or won't do better than that.
Offset mod?
XRK ,
Full range(or at least the natural high end capability of the driver) would be excellent 🙂
If it turns out that it does have some amount of ripple & dip in response between the 3rd and 5th harmonics when measured then i had an idea for an XKi offset modification ... I don't imagine the mod would be terribly effective unless the cab was tuned higher since the stub section needs to be in the vicinity of one third of the FB's quarter wavelength, but maybe some stuffing in the stub section would help if it is a little short in relation to FB ...
I think some 100hz tuned XKi boxes as tops for a Mini-Pa system would be super cool !
Xrk , how would one of the XKi boxes simulate tuned to 95hz with the fantastic $6 surplus Cerwin Vega 6" driver from ApexJr.com? 😀
XRK ,
Full range(or at least the natural high end capability of the driver) would be excellent 🙂
If it turns out that it does have some amount of ripple & dip in response between the 3rd and 5th harmonics when measured then i had an idea for an XKi offset modification ... I don't imagine the mod would be terribly effective unless the cab was tuned higher since the stub section needs to be in the vicinity of one third of the FB's quarter wavelength, but maybe some stuffing in the stub section would help if it is a little short in relation to FB ...
I think some 100hz tuned XKi boxes as tops for a Mini-Pa system would be super cool !
Xrk , how would one of the XKi boxes simulate tuned to 95hz with the fantastic $6 surplus Cerwin Vega 6" driver from ApexJr.com? 😀
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A thought i just had
In regards to the above post (#976) ,
Since we are dealing with a shortened path via mass-loading maybe that amount of offset would still be fairly effective at smoothing out upper response ripple whether the box is tuned lower or higher as long as the port/constriction doesn't add an excess of path length ....... hmmmmmmm..
...
In regards to the above post (#976) ,
Since we are dealing with a shortened path via mass-loading maybe that amount of offset would still be fairly effective at smoothing out upper response ripple whether the box is tuned lower or higher as long as the port/constriction doesn't add an excess of path length ....... hmmmmmmm..
...
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Neat idea and it kind of resembles a Karlsonator now. Haven't looked at the Cerwin Vega blowout drivers before. I love cheap drivers. 🙂