Everyone I've been enjoying this subforum at AVS and wanted to post my latest project. I've done dozens of builds with audiophile raw drivers like Vifa, Morel, Dynaudio, Peerless and Dayton drivers, but having recently gotten back into speaker building wanted to try some of the great new pro driver options out there.
These speakers are solely intended for 2 channel audio.
I wanted to build something very loud, dynamic, transient and clean with flat response, home audio drivers sound good at reasonable volume levels but aren't very efficient and don't always have the fastest transient response or "attack".
Plus it will be a new experience and I'm sure to learn some stuff. =)
Initially I was thinking a build with the Seos 12, a decent horn driver, a 12" mid and 18" pro subwoofer. After spending weeks researching different drivers and options, I finally settled on the following:
Seos 12 horn with B&C DE250 compression driver
Dual Fatal 8FE200 8" in MTM configuration, final impedance 4ohms, price is right and they were well rates and had good response too, also the smaller drivers should reduce issues with lobing.
Magnum 12" Subwoofer from DIYSG, I nauseated over this choice the longest, I wanted 18" initially because well, they're freaking cool and I was really eying the B&C 18TBW100 but ultimately decided I really didn't need that much bass (I know, some of you are ROFLing right now), plus I can always build some bass modules later on if I want.
I was hesitant on the Mag 12 as I really wanted to use something with an accordion surround, I was down between the Kappalite 3012LF as it modeled really well and very close to the Mag 12, but advice from Erich put me over the edge.
These will be active run off my miniDSP 4x10, compression drivers will run off an Adcom GFA-545II, mids off an Adcom GFA-555, subs off a GFA-5800.
Crossover points will be initially 1500hz and 120HZ but everyone will be REW'd and EQ'd
I decided on a largish tower, OD are 50" tall, 15.5" wide and 15" deep.
Mids will see about 1.75ft in a sealed enclosure, they will go flat to 90hz, Subs will get about 3ft each with port tuning around 30hz with two 4" ports each.
Construction is heavily braced 3/4" maple plywood, bracing is 1/2" thick pine plywood.
I cut 1/2" dado grooves for the internal bracing, the bottom is only screwed in so I can remove it, that allows bracing panels to slide in from the front and bottom and stack in precisely how I need. I'll post more as it develops so you can see what I'm doing.
Bracing will be vented to maximize air space and rigidity.
I'm thinking of a 1.25" roundover on the front edges and possibly a 3/4" bevel on all other edges, I love the look of the exposed plywood layers.
Fun to note I have no CAD drawings, I literally do this all out of my head as a thought exercise and challenge, it takes an almost meditative focus (no distractions like someone talking to you) to keep track of everything and get it all right in one shot.
BTW I build all my speakers with this cheap and portable table saw, incredible piece of equipment if you're looking for a simple, accurate and cheap setup
More to come, I welcome any comments or feedback, Thanks!
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