1) don't ever try to take on designing 8 different speakers while also working a full time job, having a family including a now 22 month old that wants to spend every single waking moment with you playing, and a side business doing retail sales... Something has to give, and in this instance, it's been my ability to get all of the speaker design stuff done... building existing designs is a lot easier since I can solder crossovers at 3 AM and not wake anyone up (and he *loves* helping Daddy do woodworking, even if I have to keep the Makita track saw away from him for now
hehehe). I can listen to evaluate speakers capabilities with the little guy since he loves music. What he doesn't love is test tones and running tones over and over to take measurements of things to do crossover simulations.... I think I'm abandoning some of the other projects I planned besides just this big horn experiment and putting those drivers up for sale shortly.... it'll be 5 years or more at this rate of progress before I finish them all...
2) never build Wayne Parham's 3Pis with 1.5" thick cabinet walls, lined with bitumen and Blackhole 5 when you have a really bad back... unlike the big horns that have casters integrated into the design, trying to lift those 3Pi boxes onto stands threw my back out again to the point that I gave in and had to have spinal injections
... and then had a reaction to the steroids.... at least now that I'm over that, it appears to have worked.... no more constant, 24/7 searing pain shooting down my legs and making my feet go numb and not work.... it made walking a bit of a challenge at times
3) what little bit of crossover playing I've done (and most of the experimentation has only been in the last few weeks), I'm not sure I'm a fan of the Iwata for this room and specific goal for the speakers. On axis in the sweet spot it's *REALLY* good and pretty darn linear... as someone posted above, it has an ability to play huge and yet small at the same time....it throws a huge perceived soundstage, even when playing at really low volumes (something that surprised me as I expected I'd need to push the speaker a bit to get it going and to "open up" and "come alive", something that is necessary with some of the other SEOS designs I've played with (and even the 3Pis if I'm being honest).... electrically the most recent iteration currently being listened to has me using basically a first order slope, acoustically, with how I'm shaping and where I started rolloff slopes, it ends up being more like 3rd order, almost 4th order. The forward lobe just doesn't seem super tall or wide. Above or below and off to the sides a lot, or from another room in the house for background music, and it falls apart and treble response drops off a cliff worse than a typical short ribbon tweeter. I've only played the JBL with Truextant beryllium diaphragms through this horn... will still give the BMS 4592ND a shot... and if I can get better measurements and play with some sims, I might find a combo that gives a bigger window.... but I have a feeling that the Iwatas may end up for sale in the classified section before all is said and done... I'm switching to active to shorten experimentation time instead of having to wire so many different passive crossovers to test my ideas. Assembly times take too long...even just clipping them together seems to take much longer than I want to bother with and the couple that I spent the time getting really good connections by soldering instead of using crappy alligator clip leads sounded better (clip leads hurting sonics?)... so it's been a bit frustrating... if SEOS24 is no better in the top end, I may have to explore and add the complexity (i.e. opportunity to screw things up) super tweeter to add back the top end energy and let it splash around the room more...
beyond that, nothing to update. I'm going to switch to the SEOS24 shortly and try to get something wired up and playing with it in the next week or so... hopefully better overall results with it than Iwata so far....Edited by hometheaterdoc - 2/20/14 at 11:58am