Ivan Beaver wrote on Fri, 16 October 2009 20:14 |
Is it me or does the HF horn look to have a much wider pattern than the low freq side? |
Art Welter wrote on Thu, 15 October 2009 17:34 |
Craig, I used to have low mid horns similar to yours with EVM 12". A pair per side kicked down to the 60-80 HZ range, on some country gigs I actually ran them without any subs. How are the low mid horns damped? What is the compression chamber size? Have you tried flipping half the cabinets over (coupling the HF) to reduce the width of the stack and reduce comb filtering problems that may be causing a lack of lower low mid? Art Welter |
Art Welter wrote on Sat, 17 October 2009 09:29 |
Craig, When I asked how are the low mid horns damped, I was wondering about the actual horn, not the compression chamber. |
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On the fiberglass horns I made, we laminated Built-rite, a kind of wood fiber insulation material to the horn, then filled the chambers with expandable foam. That treatment increased both the level and quality of the low end. |
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The DL12X is about 5 dB hotter at 400 HZ than at 100, it takes a fair amount of EQ to get them flat even in a front loaded cabinet. You may be mistaking the usual slanted horn response for a lack of 100-130 HZ. |
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Xmax is 4.1 MM, even without an additional "donut" if you are hitting the cone and have about 1/4" clearance you are over Xmax. |
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You should experiment with the rear chamber size, you may find that a smaller compression chamber will work better. Loading styrofoam "bricks" into the compression chamber is an easy way to test, keep loading more until the LF/excursion does not improve. |
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Have fun! |
Art Welter wrote on Mon, 19 October 2009 14:14 |
Who is the designer / builder? |
Craig Hauber wrote on Sun, 25 October 2009 21:38 | ||
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. |
Elliot Thompson wrote on Sun, 25 October 2009 23:21 |
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, |