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Twin folded horn - what specs for drivers?

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Tom Johnson:
I have an ancient pair of Audio Centron subs, they are roughly 7ft long and weigh almost 300lbs each. I pulled the rear access panels off, and they had EV DL18-MT drivers inside, which desperately need to be reconed. I would like to get these things bumping again, and have been looking at replacement driver specs, but Iím not up to speed on what a twin folded horn needs. I see Rockville drivers for $60 each, which is less than the cost to recone the EVís. Iím looking at Emininence, SA, Dayton, and B52 Driverís on PE. What specs should I be looking for, to use these beasts in a mobile DJ / small band setup?

Paul G. OBrien:
Can you post up some pics so we can get an idea of what you have? For a real horn the driver specs will be quite specific so to prevent you from wasting a lot of time and money you need to provide as much into as possible. I see a lot of PA speakers with the AC brand on them but not very many subs and no horn subs so there is a real question is what you have is one of their products or a DIY effort.

Jeff Bankston:
you could use the specs for the EV driver and find another driver with specs that are as close as possible. This guy has many PA woofers.

http://www.electrovoice.com/binary/DL18MT_Woofer_EDS.pdf


http://www.usspeaker.com/18.htm



Scott Holtzman:

--- Quote from: Jeff Bankston on March 11, 2019, 02:20:07 am ---you could use the specs for the EV driver and find another driver with specs that are as close as possible. This guy has many PA woofers.

http://www.electrovoice.com/binary/DL18MT_Woofer_EDS.pdf


http://www.usspeaker.com/18.htm

--- End quote ---

You want the Theile Small parameters to be as matched as possible.  A horn is an acoustic waveguide and has an impedance curve.  If the driver doesn't perform the same you could get unloading (no pressure on back of speaker) and other bad outcomes.  High Pass filters are incredibly important in these enclosures.

I would pay most attention to the Cms Vas Impedance Xmax Sd SPL

Tom Johnson:
Here is a video I shot this morning before leaving for work. https://youtu.be/mW2AFYTe3Rs

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