New Stage Monitors Finished

[johnaec]

I took it upon myself to build some new stage monitors for my part-time band, seeing as I had the components on hand. I designed them to be similar in size to JBL's JRX112M, but with a 12" 2206H LF, 2426J HF driver, and PT waveguide horn, instead of the MI components JBL uses. The crossovers are of Zilch Design and construction.

I cut out all the parts for four of them, but so far, have only completed the first two. I'll post a few pics and descriptions in a few messages here.

The first pic shows the main panel parts, (most joints dado'd or rabbeted, with 30 degree butt joints on the back), and the second shows the special 30 degree braces needed for the back sides. The 3rd and 4th pics show how I used jigs for routing the holes required, and the 5th pic shows how the router guide sits in the router. This guide just follows the insides of the jigs around, and is much faster than setting up the Jasper guide for each hole. Any more holes, and I already have the jigs now :

[johnaec]

The first pic here shows the inside front of a cabinet, with 45 degree chamfer added for strength. You can also see where the 30 degree butt joints are for the backs. The 2nd pic shows a view to the inside, showing the braces that strengthen the butt joints. The 3rd pic shows an initial test assembly, and the 4th is one of the crossovers Zilch designed and built:

[johnaec]

Here are shots of a final version. First is a head-on view, and 2nd is a view from the side, showing the layout and handle. 3rd is a connector, with two Neutrik and Two 1/4" connectors, all wired in parallel, (for daisy-chaining). The 4th pic is a closeup of the rolled-on DuraTex finish, (thanks for the earlier messages here detailng this source!). It's the same stuff JBL sprays on, under their name of DuraFlex, and is really incredible stuff, and easy to work with! And the last pic is of a curve Zilch ran for me after completion. Red is measured directly on-axis with the horn, and black is on-axis with the center of the cabinet. We may do some more crossover tweaking later, but for now, they really sound excellent!

I'd love to have the lightweight SRX712 monitors like Bo uses, but these only cost me less than a 3rd what SRX712's go for, even on sale! These do come in at almost 50 lbs. each, but really aren't a problem moving with the handle.

All in all, a fun project with good results. And thank! Zilch, for the help with the crossovers!

John

[grumpy]

Nice work! Cool to see this start to finish in Reader's Digest form

-grumpy

[toddalin]

Very Nice! Love the texture.

[OldBlindJim]

Good Job

[Earl K]

Great Stuff John ! ( & Zilch )

[John]

Sweet

[Robh3606]

Nice

Rob

[grumpy]

BTW, if you ever abuse the Jasper Model 200 to the point of ruining the
-two- counterbored mounting holes (at least for Hitachi M12V), don't throw
it away...

There's room to drill/countersink four holes that match the normal foot/plate
mounting. I took care to accurately match drill and found the self-centering
action of the countersunk holes simplified setup, while the four holes on the
perimeter made the jig feel more stable and very unlikely to shift. -grumpy

[Ian Mackenzie]

Nice work John.

Ian

[timc]

Very nice work.


-Tim

[macaroonie]

With a good ending. They look super.

[richluvsound]

Looking Good .



Rich

[johnaec]

Thanks for all the comments, guys! Hopefully, I'll get to the second pair before long...

John