Originally Posted by donktard
How/where was that measurement made? Outside (quasi-anechoic?) or at listening position? If at listening position is there any room treatment?
donktard, the measurements were made with the horn mouth as close to the center of the media room as possible to get it as far away from reflective surfaces as possible. The UMIK was positioned on the floor, business end of the mic even with the horn mouth. The UMC22 soundcard was plugged directly into the EP4000 amp, so no (intentional) alteration of the signal at all.
I'd love to be able to take it outside and get some anechoic measurements, but a little history on the horn: I wanted a single large horn, and the simplest possible build. I wanted the Loud and Low elements of a system (the best compromise that could be reached at least), so the Iron Law meant "not Small." There is no way to move a large cabinet into/out of the basement due to dimensional restrictions on the old house ... just wouldn't fit. SO, it needed to be built in place, and thus one reason for the desire for a very simple/low-complexity build ... if/when I leave this place, it will simply have to be cut up and scrapped, so why do a fairly elaborate build like the G-horn, Lilwrecker or Submaximus? The time constraints of my school program (last semester toward a degree in Physical Therapy) were also a factor.
So I built it in place.
I am planning some measurements from my MLP this weekend, if I can. I'm interested to see what the room is doing to my signal.
No, it's not the sexiest system on this or any other forum and I could give a squat less. It is a very
successful solution to my needs. And minus the cost of the amp and a few odds & ends like terminals and wire, the cost is ~$700. Given the sensitivity on the system, a person could go with a used good quality middlin' sized pro amp and get a ton of output. Attached is a screenshot of the system with 900 watts RMS that a used QSC 900 like I have sitting around, $129 delivered, would model in this system at 1340 watts peak (as per the rated 1.9dB headroom) This is a lot
of performance for that price, if a person didn't have an issue with the size (and I don't, within reason).
Here is also a HR prediction of the system sensitivity compared to the well-proven Othorn. That kind of sensitivity approaching 20hz is pretty darn good. Othorn in gray, both systems at 1 watt into rated impedance.