Jack 15 is a Jack of All Trades speaker line: small, versatile, light
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It can be built as an old-school woofer only electric bass cab.
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It can be built as a modern full range bass or keyboard cab. It cab be built with one or two woofers.
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It can be used as a PA top along with subs, it can be used as a full range PA without subs.
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It can be outfitted with a 120 degree dispersion melded tweeter array, or a vertically aligned compression driver loaded high frequency diffraction horn.
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It can be used one per side for small room PA needs, it can be vertically stacked in a line array for thousand seat venues.
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If maximum versatility is what you need from a speaker of minimum size and weight, not to mention cost, Jack 12 is the cab you want.
Complete details and plans are available from 
Specifications
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Dispersion with Piezo melded arrays: 120 degrees
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Dispersion with Diffraction Comp Horn: 100 Degrees
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Power handling: Driver dependent. See options in drop down box for driver selection
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Response: 60-18k
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Dimensions: 20in x 21in x 23in
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Weight: Approx 55-65lbs, dependent on driver and hardware.
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Jack15 Lite Weight: Approx 45-50lbs, dependent on driver and hardware.
Kit Contents
Jack 15 DIY Speaker Deluxe Kit:
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Choose from 5 Eminence Speakers
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Goldwood GT1016 piezo tweeters
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All crossover parts, or prebuilt by SpeakerHardware Technicians
Response Graphs
Jack 15 Compression Driver 
