Ashly Electronic Amplifier none - Manual (Page 8)

NORMAL SETUP GUIDELINES
Speaker Placement
In order for you to obtain maximum benefit from your crossover, a correctly
assembled speaker array is a necessity. Low frequency speakers should be
grouped as closely together as possible and mid and high frequency horns
should be stacked on top of one another, not side by side. This arrangement
insures a tight vertical pattern combined with wide horizontal dispersion
free from high frequency lobing. Speakers in the array should be arranged so
the drivers and cones are all in the same plane (equal distance from the
1i stener).
Phasi ng
It is unnecessary to reverse the polarity of any of the outputs of an Ashly
crossover, as all necessary inversions have been done internally. Simply
stack your speakers and wire positive to positive, negative to negative on all
outputs.
With the multitude of different brand amplifiers and speakers used together,
phasing of all components of multi-band systems can be very confusing. Only
extreme care in the hookup of these components will insure proper phasing. It
is important not only to keep all the speakers within each band in phase with
each other but to keep all bands of the system in phase as well. If this is
not done, loss of level and pattern control at the crossover frequency will
result.
Phase of cone speakers can be checked by connecting a 1.5 Volt battery to the
speaker and observing which way the cone moves. The most common convention is
that (+) voltage on the (+) terminal moves the cone forward. A notable
exception to this convention is JBL. A {+) voltage on the red terminal of a
JBL speaker moves the cone backward. If all your speakers are the same brand,
just connect them all the same way; if not, it's best to test. Unfortunately,
compression drivers cannot be tested this way. We do know that Altec, Emilar,
and Electrovoice agree and that JBL is reversed from their standard.
Most power amplifiers have their output in-phase with the input and it is
generally not a problem to mix brands.
CONNECTIONS FOR NORMAL OPERATION
Connecting a crossover to your system is straightforward if you are using it
in its normal configuration—the output of your mixer connects to the input of
the crossover and the outputs are connected to appropriate power amplifiers as
shown in figure 3.