Omnitop 12 with deltalite 2512
Omnitop 12 with deltalite 2512
I tested them out today. Room is about 50'x70', church auditorium. I started with one in the center, and compared it to a Peavey PR15. Power amp was QSC PLX 1602 in stereo mode. Processing was DBX DR260, hi passed them at 100hz, so as not to skew the tests with the extra bass response the PR15 would have. The Omni's were cleaner and clearer and as expected, about 3 db louder. I set the eq for the omnitops with the RTA in the DR260 and then they really sounded sweet. I had to cut 100hz-800hz about 4-6db to get them flat. The upper mids and highs were nicely balanced. I put one Omnitop on each side in stereo about 6' to the top on stands. My goal was 105 db in the center of the room with headroom. They easily met my goal. I was taking db measurements in the center of the room, about 30' from each of the speakers. Speakers were facing parallel to each other, perpendicular to the centerline of the room (not facing inwards, not aimed at the db meter). I put on a cd and cranked it till I got my 105db, then checked the voltage at one speaker. It was running about 18v average, bumped 20v occasionaly. Did the same test with pink noise and got basically the same results. Music was crystal clear at 105db, 30' out, you couldn't talk to someone standing next to you. I am well pleased. Not bad for speakers that weigh in at 30# and only cost about $150 apiece to build. I tested them with pink noise, just under 3 volts(best guess 2.83v). They ran 102db with a radio shack db meter, which someone said are 2db low, so that would make them 104db, as they are supposed to do.
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Bill Fitzmaurice
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Re: Omnitop 12 with deltalite 2512
Above 100Hz the Rat Shack meter is pretty accurate, and 102dB is about right for pink noise. Measure them with a swept sine wave it's a few dB higher.brodave2 wrote:I tested them with pink noise, just under 3 volts(best guess 2.83v). They ran 102db with a radio shack db meter, which someone said are 2db low, so that would make them 104db, as they are supposed to do.
what's funny is how I stumbled onto this website. I wanted to build some new tops for a smaller rig, and I wanted to build some horns similar to the omnitops, because I had seen the design years ago and knew of the efficiency. I also wanted something lighter than what was commercially available. A friend on another forum knew what I was planning saw a post on the Fender forum about someone building some omnitops and he sent me the link. The omnitops are exactly what I was looking for. I plan on building at least two more.
