Bag End ISUB2-18

The ISUB2-18 is a self powered professional subwoofer system. It employs stereo summing management combining Two inputs for a mono summed bass system.

The signal is processed by the INFRA dual integrator driving a 700 watt power amplifier into a front firing 18" cone loudspeaker in a sealed box. This provides a flat acoustical response down as low as 8 Hertz. Two iso- lated inputs allow the combining of a stereo signal for mono summed bass. Two units can be used separately for stereo bass systems.

The internally set Dynamic Filter protection maintains undistorted audio reproduction under accidental overload conditions. An optional remote indicator module may be placed in a convenient visible location to indi- cate the dynamic filter protection threshold has been reached.

INFRATM TECHNOLOGY DESCRIPTION: The INFRA driver is operated below resonance and flattened with an electrical boosting circuit, the INFRA dual integrator. Operating below resonance the INFRA system exhibits predictable, uniform response and reproduces each note with the same emphasis, reducing the influence of the res- onances found in conventional above reso- nance bass systems. In addition, the use of a low pass filter is eliminated (and with it the associated long variable delay) and replaced with the INFRA dual integrator with its short uniform delay.

Upon close listening, it is clear that the impression of power and impact is greater with an INFRA system when compared to conventional bass systems. This is true even when the two systems will measure the exact same Sound Pressure Level on a calibrated SPL meter. This is because the INFRA subwoofer maintains the bass energy in a tight packet, aligned with the upper range signal, providing a greater body impact and a seamless musical connection with the main loud- speakers.

Objectively, the INFRA system exhibits superior frequency and phase response.

DYNAMIC FILTER: The Dynamic Filter circuit is a complimentary technology to the INFRA dual integrator. It insures that unexpectedly large signals will not overload the system resulting in possible damage or audible distortion. This allows high level operation close to the maximum system capabilities without fear of accidental overload.

The Dynamic Filter circuit dynamically reduces the bass extension to prevent over- load. It is inherent in the INFRA design that an overload condition will occur with the low- est notes first, as they require the greatest amount of amplifier power and driver excur- sion. In an overload condition, the Dynamic Filter circuit will reduce the lowest frequen- cies to their maximum safe level while not affecting the bass content above the fre- quency that exceeded the threshold.

• Single 18" Infra Subwoofer System

• Self Powered, Self Infra Processor with 5.1 Bass Management

• Configured For Studio Installation Applications

• Black Textured Finish or High Gloss Automotive Finish (shown)

• 22"h x 21"w x 18"d, 75 Lbs

INPUT CONFIGURATION:

2 Isolated Balanced XLR

female line level

INPUT MODE:

2 Summing inputs

INFRA MODULE:

8 Hz dual integrator

INFRA FREQUENCY RESPONSE:

±3 dB 8 Hz to 95 Hz (2p Steradians)

INFRA system -6 dB frequency 95 Hz

(not adjustable)

INFRA LEVEL CONTROL:

Adjustable level

INFRA CUTOFF FREQUENCY:

Internally set 8 Hz or 16 Hz

INFRA OVERLOAD PROTECTION:

Preset threshold Dynamic Filter circuitry

INFRA POLARITY:

± Push button switch

RTI:

Optional Remote Threshold Indicator

Threshold exceeded indication red LED

AMPLIFIER OUTPUT POWER:

700 Watts continuous sine wave

LOW FREQUENCY TRANSDUCER:

EL-18R 18" Cone

ENCLOSURE:

13 ply birch plywood

AC Power Requirements

Auto sensing 100 to 250 VAC

FINISH:

Black textured finish or

optional high gloss automotive finish

Grille: Black nylon cloth on frame

DIMENSIONS:

22"h x 21"w x 18"d

55.8cm x 53.3cm x 45.7cm

WEIGHT:

75lbs - 34kg

APPLICATIONS:

• Recording Studio

• Mastering Lab

• Professional Surround Systems

• Screening Rooms

• Discriminating Home Theater