Reference 811w,1011w,1211w OM 7/14/98 10:31 AM Page 2
WARNING: Playing loud music in an automotiveA FEW WORDS ABOUT ENCLOSURESENCLOSURE CALCULATIONSAND
environment can permanently damage your hear-
ing, as well as hinder your ability to hear traffic.BUILDING BOXES
The maximum volume levels achievable withYour Reference Series subwoofer
Infinity speakers, combined with high powerrequires an enclosure to realize its full low-Use the recommended box designs onmaterial inside the box. Rectangular vents
amplification, may exceed safe levels for frequency response. The speakerOs design isthe enclosed data sheet. Choose cabinetcan be used as long as the cross-section
extended listening. We recommend using low flexible enough to produce exceptionaldimensions to fit your vehicle, but do notsurface area matches the recommended
volume levels when driving. Infinity accepts results no matter whether you specify achange the enclosureOs volume. Doing soport-area values in the enclosed data sheet.
no liability for hearing loss, bodily injury, or small sealed, vented or bandpass enclo-will change the tuning frequency of the5. When using vented boxes, we recom-
property damage as a result of use or misuse ofsure. In vented and bandpass enclosures,enclosure and may adversely affect finalmend using a subsonic filter (like the DBOa
this product.box size and port tuning frequency will alsoperformance. If you cannot perform thefeature found on Kappa Series power
help dictate the low-frequency performance
necessary calculations yourself, please con-amplifiers) to limit the power sent to the
and output capability of your system. tact your authorized Infinity dealer for help. speaker at frequencies below, the enclo-
Your Reference Series subwoofer will
In addition, there are a number of pointssureOs port tuning frequency, thus limiting
also work in infinite baffle applications
youOll want to keep in mind as you con-the speakerOs excursion.
where there is no space or budget to buildstruct an enclosure:
a box. Be aware that infinite baffle or Ofree
1. Use 3/4" (19mm) MDF (medium-density
air� mounting will reduce the power han-
fiberboard) or marine birch wood to build
dling of any subwoofer compared to anan enclosure. Enclosures for 12" and larger
application using an enclosure.
subwoofers, or small subwoofers driven by
Finally, any deviation from recommended
high-power amplifiers, should be construct-
enclosure volumes or port dimensionsed using 1" (25mm) material.
should be made using dedicated enclosure-
2. Seal all joints with glue and screws; do
design software. If this type of software is
not use nails. We recommend "deck", "zip"
not available to you, ask your authorizedor drywall screws since they have coarse
Infinity dealer for help.
threads for better grip and donOt require
pre-drilling holes. Once the box has been
tested, seal all interior joints with silicone
caulk.
YOUR CARAND BASS REPRODUCTION3. Depending on the application, fill the
enclosure according to the design you have
chosen from the enclosed data sheet in one
Depending on the size of the vehicleOsof three ways: zero-percent fill (i.e., no fill),
interior listening space, reproduced fre-50-percent fill (i.e., 1"-thick polyfill sheets on
quencies below 80Hz are boosted by nearlyall inside walls except where subwoofer is
12dB per octave in the car as frequencymounted), or 100-percent fill (i.e., entire box
decreases. NOTE: This effect, known as theis stuffed with loosely packed polyester
vehicleOs transfer function, plays an impor-fiberfill).
tant part in shaping the overall in-car4. Use PVC or ABS pipe for ports. Keep in
response and is displayed graphically alongmind the openings at either end of the port
with freespace response on the enclosedmust be at least one port diameter away
data sheet for your Reference Subwoofer.from any obstructions, including filling |