You only can use spades on them. I had a pr so I know.
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I think the Firebirds are very nicely made speakers but the xovers were terrible. So I had new xovers made, costed me like $4-5K. The parts alone was like $3K. It was done by a professional speaker maker off course. Then they were amazing. My local audiophile buddy love them so much he asked me to sell them to him. I had the diamond tweeters also. Persnoally I felt that they need a lot of power to open up so no tube amps. Have fun.