DIY gives music lovers and audiophiles the ultimate power.  First of all, DIY speakers use the same parts, building materials (usually), and design techniques of HiFi speakers in the 4 and 5-figure range.  This means you can have that "rich" sound at a fraction of the retail cost.  Second, by learning the science behind the design of loudspeakers, a lot of the mysticism and mythology that plagues the audiophile world becomes dispelled, and you learn what is important--and what is irrelevant--in exceptional sound reproduction.

Everything here is free. I am a lifelong speaker addict, and this is my contribution to the audio world.

DIY Speaker Designs

Bookshelf

Speedster Tang Band W4-1720 + Fountek NeoCD1.0  Outstanding bass from such a small woofer, pleasant midrange, and a ribbon tweeter.  All in a small footprint.  Makes a great rich boy toy	Overnight Sensation HiVi B4N + Dayton ND20FA-6  A simple, small speaker with surprisingly deep bass and a wide and deep soundstage.  These are a good bargain for such a small price.
Classix II Dayton DC160 + Vifa BC25TG15 One of the funnest speakers I've ever done!  Great bass, solid soundstage, and a pleasing sound that works well even with poor recordings.  Great for getting a big sound in a small living space.	Overnight Sensation MTM HiVi B4N (x2) + Dayton ND20FA-6  Like the Overnight Sensations, but louder!  Big sound, small package.  These could be very versatile, and have been used in a wide variety of cabinets.

Floorstanding

ZX Spectrum  HiVi M6A + Bohlender Graebener Neo3 PDRW  Contemporary-looking drivers. One hell of a 2-way!  Very pleasing sound.  Big, detailed, yet won't become fatiguing.	Amiga  Dayton RS180-8 + Vifa DX25TG  This is a design intended for those who want a boutique, audiophile-quality speaker but don't want to pay the 4-figure price tag.  For $200, they should not disappoint.
Core 2-way  Dayton RS180-8 + Dayton RS28 (A or F) A sister project to the Amiga.  Same cabinet and woofer, but different tweeter, and very low crossover point.  These are a solid performer on a wide variety of music.  They balance a big sound with the ability to resolve tiny details in recordings.	Tarkus  Peerless 830668 + Peerless 830657 + Vifa DX25  Wish there was some way to take the soul of the large Cerwin Vega and Klipsch "monkey coffins" of your sordid past and inject it into something a bit more modern and high quality?  Then this project is for you!

Home Theater

Swope HT  HiVi M6A, M5A + Dayton ND28F  MTM mains, TM surrounds, and a W/TM/W center channel.  Sexy looks and great sound!

Dipole/Open Baffle

Sunflowers   Dayton RS225 + Dayton RS125-4 + Vifa XT25  Very high-quality all-around speaker with a large soundstage and precise imaging, but with the "uncolored" midrange a dipole can provide.  Can be built in a variety of cabinet designs and should come in around $450.

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Tubifex Dayton RS125-4 + Tang Band 25-1719  Not your average "slap a speaker into a weird plastic thing and find out what happens."  The Tubifex are a high-fidelity pair of speakers with great imaging and a surprising amount of bass extension.

Designs with Drivers No Longer Available

I am leaving these up for reference purposes.  If you still have these drivers, by all means, build and enjoy these speakers.  However, please don't ask me for driver substitutions at this time.  Sorry.

Untitled Scan-Speak 8530K-00 + Hiquphon OW3 This is the best 2-way I've ever done.  Unfortunately, I did it for a client so it had to go.  However, I'll find a way to get my own soon enough (but I'll use the OW1 tweeter)	Girl from Ipanema  Dayton RS150 + Seas 27 TBFC/G  Seems everyone's done a design using these drivers; here is my version.  This is a sealed design, but the midrange and treble is really quite excellent, and very revealing.  Would work great for a Home Theater, paired with a sub.
Orient Express  Silver Flute W14RC25 + Vifa Logic AC25SG05-4  Uses very nice-looking, decent-performing, low-cost drivers available at Madisound.  They manage a surprisingly full and pleasant sound in a relatively small package.  Since they come in at under $100 for the pair, the possibilities abound for things you could do with them!	China Syndrome Silver Flute W14RC25-S + Vifa Logic AC25SG05  This is the "sister project" to the Orient Express.   They were meant to work as a Home Theater setup or bookshelf speakers.  They were voiced to sound best placed up near a wall. Matching China Syndrome Center Channel to complete the China Syndrome HT experience.
TRS-80  Dayton RS180S-8 + Vifa D25AG  In a situation similar to the Classix, what started out as a strange experiment in pairing two unlikely drivers ended up in an extremely enjoyable, inexpensive speaker.	Vaagens  Audax AP170G2 + Vifa D25ASG   I designed and built these for my father in law.  At moderate listening levels and above, these are some fun speakers for just putting on some tunes (dare I say "records"?) and kicking back, or putzing around the room.
Aethers  Dayton SD215 + TB W5-704D + Seas 27TDFC  A fun experiment in dipole mids  They won the Budget category at Iowa 2007 and InDIYana 2008.	Classix Dayton DC160 + Vifa DX19  Classic sound that goes down easy and is fun to listen to.  Great bass, for when you don't want to use a sub.  Very good starter project.

Extras

Other People's Projects - Here are a few writeups I did as I built some projects designed by some of the DIY masters out there.  I share them here because simply building a speaker is not necessarily an easy task.

Common Speaker Conversions - This is a simple excel calculator to perform a bunch of conversions I tended to need again and again while working on projects, but I got tired of using the calculator function on my phone.

I'll level with you - My audio manifesto.  This is what happens when a composer and musician also is a closet audiophile.  (Warning: contains unorthodox audio opinions)

Questions or comments? (DIY-related)

Free Crossover Design Service - Have a speaker that needs a crossover designed for it?