Hello everyone - first post
I am an amateur at nearly everything I most enjoy doing-music as a player and a listener is a big part of my life.
I have been playing keyboards, primarily virtual pianos and virtual Hammond organ through a pair of Behringer powered PA speakers. I used them for playing small venues in the past, but now they are more or less permanently in my basement practice space. Recently one of those PA speakers has developed a bad hum and I am using that as a good excuse to build amplification for my keyboards and vocal mixer that would work better in my smallish practice space.
My thoughts returned to many years when I built simple open baffles for a pair of vintage Western Electric 755A drivers (I worked for the phone company and these speakers were abandoned in place in central offices. When they refitted Central Office for new equipment the speakers and their enclosures were tossed out and I rescued them from the dumpster). They sounded very good indeed in the place that I still use as a practice space.
Sooo I bought a 3 channel class “D” 3 channel 1200W stereo+sub amp (250W/250 + 700sub channel with adjustable crossover) and speakers (2 Eminence Beta-12CX 12" Coaxial Driver, 2 PRV Audio D280Ti-S 1" Titanium Horn Driver, LaVoce SAF184.01 18" Subwoofer, 2K LPF and HPF). I was intending to put the 12’s in OB and the sub in an H cab. My concern is the QTS may be low for open baffle… or maybe not. The Eminence 12’s QTS is .48 and the LaVoce QTS is .3 I bought these for their power handling, but didn’t realize that OB driver’s recommended QTS is .7 and above.
I read through the Linkwitz site and although the science is way beyond my pay grade, I did notice that the drivers he recommends for his designs are often below the recommended 7.0 QTS. Given the relatively low QTS of the drivers I have what results could I expect if I were to build an OB system with the components I have on hand. Would you recommend I return the drivers and start fresh with more appropriate components… perhaps the Eminence Alpha 15A and a separate tweeter…and who knows what Sub?
FWIW, I am using a small Mackie mixer for input and have a Behringer Ultragraph Pro 31 band 3 Channel EQ with12dB gain and cut and the speakers I bought are unopened and still in their boxes.
