At 28 inches tall it may be shorter than most line arrays, but in sensitivity and response it's right up there with the big boys. Here's an SPL chart:

Here's a review, by builder Gavin Humphrey:

Well, I'm finally done building my pair of SLAs. They look awesome! Had my audiophile buddy give them a listen they other day and thought they sounded GREAT, smooth through all the frequencies.Great plans, fun build! Over the summer I'll build an auto tuba to go along with them.

What I really love about this cab is that I built it with closeout midbasses that cost 49 cents apiece and tweeters that set me back a whopping 24 cents per. The entire project including wood cost less than thirty bucks. Whether you'll be able to find drivers that inexpensive I can't guarantee, but even at ten times the price you'll save big time compared to what it would cost to buy a speaker of this quality.

You can build the SLA flat face as pictured above for vertical mounting, or in the curve face version shown here, for wide dispersion in a horizontal placement.

Also included is the SLA Pro PA top. Measuring 29 x 11 x 9.5 inches, it's the right size for smaller gigs, like weddings and corporate events, or for DJ monitoring. Loaded with four Eminence Alpha 6 woofers and a four or six element tweeter array, it's got the output and pattern control that line arrays are noted for, in a size that's easy to carry.

Construction Degree of Difficulty: 3

Performance Quotient: 8

Equivalent Retail Value: $ 799

Plans are $14.95, delivered within 24 hours as email attachment in MS Word format. 28 pages, with over 50 Photos and Diagrams. PDF version available on request.