Alphasonik PFZ325E ユーザーズマニュアル

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It is always best to plan the complete installation prior to 
attempting to install any product.  The routing of wires, power 
connections and mounting locations should be planned first.  As 
with any car stereo installation, all work performed should be 
checked thoroughly and carefully prior to the operation of the 
system.
 
  The placement of your Alphasonik speakers within your 
vehicle will greatly affect the overall performance of your audio 
system.  Installation in every vehicle may not be possible 
without modifications.  Factory provided locations are generally 
preferable due to ease of installation.  In all cases speakers 
should be placed in a location free of obstruction by body 
panels, window cranks, storage compartments or anything that 
may hinder the speaker's performance.  Avoid areas that do not 
provide a flat, sturdy mounting surface.
 
    Alphasonik speakers are designed to fit in almost any 
factory location.  Again, if at all possible, it is recommended that 
you use a factory location.  This applies mostly to later model 
vehicles.  For those earlier models that do not have factory 
locations or are limited to front locations, it is recommended that 
you choose an area with sufficient air space.
 
    If you allow an insufficient amount of air space, the 
speaker may not reproduce low frequencies very well.  It is 
recommended to mount the speakers in door panels, kick 
panels, rear decks, etc.  Ideally, the speaker should be mounted 
where it will be in an enclosed airspace, allowing for extended 
bass response.