I have some experience with 3 different sets of affordable efficient speakers, some mentioned above. The amps I've run are a 3.5 wpc 2a3 SET and an 11 wpc EL34 SEP
1) Tekton Perfect SET - Clean, clear, and powerful. Nice deep bass, powerful dynamics, and excellent imaging. They can fill bigger spaces with full range sound very nicely. I did upgrade my caps and the improvement was great, I highly recommend the upgrade for high end SET enthusiasts.
2) 8008-Corner by Troels Gravesen - Similar to the Audio Note E, simple efficient 2-way kit with top quality parts. These are 92db eff., so on the lower end for SE amps, but the impedance is very flat and super easy to drive. (AN-E have overrated efficiency, so these are very close, Troels's article explains this) These are my top speaker, but best in smaller rooms and with corner placement. These have a vibrant, rich, and vivid realistic sound that performs very well with SE amps. Bass won't fully rival the Tekton, but it's there and they go very deep for a smaller 2-way. Daft Punk is a joy with my 11w SEP and not bad on the 2a3 either. I think the smaller transformers of the 2a3 limit the deepest bass.
3) Lii Audio F15 - Just got these and still need to build a baffle, but I'm starting to like them. They tried to tear my ears off with any volume at first, but they are settling in nicely after 4 days straight of run in. I think I'll like these better than other OB or Full Range single driver in the end. I also think they will need a sub to play as deep as the other 2 speakers above, but the baffle will certainly help too. There is still a bit of coloration from the whizzer cone, but not too bad and it might still get better with time. I'm really liking the big sound stage, excellent detail, and nice kick the 15" woofer has in the mid bass. I'm planning to build some flea watt amps to power these, should be fun.
1) Tekton Perfect SET - Clean, clear, and powerful. Nice deep bass, powerful dynamics, and excellent imaging. They can fill bigger spaces with full range sound very nicely. I did upgrade my caps and the improvement was great, I highly recommend the upgrade for high end SET enthusiasts.
2) 8008-Corner by Troels Gravesen - Similar to the Audio Note E, simple efficient 2-way kit with top quality parts. These are 92db eff., so on the lower end for SE amps, but the impedance is very flat and super easy to drive. (AN-E have overrated efficiency, so these are very close, Troels's article explains this) These are my top speaker, but best in smaller rooms and with corner placement. These have a vibrant, rich, and vivid realistic sound that performs very well with SE amps. Bass won't fully rival the Tekton, but it's there and they go very deep for a smaller 2-way. Daft Punk is a joy with my 11w SEP and not bad on the 2a3 either. I think the smaller transformers of the 2a3 limit the deepest bass.
3) Lii Audio F15 - Just got these and still need to build a baffle, but I'm starting to like them. They tried to tear my ears off with any volume at first, but they are settling in nicely after 4 days straight of run in. I think I'll like these better than other OB or Full Range single driver in the end. I also think they will need a sub to play as deep as the other 2 speakers above, but the baffle will certainly help too. There is still a bit of coloration from the whizzer cone, but not too bad and it might still get better with time. I'm really liking the big sound stage, excellent detail, and nice kick the 15" woofer has in the mid bass. I'm planning to build some flea watt amps to power these, should be fun.