That is an incredible lineup of Kondo amps! Thanks for the pictures and report, bonzo75.
Did you bring along the Bach cantatas disc listed as a reference at Zero Distortion, and if so, how did it fare on the field coil speakers? I don’t have a lot of experience with field coils and am curious to how they sort through complex counterpoint and timbres - thank you
Hi, I stopped using CDs and streaming for evaluation of speakers and amps long ago. I did out of interest compare his Marconi PX4s in the Lampi because I hadn't heard the Marconi PX4s before (though I had done a detailed compare of different Marconi PX25s with KR). I do love that Bach Cantata, and other cantatas in general though.
Regarding field coil, I would suggest you don't pigeon hole things in single drivers and field coil kind of theory. This is what DIY beginners do, it is the equivalent of making 2 curries at home and thinking all Indian curries would taste similar, or going to Olive Garden and thinking that's how Italian food is.
You can make a good horn out of various drivers, provided top and bottom are all coherent, integrated, aligned well - that requires matching of drivers, crossovers, and horn structure.
I have compared at Slivercore's GIP field coil, Line Magnetic field coil, and his own. The GIP sounded the best, the LM the least. A lot of people have tried to make their own field coils from lowthers and Altecs - some might have succeeded. I believe Dave Slagle also made FC of Lowther and from Radian as well. The Dava field coil and Audio note field coil carts have no similarities in sound.
Apart from being field coil, the Feastrex is also single driver. I have heard 4 single drivers now - the same Yamamura in two different rooms, Pnoe/AER in various upsteam electronic chains, and Cube Audio in 3 systems. A single driver can sound pretty bad till it sounds great. And it sounds great in extremely limited electronic chains. The Yamamura worked only with the Yam electronics, Pietro never got it to sing with Kondo and Shindo. The Pnoe with the Mayer 46 and Vyger RS could be the best of systems, could be awful with minor changes. The cube did not sound remotely good in the set ups I heard.
The owner of the Feastrex himself will tell you that his cabinet is a compromise on size. If you want to audition feastrex, you might want to contact Lotus Granada and see how it sounds. But think of it as auditioning Feastrex Lotus Granada, don't think of it as auditioning field coil or single driver. It will have no similarities with WE field coil or with Pnoe AER Vyger RS.
The Pnoe AER and the WE work best with very low watt amps.
The Feastrex I heard sounded progressively better with higher wattage. The Gakuon mk1 at 50w, then we tried a GM70 locally made I like at 14w with lot of drive, and copper tube. The lower watt Kondos were not as suited for this speaker. The difference between a small bass reflex cabinet and a backloaded horn the size of pnoe is huge.
But to your query, yes both field coil and single drivers can play large scale if set up properly. At the same time if you want to go this route, you should get a good horn set up you hear properly and like, not wait for field coil or single driver only.