Might as well try one more post.

Does anyone know the difference in the frequence performance of a 515 phenoic spider woofer versus a normal 515B. I?m told the 515 is better at midrange than the 515B but no one has indicated the differences in frequency terms.

My 515?s are gold label, not ?red, white, and blue? ? not sure what the difference is?

Any datasheets?

Jack