Marshall JCM800 series... HELP!!

#41
All four of the ports are schedule 40 3" inside diameter pvc pipe(1/4"wall three and a half inches outside diameter) and all four are the same length @ three and a half inches in length from internal face of front panel to rear end of the pipe. 4 inches total length if I measure inside the pipe from end to end
 
#43
Now from here you need to subtract the volume the speakers, ports and bracing take up from the total cab volume, then that will be the internal volume of the cab. Don't worry about the handles or connector, it's negligible.
 
#45
I took another look at the pics of the inside, yeah.... the handles do eat up a bit more space than I thought... gumtown was right to tell you to include them in the calculations.
 
#46
Also there is small wooden strapping that runs around the back that the rear panel attaches to which measures .75 inches tall by 1.25 inches deep on top and bottom.

The strapping on the sides are the same dimensions but labels have changed(.75 inches wide by 1.25 inches deep.

Also the vertical strapping doesn't run all the way to the top, it stops just a couple inches shy of the top and angles backwards. Not sure if this matters but I'm just trying to be as specific and clear as possible.

Truly grateful for all the help I'm getting and wanna try and be as little of a PITA about this as I can so if givin all the info I can helps I'm all for it
 
#48
image.jpeg
Also will this matter? The current brace attaches to this plywood which is then attached to the front panel, and the upper piece I'm unsure of, it doesn't seem to do anything, possible a cover plate for an original port or tweeter perhaps?
 
#49
Anything inside the cab that takes up a bit of volume should be considered. The connector dish and wiring aren't really a concern, but getting the calculations as close as possible is the best route, IME.
I consider the 10's I use in my cabs to be 0.33 cuft, YMMV.
 
#50
And also measuring the volume of the handles I'm unsure of how to measure them as they are a funky shape, and the speakers don't know for certain on either.

But I can give you what I do know the speakers are 5.25 inches wide at the magnet, and they're 10 inch speakers. There's 4 of them and they are four inches deep from the front panel to the back of the magnet
 
#51
I was under the impression that cabinet calc software took the speaker displacement/volume (the size of the speaker) into account in the math, but I could be mistaken though.

For the handles, a estimate would be all right, or you could tip the cabinet on it's side and measure how much liquid fills the handle cavity to the inside level of the box side (if it doesn't leak).

Would be a good way to measure the cabinet area too, but not practical, may some polystyrene beads perhaps, fill up the cabinet, then measure it out.
 
#53
The handles are dished and recessed into the cabinet. I've taken measurements, the one corner is curved so the volume will be slightly less than what my measurements will figure up to, but I think this will be okay as long as I'm close
 
#57
image.jpeg
Side C: 7 inches

Yes it is larger than that where it attaches on the outside but it's 7 inches at the inside face of the cabinet, the rest of it wont matter because it doesn't take up space inside the cab from what I understand.
 
#59
I tried to download the WinISD program lastnight but I don't have a computer, and my phone wouldn't handle the right JavaScript to support it. I know I'm asking a lot but could someone possibly run the data of all my measurements I've taken and run it through the software?

Does anyone know of a modeling software comparable to WinISD that will work on iPhone?
 
#60
Also my Carvin PS10's are the older ones that say MADE IN USA right on them, from what I understand these are better than the newer Chinese made PS10's and essentially the same thing as an Eminence Beta10-A.

This will help me to find out if the 200 watts is peak or RMS right?
 
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