What are the basic performance specs and dimensions?
Dipoles are difficult to measure but bandwidth is around 30Hz-50kHz contingent on the room. Sensitivity is 96dB, max SPL are 110dB. Impedance remains above 3Ω. The head and woofer baffles are biwirable. The baffles are solid Spruce, the edge trim is Walnut or Maple hardwood. The phosphor bronze mesh is 2.5 x 2.5mm with a 68% openness gradient. The feet are seismic spring loads. Dimensions are 62 x 33 x 102cm WxDxH. Weight is 45kg/ea.

The Seligkeit would be a far bigger and far heavier proposition than the Libération.

Checking with Ivette about on-screen designer appeal, she thought the Libération's form factor suggestive of an owl, with the widebanders its eyes, the Raal ribbon its beak, the woofer its belly and the mesh profile two folded wings. Libby the owl? Though we'd lost Fuji a young Siamese to an actual owl whilst living on a small Sonoma County hill-top vineyard many moons ago, these owls would be perfectly harmless for current feline Blondie. She likes music and often curls up on a class A amp because of its warmth. For us there'd be no domestic disturbances with the Libération. I'd previously reviewed just two other open baffles. One was an actively driven heavily DSP-controlled Emerald Physics; the other the top Zugspitz Klang model above.

Zugspitz are a small German boutique operation whose speakers are based on Robert Bastanis designs and drivers. Their €28'000/pr Seligkeit sports one active 18" dipole woofer per side. I'd encountered more dipole bass in the massive H-frame subwoofer accompanying the German Cygnus Audio Quasar monitors with twin Beyma 38cm 15LX60 woofers; and in the high-efficiency H-frame subwoofer bases of Voxativ's 9.87 Pi system.

Cygnus Audio sub/sat system in Le Mont Pèlerin flat.

Whilst hardly comprehensive exposure, I'd very much enjoyed my prior brief boxless bass visitors. Invariably their speed, clarity and subdued room interactions were highlights even if despite top bass boost on their various plate amps, 30Hz had seemed to be the practical in-room limit. It had my going dipole bass notion end in a question of quality over quantity. This quick pictorial walk down memory lane demonstrated Martin's challenge of combining a widebander with dipole bass and not end end up with big boxy bass cabs. Unlike these three dipole woofer examples, his includes no plate amp. That transfers drive burden on your own amp; or a dedicated woofer amp if you biamp. In trade, his Libération woofer integrates uniformly shallow, hence cosmetically seamless.

Voxativ Pi 9.97 system in Le Mont Pèlerin flat.

How much visceral bass punch might it be capable of? We note that his woofer's front and rear see no immediate wall proximity to pressurize off from as they do in all these H-frame solutions. Those open just to the sides of their driver/s. Their woofer backs all see a cabinet panel, their woofer fronts all either another panel or a second isobaric driver. Going in, punchiness of bass was one of my questions. The other built on it by extending up the bandwidth. How much dynamic shove would I hear from open-backed transducers, period? Finally I was curious how the 'V-twin' widebander array on either side of the ribbon tweeters would telegraph relative to image size and soundstage precision; if at all. Time to return to the class room for lessons skipped.