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Building an effective,

high performances, dual 15front loaded subwoofer

Eighteen SoundA division of A.E.B srl

Via dell'Industria 20 - 45025 Cavriago (Reggio Emilia)- Italy

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2x15 subwoofer kit

High performance 2 x 15 inch subwoofer system

Side by side push/pull woofer arrangement to balance themotion mechanical non linearity allowing a significantreduction in distortion

Double driver choice is possible: 15ND930 allows forlightweight box and faster attack sound character. The15LW1500 could be the choice if deeper bass extension andextra power handling capability are required.

15ND930 woofer key features:

Neodymium magnet

3 Edge-wound copper voice coil

Double Demodulating Rings

500W continuous pink noise

15LW1500 woofer key features:

4 interleaved sandwich voice coil

Double Silicon Spider

Double Demodulating Rings

Rubber Surround

1000W continuous pink noise

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15ND930

15LW1500

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Internal view

The enclosure should be made of balticbirch plywood (18mm thickness).

Bolts should be M5 or M6, 35mm ormore length.

M5 or M6 T-Nuts are recommended.

Accurate damping of the cabinetinterior is highly recommended.

An high density dampening material,such as Dacron or other synthetic fibers,is required for better performance.

Handling, rigging and connectors are atusers choice. Its very important thattheir placement should not influence inany way the proper vent functionality.

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Ex

plodedview

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Front view

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Front panel: bolts holes

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Front section

Woofer panel section

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Side section

Inside woofer section

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Side section

Outside woofer section

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Bracing detail

Part G

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Rear panel

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Measurements: 15LW1500

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Measurements: 15ND930

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Equalization settings suggestions

2x15LW15002x15LW1500

High pass:High pass: Butterworth 2nd order @ 25 HzButterworth 2nd order @ 25 Hz

Parametric EQ:Parametric EQ: fofo= 35 Hz= 35 Hz -- gain= 6 dBgain= 6 dB -- Q= 2Q= 2

Low pass:Low pass: LinkwitzLinkwitz/Riley 4th order @ 120 Hz/Riley 4th order @ 120 Hz

2x15ND9302x15ND930

High pass:High pass: Butterworth 2nd order @ 25 HzButterworth 2nd order @ 25 Hz

Parametric EQ:Parametric EQ: fofo= 36 Hz= 36 Hz -- gain= 6 dBgain= 6 dB -- Q= 2Q= 2

Low pass:Low pass: LinkwitzLinkwitz/Riley 4th order @ 120 Hz/Riley 4th order @ 120 Hz