VOBA Know-How reference modular system (r. m. s.) is the top four-way
loudspeaker system compounded with several independent modules
(enclosures) that are set into the compact loudspeaker system. Final form
of the whole cabinet dossy appearance and at the same time optimum
acoustic quality of whole loudspeaker system was reached. Now we
discuss VOBA Know-How upper-most model (flag-ship) of VOBA e .a. f.
The model itself was designed and produced with any compromise.
Maximum care was devoted to each important parameter of whole
loudspeaker system.
Bass driver works into (especially designed for this model) an acoustic
circuit A.R.A.D.C. (Anti-Resonant Acoustic dumping Circuit) that is
produced from composite based on fenolic polymer, pitch and other
inevitable admixtures. In all critical places of the acoustic circuits the
precisely designed absorb sandwich, compact material with optimal
mutual dampening quality is placed there. An acoustic circuit A.R.A.D.C.
resists withstanding resonance in unrivalled way and effectively
eliminates the upright rise of stationary wave of air inside the baffle.
Each cabinet for middle drivers is designed for accomplishing demands
for optimal inner volume, form and materials of the baffle. Specially
designed and well-experienced optimalized mixture, which consists of
exquisite acrylate, polymers, elastomer, fabric admixtures and HDF;
was used for modulus' construction. Geometry and whole inner volume
of baffles for both middle drivers were preciously designed and
indisputably tested and experienced. There is also used a suitable
combination of muffle material with natural cell's structure (real sheep
wool), PUR and melanin resin's foams with optimal coefficient of
volumes weight; in purpose of a need to muffle in the work space inside
the enclosures.
The baffle's front side of the modular
system where the loudspeaker radiate
the highest frequencies and of the
sandwich construction is situated.
All speakers are installed into each
baffle by method developed and
successfully in use only by VOBA e. a. f.
The aim of this modification is to eliminate the transmission of relevant resonance originating by "acoustic stress" inside the system from baffles to drivers and back. We manage to project an optimal diameter of rounding the external edges in account of measuring. The edges on the critical front side are projected to participate in any negative way on the final frequency characteristics (mainly in higher frequencies).
The aim of this modification is to eliminate the transmission of relevant resonance originating by "acoustic stress" inside the system from baffles to drivers and back. We manage to project an optimal diameter of rounding the external edges in account of measuring. The edges on the critical front side are projected to participate in any negative way on the final frequency characteristics (mainly in higher frequencies).

Optimal position of speakers is reached by back warding of the front
side of the whole modular system. Similar "acoustic ways" from each
modular system's loudspeaker KNOW-HOW against the listener's
listening place is reached by this modification. On the front side where
both middle drivers are installed, the material AUDIOBAC (Audio Band
bass Absorber Compound) is placed. AUDIOBAC is specially designed
for referential modular system VOBA Know-How.
The bass driver, similar to
speakers for low-middle
frequencies; has the
membrane made from
carbon-paper composite
with direct-current
arrangements of filaments.
This modification wants to
deal with relevant parasitic
oscillations on the
loudspeaker membrane.

6,96inch low-middle driver overlarge driving and perfored permanent
magnet (all modified by the producer) is appended by the phase diffuser
made of alloy of callow metals. 4,44inch middle driver with overlarge
driving and polypropylene's membrane all specially designed for this
model is dispatched with similar phase diffuser. An alloy of callow metals
was used in producing baskets of all employed loudspeakers. Tweeter is
a passive ring radiator made of silk of a diameter 0,98inch, fits in
massive aluminium's desks. A stationary phase advancer is placed in
axis of the hirise alternator. All loudspeakers of the VOBA KNOW-HOW
system are modified by the new anti-resonant change A. R. J. (Anti
Resonant Junction). Aim of this modification is a minimalisation of
mechanical resonance and global improvement of electric-mechanical
parameters of the speakers itself.
The frequency filter of the modular
system VOBA KNOW-HOW is
compounded exclusively from parts of
referential quality.
For each frequency filter there were selected and used components and parts with the most suitable diameter of general quality (air core foil's, MOX resistors, special polypropylene capacitors with a silver and gold foil kept in oil, etc.).
For each frequency filter there were selected and used components and parts with the most suitable diameter of general quality (air core foil's, MOX resistors, special polypropylene capacitors with a silver and gold foil kept in oil, etc.).

Special output capacitors, same as all output interconnections of all
modules VOBA KNOW-HOW loudspeaker system, represent carefully
designed and procession of components of CABLE 4 YOU production.
Links among all parts of the passive frequency filter are traditionally
interpreted ("accomplished") with any use of "flat connections".
Each part of the frequency filter of VOBA KNOW-HOW reference
modular system are installed in independent functional units, which are
placed in the cabinet's back part.

Referential modular loudspeaker system VOBA KNOW-HOW is
recommended for installing into middle big sized and big sized listening
rooms.

System: | four-way modular system, with A.R.A.D.C. in the compact enclosure |
Drive units: | 1x10,03 inch, 1x6,96 inch, 1x4,44 inch |
Frequency response: | 1x0,98 inch (ring radiator) |
Sensitivity: | 23,4Hz - 22,5kHz 92db (2,83V/1m) |
Impedance: | 8ohm |
Dimensions: | 52,75x14,56x25,59 inches |
Weight: | 820 lbs 1040 lbs (shipping weight) |