Snell XA2900, Руководство пользователя

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O P T I M I Z I N G T H E S O U N D , S Y S T E M A D J U S T M E N T S
Probably the most unique feature of the XA 2500 is its total
adjustability via a number of band trim switches. At Snell,
our experience with installing and optimizing our systems
into a variety of homes has taught us the value of fine
adjustments to a speaker’s balance to suit both the
acoustics of the room and the characteristics of allied
equipment.
To do this we have split the sonic spectrum up into 4
sections. Each section has an electrical switch with 3 subtly
different setting. In the following section we will describe
what to listen for in each band and how to adjust them for
optimum performance.
First please note that all adjustments are subtle with
approximately 1.5dB difference per position. No combina-
tion of settings of the rear panel switches can make the XA
2900 sound bad. Also note that it is acceptable to leave
them all in their middle position as this will give the flattest
balance in a very good room with very neutral electronics.
We just feel that, with a little patience and experimenta-
tion, that an even better performance is achievable in most
case with judicious adjustment of the various controls.
The Boundry Switch allows you to adjust the bass
response of the low frequency range below 400 Hz to
compensate for the effect room placement has on bass
response. When the XA2500 is located at least 12 inched
(30cm) away from the surrounding walls use the upper
“Free Space” switch position. If the XA 2500 is placed
against a wall but at least 12 inches off the floor use the
middle “Rear Boundry” switch postion. When the XA 2500
is placed on the floor and against a wall use the lower
“Floor Placment” switch postion.
These recommendations are only a starting point. Listening
test should be used to determine if the initial switch setting
is the best choice. Listen to music that has a wide range of
sounds along with a strong bass component. If bass range
sounds or male voices sound “thick” or “tubby” try using a
lower Boundry switch setting. Do not set the Boundry switch
to a higher than necessary position in an attempt to achieve
“impressive” sounding bass. This will produce an unnatural
balance that will mask higher parts of teh sound range.
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The Midrange Switch affects the upper harmonics of
human voice, especially vowel sounds like “i” and “eh”.
Again, listen and choose which of the 3 positions seems
most neutral.
Next switch up the spectrum would be for lower treble .
Excesses here give hardness to the character, whereas
absences lend “sweetness”. Some electronics and source
components can add harness to the chain and could be
compensated with the lower position. The upper position
might be used if the room’s acoustics are particularly dull.
The topmost spectrum adjustment is for the upper treble .
This range gives sparkle to the sound and contains the
highest harmonics of instruments, especially percussion
instrument as well as the bite of some brass instruments.
All of the adjustments can be usefully employed to
compensate for room acoustic issues. Also your listening
distance might have some bearing. Close listening distances
might warrant some reductions of the top two controls to
prevent the system from sounding overbearing. At greater
listening distances the same controls can offset the distant
perspective that naturally occurs.