Craig Hauber wrote on Sun, 25 October 2009 21:38 |
Art Welter wrote on Mon, 19 October 2009 14:14 |
Who is the designer / builder?
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Not sure, the only label on them is "harbinger" and I don't know if thats a builder, owner (or both) but searching that name brings up nothing related except for a cheap chinese speaker brand.
Here's the compression chamber showing the "phase plug" The opening above is just a tilt-handle and access into the upper portion of the box which contains the 2" and horn only.
It is roughly 2.4 cu ft (not including driver volume) and I put a batt of 3" fiberglass in there.
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With a depth of 30-inches, they are probably 180-200 Hz horns and, lose their efficiency rapidly under 200 Hertz. Since the cabinet is sealed any means of bass extension is eliminated.
You also have Electrovoice DL 12X that cannot deliver a lot of mid bass without excessive cone movement. The EV DL 12X is actually the old EVM 12L (Lead Guitar) designed to handle more wattage.
Those are two major obstacles that will prevent you from achieving anything under 200 Hertz with high efficiency. You would need to redesign the cabinets and replace those EV drivers with woofers (The EV DL 12X are Lead Speakers) for a lot of mid-bass ranging from 180 – 90 Hertz. Two EV DL 12X sitting in a 2.4 sealed cubic box will give you a –3 dB @ 174.3 Hz.
If you want to stick some cabinets in between, you can go to
www.speakerplans.com and, build a few
HD 15s. I am not sure if you are looking to create such a configuration in terms of cabinets. However, the harsh reality is those cabinets are midrange cabinets despite looking as if they can deliver a lot of low-midrange/mid-bass.
Best Regards,