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Multi-Way Conventional loudspeakers with crossovers

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Old 10th October 2013, 04:34 AM   #1
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Join Date: Mar 2012
Location: Rural Isaan
Default Sometimes sow's ear is good enough

Been hauling the 811's and 414's around for long enough. No tools here in Thailand, so had a local shop make them with their finish. Used the same design back in USA. This time scrapped the OEM crosses and used Minidsp's minidsp/miniamp stack. One in each cab. Although perhaps world's worst room (cement and tile over cement) I get good response down to 35Hz and up to around 13Khz.
BTW the purple stuff used for horn gasket and "spikes" is backpacker foam pad. Works good for dampening too.
Final adjustment made with REW and Umik-1, using REW sig gen to manually sweep 25Hz.-600Hz. and equal level by ear.
Good enough!
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Old 10th October 2013, 08:37 AM   #2
ODougbo is offline ODougbo  United States
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Impressive! What's the grill on the bottom - vent ports?
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Old 10th October 2013, 08:46 AM   #3
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Thanks @ODougbo. Yeah, 150x300mm ports. I wanted ports protected to keep my cats out.
BTW 160 liter inside volume, made from mdf with moderate bracing and no dampening inside. I get nothing but bass out of the port because the horn keeps everything else going out the front. I have dampened the horn with a couple mm of automotive undercoating. This really helped.
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Old 10th October 2013, 09:47 AM   #4
ODougbo is offline ODougbo  United States
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CAT!! just turn them on (-; (-;
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Old 10th October 2013, 01:47 PM   #5
fpitas is offline fpitas  United States
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Interesting twist on the 811s (pun intended). I guess you wanted wide vertical dispersion and narrow horizontal?
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Old 10th October 2013, 02:08 PM   #6
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@fpitas, hahaha, not that technical in this case. I only wanted a more narrow front. Wide speakers are an awkward fit in the last few spaces I've had available. I haven't noticed and real problems with width of dispersion. Works out nice as they are easily done with 2 sheets and bracing material to spare.
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Old 10th October 2013, 02:35 PM   #7
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Why do I look at that horn and see a 511?
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Old 10th October 2013, 02:37 PM   #8
fpitas is offline fpitas  United States
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It does look a bit big for an 811, doesn't it? How big are those horns at the flange, Hawaiiman?
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Old 10th October 2013, 04:14 PM   #9
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I'm embarrassed, but in measuring them, they are indeed 511's. Good eye Cal!
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Old 11th October 2013, 07:37 AM   #10
Stuey is offline Stuey  Australia
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Cat = extra dampening...
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