Yamamoto YS-500

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you could make a similar system that is better. The Alpha 15A is only usable untill 5-600Hz, so you will have to pair it with a tweeter and horn that can go low and with a higher order crossover. Or find an other driver that has a high QTS (to be usable in OB) that goes higher. This deltalite is not really ideal for an OB.
 
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Yes, it is a 15 inch. Not ideal, but in my room placed near a corner, they are quite flat down to below 40 Hz. I see the problem in the design with the non-matched directivity. I bought these for half the price of the drivers and they will be most probably butchered at some point of time.
 
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These boxes are now sitting in the corners, not being used, which is a shame. However, a pair of ESS Heil AMTs is on its way to me...and I think that the woofers should be a quite good match. The AMTs could be placed on the top or maybe event in place of the horns with a small sub-baffle. And the DE500s can find some use elsewhere.
 
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