Yet anther DIY 4344 project

[jblgo]

hello, the plan is to build a 4344 the DIY way, the component list is 2405, 375 + wood horn, 2123 mid and 2235H with two passives.

The problem is I'm not a wood worker period, therefore I prefer have the sawing performed at nears home depot. To get started, does a forum member have the enclosure layout which to parse the 4*8 participle board.

How many sheets are required and what is the thickness?
Does someone have source for the foilcal.



thanks

[Mr. Widget]

Welcome to the forum!

Sounds like a great project, but not a simple project to tackle if you are a newbie and especially if you are not an accomplished woodworker.

When you say, two passives, are you referring to the networks, or passive radiators?


Widget

[jblgo]

Thanks for the welcome, I been a long time lurker.

I don't have the patience to cut wood, but marvel at what others on the forum have created. Will see how this plays out.
In the meantime, each speaker will utilize two passive radiators in a seal enclosure driven by a plate amp.

I thought about creating a 4345 monster, but the size of a 10cft enclosure is a show stopper.

Btw , are the 4344 CAD file available

[BMWCCA]

I can't help but I am a bit confused:

How is a 4344 with TWO passive radiators in each box smaller than a 4345? And how can even one passive radiator work in a sealed compartment, much less two?? It's a push-me-pull-you proposition. Sealed compartment with a woofer, maybe, but why two PRs and what size would they be? Better question might be why any PRs at all. I would think stand-alone subs might be a better solution . . . if you think the 2235s won't cut it.

I think we may have a semantic issue: How do you define a passive radiator and why would they need a plate amp? Do you mean subs in a separate enclosure driven by a plate amp? That's what I'm guessing.

All the best with your project.

[jblgo]

When using a 2235H, I prefer the sound quality of passive radiator over a ported box.

The plate amp will drive the 2235h and actively crossed over to the 2123H (slope and crossover pt to be determined)

The information stated below is what I remember (Dickerson loud speaker design or internet lore) For sub-woofer application, the passive needs to displace twice the volume of air as the main driver (Assume identical suspension) . The Box volume calculation for the port and passive radiator are identical, for a 2235H aprox 5 cubic feet. The passives are JBL PR15 (foam surrounds).

The end results will be a DIY design similar to the classic 43XX, but with the tonal qualities which I deam important.

I considered a single sub1500 or two 2235H or a single 2245 per box, but decided against all three. Any advice in locating a CAD file, I have access to AutoCad and Sketchup.

thanks

[Mr. Widget]

I am not sure if 4343 or 4344 CAD files of the cabinet designs have ever been posted here. These are not designs that I have studied of closely followed, but even if they have been, it seems you are drifting far enough into custom DIY territory that I’m not sure how useful they would be to you.

I understand that a properly set up passive radiator design will use the same box volume for a given tuning, however since you need to locate the extra 15” radiator, the cabinet and it’s bracing will need to be altered, possibly significantly.

On a separate topic, you mentioned getting the panels cut near Home Depot. I guess you are planning on purchasing your raw material there. In general they do not offer cabinet grade material like Baltic birch plywood and 1” MDF. Even the 3/4” MDF that I have seen at HD isn’t particularly of high quality, but this may vary from store to store.


Widget

[Don C]

It's not clear from your post that you mean to have the wood cut at Home Depot or not. Just in case that is what you meant, I'll share that I once had that as the starting point of a plan. It seemed like a good plan at first. Sorry to step on your dream. It didn't work. Those large panel saws at Home Depot will not give you panels that are square. Not even close. The parts won't fit together. You can have the wood cut into rough sections there and then start trimming until you can make some that are square, but much patience is needed. Also, they don't have any nice wood there, as Widget mentioned.