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Building an effective, high performances, dual 15” front loaded subwoofer

Eighteen Sound A division of A.E.B srl Via dell'Industria 20 - 45025 Cavriago (Reggio Emilia)- Italy

2x15” subwoofer kit
•High performance 2 x 15 inch subwoofer system •Side by side push/pull woofer arrangement to balance the motion mechanical non linearity allowing a significant reduction indistortion •Double driver choice is possible: 15ND930 allows for lightweight box and faster attack sound character. The 15LW1500 could be the choice if deeper bass extension and extra 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” interleavedsandwich voice coil Double Silicon Spider Double Demodulating Rings Rubber Surround 1000W continuous pink noise

2x15” subwoofer kit
15ND930

15LW1500

2x15” subwoofer kit
•The enclosure should be made of baltic birch plywood (18mm thickness). •Bolts should be M5 or M6, 35mm or more length. •M5 or M6 T-Nuts are recommended. •Accurate damping of the cabinet interior 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 at user’s choice. It’s very important that their placement should not influence in any way the proper vent functionality.

Internal view

2x15” subwoofer kit

Exploded view

2x15” subwoofer kit
Front view

2x15” subwoofer kit
Frontpanel: bolts holes

2x15” subwoofer kit
Front section

Woofer panel section

2x15” subwoofer kit
Side section

Inside woofer section

2x15” subwoofer kit
Side section

Outside woofer section

2x15” subwoofer kit
Bracing detail

Part G

2x15” subwoofer kit
Rear panel

2x15” subwoofer kit
Measurements: 15LW1500

2x15” subwoofer kit
Measurements: 15ND930

2x15”subwoofer kit
Equalization settings suggestions

2x15LW1500 High pass: Butterworth 2nd order @ 25 Hz Parametric EQ: fo= 35 Hz - gain= 6 dB - Q= 2 fo= Low pass: Linkwitz/Riley 4th order @ 120 Hz Linkwitz/Riley

2x15ND930 High pass: Butterworth 2nd order @ 25 Hz Parametric EQ: fo= 36 Hz - gain= 6 dB - Q= 2 fo= Low pass: Linkwitz/Riley 4th order @ 120 Hz Linkwitz/Riley

Building aneffective, high performances, single 18”, front loaded subwoofer

Eighteen Sound A division of A.E.B srl Via dell'Industria 20 - 45025 Cavriago (Reggio Emilia)- Italy

18” subwoofer kit
•High performance 18 inch subwoofer system. •Over damped design for better transient response. •Compact box dimension. •Flared end vent design for air turbulence reducing. •Internal bracing for cabinet loss reducing•Double driver choice is possible: 18ND9300 and 18LW1400 are basically the same speaker concept. Their performances are very similar except for a slightly more damping present in the 18ND9300. The 18ND9300 allows for a lighter weight box design. The “glorious” 18LW1400 can still represent the proper cost effective solution if same performances are required with less restrictive weight limits.•18ND9300 woofer key features: Neodymium magnet 4” interleaved sandwich voice coil Double Silicon Spider Double Demodulating Rings 900W continuous pink noise •18LW1400 woofer key features: 4” interleaved sandwich voice coil Double Silicon Spider Double Demodulating Rings 1000W continuous pink noise

18” subwoofer kit
18ND9300

18LW1400

18” subwoofer kit
•The enclosure should be made of balticbirch plywood (18mm thickness). •Bolts should be M5 or M6, 35mm or more length. •M5 or M6 T-Nuts are recommended. •Accurate damping of the cabinet interior 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 at user’s choice. It’s very important that their placement...