First let's start with some largely if not entirely under-the-radar companies producing high-quality speakers that I have heard and admired but presently have no commercial ties to (this list is from memory and no doubt incomplete). In no particular order:
- SP Technology: Advanced constant-directivity waveguides, very low crossover for a two-way.
- Omega Loudspeakers: High quality, natural sounding full-range single-driver monopole and bipole speakers.
- Pi Speakers: High value, very well designed high efficiency kits.
- Cogent: High efficiency speakers using very cool field-coil drivers.
- Classic Audio Reproductions: High quality high efficiency speakers, possibly offering field-coil as an option soon.
- Magnestand: Superbly done hotrodded Maggies
- Intuitive Design: Incredible precision and quality
- ACI: Excellent sound from conventional drivers through very intelligent design.
- Von Gaylord: Again fairly conventional format, but superbly executed.
- Amphion: Relatively wide-pattern waveguides from Finland.
- Green Mountain Audio: Probably not exactly "below the radar", but imho the pinnacle of phase-conscious design.
- Sanders Sound: The return of Roger Sanders with his excellent electrostats.
- Sonicweld: My nomination for best speaker; not cheap, but this is how you do DSP right. Very intelligent design.
- Shahinian: Voiced for orchestral music, gives a richness similar to a good omni but with more natural image size.
- Analysis Audio: High quality full-range ribbon dipole.
- Linkwitz: Multi-amped dynamic dipole.
- Daedalus: High efficiency and quality without horns.
- Tonian Labs: High efficiency wideband drivers augmented by a supertweeter, very well done.
- Huff: On a custom basis, offers ultra high quality omni systems.
- S.A.P.: Strange little Italian speaker whose driver complement is visually reminiscent of a Fisher-Price toy but they sound great.
- Duevel: Innovative omnidirectional designs.
And here are some companies whose designs I have not heard but find very interesting:
- Hornshoppe: Very high performance from a small fullrange driver.
- KCS Loudspeakers: Incredible parts and build quality for the price; I am amazed at what John offers and conclude that his profit margin must be extremely small.
- Ridgestreet Audio: Very high quality parts.
- Wolcott Audio: Innovative quasi-horn high-output omnidirectional system.
- Morrison: Another innovative omni system, more compact than the Wolcott.
I am omitting several imho worthy-of-mention loudspeakers that I have commercial ties to.
edit: Shadorne, I also think very highly of ATC but considered it to fly "above the radar horizon". Amfibius, I should have included Lansche on my list; that was one of my favorite speakers at CES this year.
Duke
dealer/manufacturer