With a height of 50 cm the Bifrost is an exceptionally high bass reflex speaker.
The name "Bifrost" originates from the Nordic mythology (a bridge
linking the empire of the Gods with that of men).
The cabinet can be built either from wood or stone. Those of you who wish to have a cabinet made of stone can purchase this from Valeria Audio (phone: +49 - 2272 - 90 49 00).
The crossover consists of a 3rd order filter for the bass driver. The bass driver shows a slight exaggeration at 4 kHz. This exaggeration is eliminated by a steep crossover cut-off. A different solution would be to use a bandpass filter to suppress the resonance. The tweeter is cut-off with 2nd order filter.
Excerpt of the review in Klang+Ton 4/2008 (with stone cabinet):
... "The performance was amazing and impressive. It's the combination of excellent
drivers, the neatly designed crossover and the unrivalled, solid cabinet that
produced the immensely tight and balanced, but equally dynamic and punchy
sound. Short picking noises, snare drums and percussion reminded me of horn
speakers. There is, however, no colouration - only a touch of presence. The
miracle extends to the bass section. The bass is rather subliminal, but shows
a might and superiority for a 17 inch that's difficult to equal. Certainly,
the stone cabinet seems to have the finger in the pie. I am trying to visualise
how the cabinet is holding the basket firmly in place, totally unimpressed
by the driver's movement, while the large voice coil supported by powerful
magnet a kicks the cone in the butt with such a vengeance that the membrane
doesn't have a choice but to move the air in front. The tweeter, designed
already with a punchy performance in mind, also likes the stone-dead cabinet
and concentrates undisturbed on the filigree of high frequencies. The staging
of these speakers in our listening room is incredible. Regarding dynamics
there are not only a match for the Bifrost, they clearly outstrip them and
reproduce at the same time considerably more details." ...
Price for Bifrost kit without cabinet per speaker:
EUR 751,00 excl. VAT: € 631.09 / $ 668.96
Please note: This kit is equipped - according to Klang+Ton
- with Intertechnik PK14/58MS/NI binding posts which we supply as well. The
surcharge is 12 EUR per speaker. The following kit with high-end crossover
also contains the PK14/58MS/NI binding posts.
Since core coils produce non-linear distortion, generating additional harmonics not contained in the original music, we supply our high-end crossover with coreless coils, i.e. air core coils. As coils for the signal path we chose cfc coils, for the tweeter we took a baked varnish coil.
The capacitors in the signal path are lowest-loss Mundorf MCAP Supreme, otherwise
Mundorf MKP capacitors with 400V.
Our high-end crossover components:
Price for kit with high-end crossover without cabinet per speaker:
EUR 966,00 excl. VAT: € 811.76 / $ 860.47