This SPL chart compares the woofer response of the OTop 1x12 and OTop 1x15, loaded with the Eminence Deltalite II 2512 and 2515 respectively.

The OTop 15 has enough bottom to use it for PA without a sub in live-sound applications, or as an electric bass cabinet. In fact, it has way more bottom than any other 22x22x18 inch 45 pound cabinet, while above 100 Hz it beats commercial cabs that are a lot larger and heavier. This SPL chart compares an OTop 15 loaded with a Deltalite II 2515 woofer and ASD 1001 tweeter to the $1,600, 96 pound Community Sound iHP1544:

The 5dB average sensitivity differential means an OT15 driven with 200 watts is as loud as an iHP1544 driven with 700. The OT15 can be built with a single compression driver on a CD horn, or it can be built with a 10 element vertical tweeter array for line-array stacking of multiple cabs. The OT15 also may be built with a 20 element melded tweeter array, pictured above, giving high frequency dispersion and pattern control that no commercial PA top can match.

Need more power? Build a 2x15 loaded with Kappalite 3015 woofers for 900 watt power handling with sensitivity that no commercial cab of equal size can match.

OTop 15 may also be built with the same HF section as the DR300, for unsurpassed line array performance at the longest throw distances.

The plans go into great depth, showing you not only what tools to use but also how to use them. Included are tutorials on driver wiring and crossovers.

Construction Degree of Difficulty: 3

Performance Quotient: 8

Suggested Audience Size in PA use, 1x15 version:

Two cabs to 200; four cabs 150-400; six cabs 300-600; eight cabs 500-1,000

Suggested subs: Tuba 30, Tuba 60, Titan 48

Equivalent Retail Value: 1x15 $999; 2x15 $1599

Plans are $14.95, delivered within 24 hours as email attachment in MS Word format. 36 pages, 16 photos, 69 diagrams. PDF version available on request.

Also includes an active 3D program so that you can view the cabinet in any orientation with X-Ray vision!

Can’t build your own? Contact the nearest authorized Builder for a quote.