Programmer 7500/MAX_PROGRAMMERS.iso/PROGRAMS/UTILS/HAMRADIO/BOUNDRY.ZIP/BOUNDRY.DOC

Text File | 1990-01-11 | 3.7 KB | 69 lines

Documentation for BOUNDRY.

One of the most difficult problems faced by the audiophile/music lover is
the placement of the loudspeakers within the listening environment.  Even
professional room equalization, done by some retailers for the benifit of
customers who spend a bundle, does not guarantee proper positioning.  Indeed,
equalization should not be performed until AFTER the speakers are properly
placed, if at all.

The effects of the room boundries on loudspeaker performance have been known
for many years.  Although the multitude of peaks and dips due to room
reflections cannot be avoided, irregular response in the EARLY ARRIVING SIGNALS
can be minimized with proper speaker placement.  BOUNDRY provides a graphical
display showing the effects of the room boundries on the response curve.  This
curve represents the low and mid-frequency response of a theoretically flat
loudspeaker when adjusted for the effects of four nearby room boundries; the
floor, ceiling, side wall and rear wall.  A small shift in speaker positioning
can often provide a dramatic improvement.

When using the program, note that no amount of adjustment will have an effect
on the rising response at the lowest frequencies for an average listening room.
Also, it would be difficult, if not impossible, to remove dips and peaks whose
amplitudes are less than +5 or -5 from the 0 db line.  The default variables
for Speaker-to-floor, Speaker-to-side-wall and Speaker-to-rear-wall provide
a curve which should be considered acceptable.  Wide, deep dips should be your
prime targets.

Naturally, there are other considerations when placing your speakers and these
will provide a starting point from which you can make adjustments with this
software.

All prompts are self explanatory and you should have no problems running this
program without a "manual".

REGISTRATION of this shareware progam is not necessary nor expected.  However,
there are a number of benefits in doing so.  The most important of these is
the receipt of LISTENING ROOM, a program which will allow you to adjust your
loudspeakers/listening position in order to minimize the effects of STANDING
WAVES in the listening environment.  Of the two problems, boundry reflections
and standing waves, standing waves can have the most detrimental effects on
your listening pleasure.  Not only do standing waves alter the perceived
frequency response of your system, they can increase it's TRANSIENT DECAY TIME.
Listening locations which are in standing wave "hot spots" can completely ruin
the enjoyment of an otherwise excellent and well thought out sound system.

Not only does registration provide you with the LISTENING ROOM program, you
also receive a version of BOUNDRY which you can run from a batch file.  When
run from a batch file and by passing listening room variables to the program
on the command line, you can sequentially display (or print) the many curves
which result from ANY range of parameters.   Also included is a small editor
designed specifically for writing batch files.  This little editor, called
Ed-A-Bat, is what the DOS EDLIN program should have been and, even if you never
use EDLIN, you will want to rename Ed-A-Bat to EDLIN and place it in your
utility or DOS directory.  After this, you will find plenty of uses for EDLIN.

LISTENING ROOM used in concert with BOUNDRY, will provide audiophiles and non-
audiophiles alike, with the tools necessary to fine tune their systems and
experience increased listening pleasure.

To register BOUNDRY and receive LISTENING ROOM, the batch file version of
BOUNDRY and Ed-A-Bat, send $45 to:

Bill Fitzpatrick
POBox 282
Veneta, OR  97487
[phone]