AXXENT Universal Induction Loop Amplifier ISV1090 / RINGLEIDING 

New Induction Loop Amplifier ISV1090 i.e. Loop Amplifier with 90° Phase Shifter

The induction loop amplifier with model designation ISV1090 is a brand new development of axxent. These type of amplifiers drive induction cable loops installed on the room floor or ceilings. The loops generate an induction field that can be picked up by so called t-coils of hearing aids. A majority of hearing aids have these reception coils built in.

The new axxent model allows switching the output current in four stages by setting internal jumpers. This flexibility eliminates the need of several types of amplifier models for each size of room. The ISV1090 not only drives simple room perimeter cable loops, but, it may be used for the installation of so-called low spill-over loops. These multi-segmented loops are required for critical applications such as conference rooms, multiplex cinemas, etc., where the induction sound signal should not stray outside the room and interfere with the induction signal in a neighboring room.

To install a low-spillover induction loop, an ISV1090 is defined as Master with a phase shifter module PSM90 plugged in, drives a first multi-segment loop, connects to second ISV1090 in Slave mode, 90° phase shifted. The Slave ISV1090 drives the second multi-segment loop cable installed above the first, slightly shifted.

The new Induction Loop Amplifier ISV1090 is available immediately, as well as the Phase Shifter Module PSM90.

ISV1090 / RINGLEIDING 
Universal Induction Loop Amplifier

The loop amplifier ISV1090 is a newly developed product made by axxent. This type of amplifier powers induction loops inside rooms – either in the floor or in ceilings. This induces an induction into the air between the outer borders of the cable loops. Reception loops are built into most hearing aids.

The audio signal from the induction loops is drastically better for the hearing impaired than the purely acoustic signal. This is because of the broad frequency spectrum fed into the loop, without room reflections, plus the compression used in the amplifier that enables the hearing impaired to hear low level music or speech

The ISV1090 not only is a universal loop amplifier for almost all room sizes (jumpers inside to adjust to four different power outputs), but has three possible operation modes: Single unit use, coupled with another unit to feed multiple loops and mixing all inputs and the use with another unit in Master/Slave mode to feed socalled low spill-over loops. The latter needs to plug in a 90° phase shifter module into the master unit.

Features
• For induction loops of various room sizes, jumpers inside may be configured:

• Up to 1,000 sqm, 8.8 A rms, 12.7 A peak power
• 6.7 A rms (good for approx. 500 sqm)
• 4.3 A rms (up to ca. 200 sqm) = pre-installed
• 3 A rms (to approx.. 100 sqm)

• 2 balanced xlr-microphone inputs
• 48 v microphone phantom voltage singly switchable
•Xlr line input
• Line input with Euroblock connector and 24 vdc to feed external mic/line pre-amplifiers
• Built-in compressor
• Metal loss correction potentiometer
• Drive potentiometer
• 3.5 mm phone connector for headphone monitoring
•All potentiometer knobs may be removed and covered by blinds to avoid mis-adjustment by unqualified users
• IEC power connector with 2 A fuse, slow blow.
• Noise-less operation without fan
• Internal socket to plug in a 90° phase shifter module PSM90
• Phase shifter module PSM90 may be obtained from axxent
• Internal jumper array for various operation modes from A to G:
• Single – induction loop amplifier acting as a standalone unit (A or B)
• Master – induction loop amplifier with another unit as SLAVE and inserted 90° phase shifter module into the master unit (C, D or E)
• Slave – amplifier connected to the master unit (F or G)
• Phone jack 6.3 mm for amplifier coupling.
• Amplifiers may be used in parallel mode also. This also allows to mix the inputs of all amplifiers.
• All operation modes are explained in the user manual in detail. Adjustments of the operation modes are
made by inserting/removal of internal jumpers.
• LED operation mode indication master/slave
• LED indication of compression
• LED indication of power output
• LED indication of operation temperature
• LED indication of power-on

Technical Comments
The axxent induction loop amplifier ISV1090 may drive induction loops within an impedance range between approximately 0.3 to 2.5 ohms with full power.

Please note that at full power more than 12 A current drives the wire loop. A direct short of the wire loop must be avoided. Length of the wire loop should be planned according to planning tables available and it should be measured by an impedance meter. Induction loop wire should be only one single core stranded. An alternative is to use self-adhesive copper foil, which is of advantage when a loop should be below carpet or similar – mostly only 1 mm thick and unobtrusive.

The ISV1090 features detachable rack-ears for its use as a table top amplifier. Rubber feet facilitate this use also. The housing is made of solid steel, powder coated.

Size:
434 mm W (w/o rack ears), 190 mm D (including potentiometer knobs and connectors), 44 mm H (w/o rubber feet).

Weight:
3.6 kgs net, shipping 5.6 kgs.

Technical data subject to change without notice.