EVID
EVIDTMTMOwner’s ManualOwner’s Manual
1212
Appendix A: Integrating the SubwooferAppendix A: Integrating the Subwoofer
Installation ExamplesInstallation Examples
The EVID™ Series is a product family withThe EVID™ Series is a product family with
the flexibility to fit the requirements ofthe flexibility to fit the requirements of
many different applications. Listed belowmany different applications. Listed below
are some suggested combinations forare some suggested combinations for
systems using the 12.1.systems using the 12.1.
••Rich, fRich, full-soull-soundinunding low-lg low-level bevel backgrackgroundound
music and paging in a quiet restaurant,music and paging in a quiet restaurant,
office, or retail space: two EVID™ 3.2soffice, or retail space: two EVID™ 3.2s
in parallel on each output of a 12.1.in parallel on each output of a 12.1.
••ModerModerate-leate-level muvel music asic and pnd paging aging in ain a
sports bar/restaurant or upbeat retailsports bar/restaurant or upbeat retail
space: two EVID™ 4.2s in parallel onspace: two EVID™ 4.2s in parallel on
each output of a 12.1.each output of a 12.1.
••HigheHigher-lever-level forel foregrounground musd music in ic in bassbass--
heavy applications such as dance floors,heavy applications such as dance floors,
amusement arcades, or loud bars: useamusement arcades, or loud bars: use
one EVID™ 6.2 on each output of 12.1.one EVID™ 6.2 on each output of 12.1.
EVID™ systems may be used together.EVID™ systems may be used together.
For example, a large hotel might use eightFor example, a large hotel might use eight
3.2s and two 12.1s in the dining room,3.2s and two 12.1s in the dining room,
eight 4.2s and two 12.1s in the lounge,eight 4.2s and two 12.1s in the lounge,
four 6.2s with two 12.1s surrounding thefour 6.2s with two 12.1s surrounding the
dance floor, 6.2s around the pool, 6.2s ordance floor, 6.2s around the pool, 6.2s or
4.2s with or without 12.1s in the lobby, and4.2s with or without 12.1s in the lobby, and
3.2s in the corridors.3.2s in the corridors.
Crossover Frequency andCrossover Frequency and
ImpedanceImpedance
The EVID™ 12.1 is designed to be usedThe EVID™ 12.1 is designed to be used
as a as a passive subwooferpassive subwoofer. No . No additionaladditional
amplifiers or signal processors areamplifiers or signal processors are
required to achieve full benefit of therequired to achieve full benefit of the
12.1's performance. The built-in passive12.1's performance. The built-in passive
stereo crossover sends the lowest notesstereo crossover sends the lowest notes
of both stereo channels to the 12" dual-coilof both stereo channels to the 12" dual-coil
bass driver and reduces the amount of lowbass driver and reduces the amount of low
frequencies sent to the satellite speakers.frequencies sent to the satellite speakers.
This allows them to play louder andThis allows them to play louder and
cleaner while presenting a more even,cleaner while presenting a more even,
amplifier-friendly impedance load than if allamplifier-friendly impedance load than if all
the speakers were connected in parallel.the speakers were connected in parallel.
The EVID™ 12.1's crossover tunes aThe EVID™ 12.1's crossover tunes a
combination of electrical and acousticcombination of electrical and acoustic
characteristics to complement thecharacteristics to complement the
response of the full-range EVID™ models.response of the full-range EVID™ models.
The crossover point is set electrically inThe crossover point is set electrically in
the 160Hz range with a topology thatthe 160Hz range with a topology that
enables the nominal system impedance toenables the nominal system impedance to
be determined by the number of satellitesbe determined by the number of satellites
per channel.per channel.
Using a Using a Separate Separate AmplifierAmplifier
Channel for the 12.1Channel for the 12.1
In certain specialized applications, it mayIn certain specialized applications, it may
be desirable to drive the subwoofer with abe desirable to drive the subwoofer with a
separate amplifier channel. In theseseparate amplifier channel. In these
applications the active crossover pointapplications the active crossover point
must be at or below 160Hz so as not tomust be at or below 160Hz so as not to
interfere with the built-in passive cross-interfere with the built-in passive cross-
over. Both sections (left and right inputs)over. Both sections (left and right inputs)
must be connected in parallel (4 ohmmust be connected in parallel (4 ohm
system impedance) when operating as asystem impedance) when operating as a
mono device. No load resistors aremono device. No load resistors are
necessary on the hi-pass outputs.necessary on the hi-pass outputs.
Characteristics of AllCharacteristics of All
SubwoofersSubwoofers
While subwoofers do radiate soundWhile subwoofers do radiate sound
omnidirectionally (in all directions) and theomnidirectionally (in all directions) and the
sound is generally non-localizable (onesound is generally non-localizable (one
can't hear exactly where it comes from),can't hear exactly where it comes from),
subwoofer sound level still drops off thesubwoofer sound level still drops off the
farther one moves from the subwoofer.farther one moves from the subwoofer.
The highest output and best room loadingThe highest output and best room loading
are accomplished with the subwooferare accomplished with the subwoofer
mounted in a corner at a three-boundarymounted in a corner at a three-boundary
junction (wall/wall/ceiling junction (wall/wall/ceiling or wall/wall/floor,or wall/wall/floor,
an arrangement also referred to as 1/8an arrangement also referred to as 1/8
space). Mounting at a two-boundaryspace). Mounting at a two-boundary
junction (wall/ceiling, junction (wall/ceiling, or 1/4 or 1/4 space)space)
produces three dB less output, andproduces three dB less output, and
mounting in the middle of a room in themounting in the middle of a room in the
ceiling (1/2 space) reduces output stillceiling (1/2 space) reduces output still
another three dB.another three dB.
Subwoofers produce large amounts ofSubwoofers produce large amounts of
long-wavelength low-frequency long-wavelength low-frequency energyenergy..
Every object has its own resonantEvery object has its own resonant
frequencyfrequency, and , and long wavelengths tend tolong wavelengths tend to
excite large objects (like walls, floors,excite large objects (like walls, floors,
doors and ceiling panels). Anything loosedoors and ceiling panels). Anything loose
in or on a ceiling or wall will buzz or rattlein or on a ceiling or wall will buzz or rattle
as a subwoofer's level is increased. Mostas a subwoofer's level is increased. Most
of these can be isolated and fixed withof these can be isolated and fixed with
small, strategically placed bits of foamsmall, strategically placed bits of foam
tape. Others may require driving additionaltape. Others may require driving additional
nails or screws and perhaps somenails or screws and perhaps some
caulking to dampen their sympatheticcaulking to dampen their sympathetic
movement. Be aware that as bass levelsmovement. Be aware that as bass levels
increase, so does the likelihood of rattlesincrease, so does the likelihood of rattles
and buzzes.and buzzes.