Simplexx 12 Build

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Simplexx 12 Build

#1 Post by argon » Wed May 11, 2022 3:56 pm

So I’m finally getting around to building a few Simplexx 12 cabinets for a bass rig. I’ll start with a Simplexx 12 Tilt Back for practices and smaller gigs, and a regular Simplexx 12 to go under it for larger gigs. Since it will probably take me a while (even though it’s an “easy build” cab, it will probably take me longer), I’m planning on starting with the tilt back. I have a more immediate need for the tilt back, but eventually will build the second cab to go with it. Before I start, I have a few questions:

1. Will I need a horn in the second cab? I realize the “need” for a horn is subjective, and I’m planning on putting one in the tilt back. The tilt back will go on top when paired with the second cab. Will a horn in the bottom cab be redundant?

2. What’s up with the prices of Baltic birch? Holy shnikies, I bought one 1/2” 5x5 sheet today for $140. I’m in upstate New York, and the last time I priced it (which, ok, was awhile ago), the price was literally half of what I paid today. The guy at the lumber yard said it’s because it’s a Russian product, and they can’t get it anymore. Supply and demand, I guess. So my questions here are- did I get ripped off, or is this the going rate now? If so, what are some alternatives to Baltic birch, given the price and the scarcity of it. This guy only has two sheets left, so by the time I get around to building the second cab, he might be out. Should I bite the bullet and buy a second sheet now for $140?

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Re: Simplexx 12 Build

#2 Post by J_Dunavin » Wed May 11, 2022 4:07 pm

Plywood prices are crazy right now, though that seems a little high.
Look on market place, Craigslist, and make some phone calls to local cabinet shops, lumber yards and specialty shops. I found a place to buy Baltic cut offs for a really good price. May not be enough for a full build, but could help reduce how many full sheets you would need for s couple cabs.
Use cut list program to maximize your cuts, if your using multiple size sheets
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Bill Fitzmaurice
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Re: Simplexx 12 Build

#3 Post by Bill Fitzmaurice » Wed May 11, 2022 4:43 pm

Russian Baltic Birch isn't going to be imported for the foreseeable future, which also pushes up the price of that coming from the Baltic States and Scandinavia.

Bruce Weldy
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Re: Simplexx 12 Build

#4 Post by Bruce Weldy » Wed May 11, 2022 4:55 pm

As to your first question.....I'd stick with the horn only in the tilt back that you'll put on top.

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Re: Simplexx 12 Build

#5 Post by argon » Thu May 19, 2022 5:22 pm

Thanks for your replies. I assembled the main box portion of the cab, next step is the bracing and ports. So far, so good.

I ran into a snag when trying to order a crossover kit from Speaker Hardware. Unfortunately they’re out of stock. I ended up ordering the individual parts from Parts Express. The only issue I came across is that they didn’t have a 6uF capacitor, so I got a 6.2uF with 5% tolerance. Will this work, or should I keep looking?

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Bryan Cox
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Re: Simplexx 12 Build

#6 Post by Bryan Cox » Thu May 19, 2022 6:11 pm

6.2 uF is fine.
Otop 12 x 4 (Delta Pro 12-450a) 2x melded, 2x straight
Titan 39 x 4 (3012LF) 20" wide

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