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Building an effective,

high performances, 2 way15 loudspeaker system

Eighteen SoundA division of A.E.B srl

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

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2 way 15 kit

An effective, high performance and easy to build, twoway loudspeaker system for high performance in arelatively compact and portable enclosure.

An already optimized passive crossover networkgreatly simplifies the system setup.

The 15W700 woofer has been combined with theND1460 Neodymium Compression Driver, mounted ona XT1464 horn in order to obtain a smooth frequencyresponse, precision directivity control and high powerhandling.

Unique 18 Sound Elliptical-Spheroidal waveguidetechnology assures constant coverage at mid and highfrequency with precision and stability, and good array-ability if used in multiple units.

A crossover frequency set in the 1.5kHz range, yieldsvery good power handling and operation reliabilitywhile not sacrificing directivity control and mid-rangesound quality.

The 15ND830 woofer is the perfect option ifequivalent sonic performaces are required whilegreatly reducing system weight as well.

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2 way 15 kit

15W700 15ND830

ND1460

XT1464

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2 way 15 kit

The enclosure should be made out ofBaltic birch plywood (15mm thick).

The vents can be made with standardPVC plumbing pipe connections withinternal diameter of 96mm, as describedat page 13.

All the used bolts should be the M5 type(5mm diameter), 35mm deep. 8.8 steeltype or better is strongly suggested.

M5 T-Nuts are recommended to be usedin conjunction with M5 bolts.

Its strictly necessary to provide forproper cabinet internal acousticaldamping with absorptive material.

High density damping material, such asDacron or other synthetic fibers, isrequired for best performance.

The following example image show theproper damping material disposition.

Internal view and damping disposition

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Explodedview

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Front view

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2 way 15 kit

Front panel: bolts holes

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Side view

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Top view

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Top view section

Horn height section

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2 way 15 kit

Top view section

Woofer height section

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Back view

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2 way 15 kit

Vent

Plumbing pipe, 90 connection

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Crossover schematics

Components list

Type Value Note

Resistor 27 Ohm >20W

Capacitor 1.5uF 5% - >250V

Capacitor 8.2uF 5% - >250VInductor 0.47mH 250V

Inductor 1.8mH 250V

Inductor 0.56mH

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2 way 15 kit

Measurements: 15W700 + ND1460/XT1464

Beamwidth

0

20

40

60

80

100

120

140

630 800 1000 1250 1600 2000 2500 3150 4000 5000 6300 8000 10000 12500 16000

Horizontal Vertical

Deg

Hz

Directivity Index

0

5

10

15

20

25

30

630 800 1000 1250 1600 2000 2500 3150 4000 5000 6300 8000 10000 12500 16000

dB

Hz

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2 way 15 kit

Measurements: 15ND830 + ND1460/XT1464

Beamwidth

0

20

40

60

80

100

120

140

630 800 1000 1250 1600 2000 2500 3150 4000 5000 6300 8000 10000 12500 16000

Horizontal Vertical

Deg

Hz

Directivity Index

0

5

10

15

20

25

30

630 800 1000 1250 1600 2000 2500 3150 4000 5000 6300 8000 10000 12500 16000

dB

Hz

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2 way 15 kit

Horizontal polar response

Vertical polar response

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