?? Altec bolted these to the 511B crossed at 500-800Hz/2nd order or to the 811B for 800-1200Hz/2nd order, no adapters required. WRT using adapters, unless the joints are seamless they add another discontinuity to cause HF reflections back to the throat, so unless you have a specific lens you need for your app I recommend using the ones they were designed for and damp them to suit (at least the bells).
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