Saturday, April 10, 2010

PA speakers

I made these speakers for my musician friends, colleagues at work, who formed music group "Coomasie Blues Band". These speakers were made for their rehearsal and small venue concerts. These speakers are made of 18" high power PA woofer per side, four 6" Dayton PA midranges, Radian 485 2" compression tweeter and Selenium supertweeter.
Speakers are very efficient, sound is powerful and authoritative, but not flat. Woofers can not keep up when it comes to the efficiency with the rest, radians are most efficient and have to be tamed by the L-pad. Open baffle midranges give the speakers clean sound, especially for voices, which these speakers are mainly used for. Much better than if voices are handled by 15" PA woofer.

These speakers are powered by Behringer 2500 watts amp and use Behringer Ultracurve equalizer. You can see the eq required to make these speakers flat in the living room. Radians need to be lowered as most efficient, woofers roll of too soon, but that's fine for PA, especially if these are for vocals mostly. One has to be gentle with volume control, as it goes loud very quickly. At one party we tested the speakers a was unbearably loud at 50 watts only, so efficient are the speakers. I once powered the speakers with 2 watts OTL tube amp, that was all needed for normal listening. Ideally one should biamp these speakers.

Update...these speakers were converted into domestic, since the music group no longer performs. Tweeters were too high, so I moved them lower to the ear level, Radian horn was not needed, was removed and sold, and crossover was simplified and optimized using Holm Impulse software. I added external crossover into wooden box. Bi-wiring is possible. Speakers sound exceptional, highly efficient, dynamic, yet balanced and pleasant sounding. They sound good quiet or loud, they do not care, they just play nice music. NIKKO high quality electronics helps too. Some pics...