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EM Acoustics i-8 User Manual

I series compound isobaric subwoofers
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i-Series Subwoofers
User Manual – v3.0
i-8 compact compound isobaric subwoofer
i-12 compound isobaric ULF subwoofer
EM Acoustics Loudspeakers
Building 74, Dunsfold Park
Cranleigh, Surrey
GU6 8TB, UK
Phone +44 (0) 1483 266520
Fax +44 (0) 1483 275619
www.emacoustics.co.uk
_________________________________________________________________________________________
Copyright EM Acoustics 2010
1
i-Series Subwoofers User Manual
www.emacoustics.co.uk

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Summary of Contents for EM Acoustics i-8

  • Page 1 Subwoofers User Manual – v3.0 i-8 compact compound isobaric subwoofer i-12 compound isobaric ULF subwoofer EM Acoustics Loudspeakers Building 74, Dunsfold Park Cranleigh, Surrey GU6 8TB, UK Phone +44 (0) 1483 266520 Fax +44 (0) 1483 275619 www.emacoustics.co.uk _________________________________________________________________________________________...

  • Page 2: Table Of Contents

    Permanent Installations Page 9 Maintenance Page 10 Warranty Page 12 Appendix A – Technical Specifications Page 13 THIS MANUAL HAS BEEN UPDATED TO APPLY TO ALL i-12 SUBWOOFERS, and i-8 SUBWOOFERS FROM SERIAL NUMBER i8071112/001 ONWARDS. i-Series Subwoofers User Manual www.emacoustics.co.uk...

  • Page 3: Thank You

    Unpacking Every EM Acoustics product is built to the highest standard and thoroughly tested before it leaves our factory. After unpacking your loudspeaker, please inspect it carefully for any signs of transit damage. If such damage is found, please notify the carrier at once to instigate a claim.

  • Page 4: Product Overview

    Consequently, the i-8 has a frequency response down to 35Hz yet is small enough to be concealed underneath sofas or in small wall cavities. The i-8 - although small in size – has enough SPL output to be of use for nightclub or corporate applications, and even for small FOH systems underneath EMS-81 enclosures.
  • Page 5 ULF subwoofer The i-12 is the bigger brother of the i-8, and utilises the same enclosure technology. Four high power, long excursion 12” (305mm) drive units are contained within the compact enclosure, again arranged in a compound isobaric format.

  • Page 6: System Set-Up

    Loudspeaker systems are potentially dangerous objects if used incorrectly. Please ensure that you read this section fully, and contact EM Acoustics or your local dealer should you be in any doubt over correct operation procedures. Professional loudspeaker systems are capable of producing damage-inducing sound pressure levels, and hence care should be taken when setting your system up, particularly when it comes to loudspeaker placement within a venue.

  • Page 7: I-12 Impedance Selection

    Cabling i-8 & i-12 subwoofers are supplied with Neutrik Speakon NL4 connectors, wired on pins 1+/1-. The 2+/2- pins are connected to allow link-through with four core cables (also for use on the i-12 in dual-channel mode – see page 8 for details). It is recommended that the resistance of your cable is less than one tenth of the nominal system impedance.

  • Page 8: Processing

    (and excessive high frequency will damage your subwoofers) and high pass filters are recommended to protect the drive units from over-excursion. i-8 subwoofer: It is recommended that a high pass filter at 35Hz is used for moderate-to-high SPL applications to prevent the drive units from over-excursion.

  • Page 9: Mounting & Rigging Options

    Rigging Hardware & Accessories The i-8 contains sixteen M10 threaded fixings around the enclosure, to enable suspension using forged shoulder eyebolts with a minimum thread length of 20mm. With any suspension method, a second anchor point should be used as a safety.

  • Page 10: Maintenance

    MAINTENANCE Your EM Acoustics loudspeakers have been rigorously tested before they leave our factory, to ensure that they give you a lifetime of flawless operation. Should any of your drive units fail and need replacing, please follow the guidelines below.
  • Page 11 i-12: Front Low Frequency Drive Units 1. Carefully remove the foam from the grilles – it is held in place with Velcro fasteners. Using a No.2 Pozidrive screwdriver, undo the Pozidrive screws holding each grille in place, then remove the grilles to gain access to the drive units.

  • Page 12: Warranty

    Serial numbers must be quoted in all correspondence relating to the claim. EM Acoustics or its representatives are in no way liable for any loss or damage in transit, and hence it is recommended that the sender insure the shipment.

  • Page 13: Appendix A - Technical Specifications

    APPENDIX A – TECHNICAL SPECIFICATIONS EM Acoustics operates a continuous process of research and development, and as such reserves the right to alter specifications without notice. Enclosure Type: compound isobaric subwoofer Dimensions (HxWxD, mm/ins): 308/12.1 x 530/20.9 x 450/17.7 Net Weight:...
  • Page 14 i-12 Enclosure Type: compound isobaric subwoofer Dimensions (HxWxD, mm/ins): 420/16.5 x 823/32.3 x 700/27.6 Net Weight: 83kg Frequency Response (+/- 3dB): 27Hz – 100Hz Sensitivity: 93dB, 1W/1m Drive Units: 4 x 12” (305mm) LF cone drive units Power Handling: 1000W RMS, 2000W Program Maximum SPL: 128dB continuous, 136dB peak Nominal Impedance:...

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