INTRODUCTION
Thank you for purchasing ISP Technologies HIGH DEFINITION LINE HDL3112 speaker
system. The HDL 3112 is a high output three-way active speaker system designed to
deliver HI-FI sound quality for medium and high SPL sound reinforcement applications.
The HDL 3112 is a single element line array cabinet available in two maximum vertical
coverage angles, either 8 degree or 15 degree, with adjustable splay angles. The driver
complement is one 12-inch high efficiency neodymium woofer, one 3-inch voice coil
neodymium midrange compression driver, and three 1.75-inch polyester
diaphragm neodymium high frequency compression drivers. The HDL 3112 has three
separate power amplifiers capable of producing upwards of 800 watts of RMS power, and
an internal active analog crossover. The internal amplifiers are based on ISP
Technologies patented D-CAT™ (Dynamic Current Amplifier Technology) amplifier. The
D-CAT technology is capable of delivering high output current providing an improvement
in transient response and a noticeable improvement in
PUNCH
. The D-CAT amplifiers
provide improved reliability by including short circuit and over temperature protection.
The built-in crossover is aligned so that a single box provides nominally flat response
from 100 Hz to 17 KHz, when a signal is input to the full-range XLR input, and the rear
panel switch is set to the Full Range position. An external high-pass filter is needed at
70 Hz or higher. This may be supplied by driving the box with the high-pass output
from an ISP powered subwoofer, or an external processor. When using multiple boxes,
an external processor or equalizer must be used to provide an array EQ function, which
rolls off the lower frequencies and boosts the high frequencies. The amount of this
spectral tilt is dependent upon the number of boxes used and the splay angles between
them. Higher splay angles create more high frequency divergence, which requires more
HF boost. For improved performance and controllability, an external processor can be
used to provide a 3-way crossover for the box, feeding each band separately via the
rear-panel ethercon connector. The rear panel switch must be set to the 'Three-way'
input position, which also disables the level control knob. Feeding signal to the box this
way allows the use of digital alignment delay on the woofer, which slightly improves the
horizontal response. ISP can supply the purchaser with recommended processor
settings for both the Full Range and 3-way uses. In the 3-way input use, there is still
significant internal high-pass filtering occurring so that accidental swapping of signal
lines at the ethercon fan-out should not damage the HF or MF drivers.
LineCalc112 Software, which is an Excel spreadsheet, is available to aid in aiming the
boxes and predicting SPL levels in a venue.
The HDL 3112 cabinet is made of high quality 13 ply Baltic birch plywood with a durable
spray on black splatter polyurea finish for long life.
SUSPENDING LOUDSPEAKERS
Important Notice!!!
The information in this section has been gathered from engineering data and is for
informational purposes only. None of the information in this section should be used
without first obtaining competent advice with respect to applicability to a given
Summary of Contents for HDL3112 ACTIVE SERIES
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