Looks like all the posts from the last two days or so vanished. Just going to repost what I wrote, including the shitty pic that I took at night with my phone: As you can see I replaced the FE83En with 8" an widebander with whizzer cone. These are the Voxativ AC-1.6 drivers. I never really liked them at the High End shows, but I wanted to give Voxativ another chance. So I drove all the way to Berlin to give them a listen with my own gear on friday. There I knew within minutes of listening that they were for me. Simply put, these are the most realistic sounding, most resolving speaker drivers I've heard. The clarity, speed and articulation are incredible. The tonality of the drivers is almost spot-on, just that the different cabinets all add their own colorations. On-axis they have a rising FR, but it's smooth. The rising FR is needed so they don't sound dull in-room. Off-axis at maybe 15-20° it's flat. The whole off-axis response is fantastic. The dynamics are exceptional and I think beat every headphone I've heard. Transient response feels very natural: Not too sharp, but not dull like the FE83En. The paper adds very little coloration of its own and the little it adds adds a slight sweetness to the sound. The wooden cones use some special damping magic to keep them from ringing like mad. The treble is smooth, not only for an 8" widebander, but in general. I didn't believe that it was possible to make an 8" widebander with no resonances that I can hear, but they really sound like that. Very clean sound. Actually the FE83En has a rougher, grainier treble. The treble extension is great. I've seen measurements with -5db at 40kHz. The Lowthers don't even go to 20kHz. The imaging is actually more precise than the FE83En for some reason. Maybe my FE83En speaker needed more diffraction control (felt). I think even the bass quality was very good for an 8" driver and it didn't fall apart at higher levels. I also listened to the smaller driver, but thought it was less resolving and clear, not as fast, etc. I didn't find the smaller one to be more neutral, but I'm sure it measures better. I really can't emphasize enough how involving these drivers sound. I paid for the drivers on the spot and took them home with me. I stayed up listening to music all night. When I got up I started listening to music again. It's only now that I'm finally writing this, which I planned to do in the morning. Once you start listening you really don't want to stop. This is what it's about. What I was looking for was essentially a modded HD800 in speaker form. With the Voxativs I'm pretty much there. Two other options that I also considered were: A three way OB with an Accuton C173-6-90 midrange and either one of the ceramic Accuton tweeters or one of the high sensitivity Scan-Speak ones. A refurbed Quad ESL 63 I have no doubts that I'd prefer the Voxativ over either one, but I generally find multi-ways to chop the music into pieces, which sounds less natural than a properly implemented widebander. The coherence is real. With other speakers you can hear that the tweeter is not where the midrange is. The 2-way I'm building gets a pass because it's essentially a full range with sub speaker, but done right with a real crossover. This way I can get closer to a full-range point source minimum phase speaker than with a BLH, though I will build a BLH cab for the driver eventually. Electrostats just don't sound as dynamic and resolving. They don't grab me as much. So where am I now with my project? The Voxativ driver is extremely efficient. I have my doubts if a 2nd woofer in parallel (+6db) will be enough. I thought that there was no way they're 100db efficient and expected closer to 95db, but it seems 100db is actually sort of accurate from what I've measured. I made the baffles slightly higher to bump up the response below 1kHz a bit, which seemed to work well in making the mids extremely neutral. This means I need more bass, but I also want to keep it passive. The crossover I have is still from the old speaker. Obviously it needs a complete redesign now. Actually there's a suckout at around 200Hz now, because the bigger driver goes so much lower. When I invert the woofer the bass is gone because the Voxativ driver still puts out a lot of bass, even in its small baffle. With my baffles I'm aiming at around 200Hz for my crossover, but I will have to measure to be sure. Because the driver is bigger the listening height is too high now. The center of the driver is about 95cm from the floor and I want to make it about 80-85cm. This is a matter of personal preference, but I ideally want to make it symmetrical, which means for 80cm listening height the speaker would be 160cm (5'3") tall. That's pretty tall, but I also don't want to make a speaker for midgets like Pure Audio Project did. I need to find a better way to mount the widebander baffle behind the woofer baffle.