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23in High 20in Wide 16in DEEP
- Thread starter Fred Mott
- Start date
Could be the port on the bottom is 1in and a half wide. I wish the slash button would work. across the front, and the size I gave. Just trying to decide the best speaker to use in it. Something I did forget to mention, at one time it must to have had a tweeter. There is a 2in hole in upper right hand corner if your standing looking at it.
The upper inside wall of that port should be shorter than the rest. You need to measure that depth.
There isn't any upper inside wall it's just open at the bottom, there is a brace in the middle that runs to the back, but besides that it is all open. That brace you see in the middle in the picture goes from there to the back and that's all. The rest is just open. I can stick my hand tru the port look down true the speaker hole and see my hand.
Then when you plug it into WinISD the port depth will be the measurement from the inside of the baffle to the front. If the baffle is recessed 1" the total port depth would be 1-3/4" assuming it's made of 3/4" plywood. I can run a quick model of it when I get home later but I can tell you now it's probably tuned a little high. That's better than being too low though. Means we'll add a piece of wood to the inside or block off part of the port to lower it instead of having to cut wood away chopping up the cab.
As for the old tweeter hole....we can either add a tweeter to it if you choose or block off that hole with another small piece of wood. Leaving it open will throw off the box tuning for the woofer. That open hole is acting like another port that isn't tuned right.
Can get more specific after I get back to the desktop or somebody else here could do it quicker.
As for the old tweeter hole....we can either add a tweeter to it if you choose or block off that hole with another small piece of wood. Leaving it open will throw off the box tuning for the woofer. That open hole is acting like another port that isn't tuned right.
Can get more specific after I get back to the desktop or somebody else here could do it quicker.
Load it with a 3015LF and a 6" mid...and then crank it the next time you are playing with him. See if he's still makes fun of you.
NOTE: Just trying to make a point, not making a speaker recommendation there.
Seriously though...you may have room for a mid driver where the tweeter was. That would allow you to use a true low end woofer with it.
Another thought might be to make a new baffle for it and load a 3012LF with a 6" mid.
Just thinking out loud here. I don't have time to play with WinISD at the moment. But if the port is that shallow, you may have lots of room to work with it by adding more material and extending it.
Can you get a photo of the actual cab?
As you can see, I had to put it in a chair in front of the computer, do you think its worth it. Its about the same size as my Jeff Berlin combo. I'am maybe going to put 3 or 4 coats of Duratek on it. Handles on the side, speakon, rubber feet. It came with a nice Black metal grill. I thought it would be away I could save money, and have a cab for my combo. I just cannot right now afford a Markbass cab. I thought maybe I could mask off the grill and maybe out maybe a half in yellow around the edge. are paint the speaker board yellow.
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It looks good to me. You might want to use some type of filler, like Bondo, to smooth out the outer panels before applying Duratex. You absolutely will need to adjust the tuning by installing a flat panel on the inside top port area. Let me get back to you with a suggestion for the speaker driver and tuning.
Here's my first recommendation. I like the Eminence Legend CB15 in your cab with a shelf depth increase of 7". That means you would need to install a board that measures 19" x 7" inside the cab on top of that support piece that runs the length of the port. You might have to cut it in half (two boards that measure 9.5" x 7") to get it in there.
This will give you a 3 cubic foot cabinet with a tuning of 46hz. It will have an f3 of 55hz. It will be able to handle all that your Markbass combo can throw at it. If you want improved specs (such as lower bass) you will need to spend a whole lot more than it costs for the CB15 ($100).
This will give you a 3 cubic foot cabinet with a tuning of 46hz. It will have an f3 of 55hz. It will be able to handle all that your Markbass combo can throw at it. If you want improved specs (such as lower bass) you will need to spend a whole lot more than it costs for the CB15 ($100).
I'll throw in the somewhat obvious, more expensive option. 3 cubic feet makes a nice home for an Eminence Kappalite 3015.
I like the legend in this case too unless saving 5 or so pounds is worth the extra expense to you. The legends displacement limit will be 200 watts or a little better. Considering available amp power any more isn't needed, that's already better than most. Get the tuning down to 50 or a little less and it'll be fine.
Look up kapplite3015 (not the LF model) and see if it's worth it to you. It will have a middier tone, legend will be a bit warmer sounding.
In shelf ports like that the walls serve as a bit of a port extension making the tuning a bit lower than predicted. If there's 1-3/4" of port of now adding maybe 5" to the inside would be fine. Maybe even less. I'm a bit confused as to the actual measurements. I used 3.25 cu.ft. and a 18-1/4 x 1-1/2 port.
Look up kapplite3015 (not the LF model) and see if it's worth it to you. It will have a middier tone, legend will be a bit warmer sounding.
In shelf ports like that the walls serve as a bit of a port extension making the tuning a bit lower than predicted. If there's 1-3/4" of port of now adding maybe 5" to the inside would be fine. Maybe even less. I'm a bit confused as to the actual measurements. I used 3.25 cu.ft. and a 18-1/4 x 1-1/2 port.
I've order the Eminence CB158 and all the handles. 1 gal. of Duratek,if have any left over may do a small cab. I got me some bondo. I am putting a speakon and quarter in jack on it. I have added the the 7in inside for the port, now just waiting for all the stuff to come in. Everything will be on hold for a while. Got to wait for everything to get shipped.
