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Message: <blockquote data-quote="leonsv" data-source="post: 2717804" data-attributes="member: 570127">this section of the review by npdang over at diyma should give you some idea"7” mid/bass: Seas RNX drivers – Comes in many flavors, but are essentially the same driver. The /p in the model# refers to a phaseplug. Model #’s are P for poly, L for aluminum, G for fiberglass, CA for paper. For example L18rnx/p refers to an aluminum cone with phaseplug. Poly – Unlike Dynaudio for example, the Seas poly cone is a pure poly cone and unblended with mica or any other stiffening elements (IIRC). This yields a very well dampened cone that provides a smooth frequency and extremely forgiving nature at the expense of detail. Special note, the P18rnx/p is the only model to use the latest “adaptive surround” which is used on Seas higher end Excel drivers. The adaptive surround provides greater dampening at higher frequencies for a smoother response, and less dampening in the lower frequencies. Aluminum – Provides the best detail retrieval, but has significant upper end breakup which should be attenuated to reduce coloration and distortion. Can be a difficult driver to work with, and should ideally be used below 2khz necessitating a high performance tweeter. Fiberglass – This is the best compromise between detail and warmth. Robust sounding, but not overly laid back or heavy. Has excellent top end extension that will mate easily to any tweeter and requiring very little filtering up top. The only downside is that this unit has been discontinued and could be hard to find. Solen.ca usually has some stock. Paper – A very warm, smooth, robust sounding midrange. Generally considered the most neutral sounding driver of the three, although detail retrieval is nearly as bad as the poly cone. Definitely has more character and presence than the poly. Good top end extension means this driver mates quite easily to any number of compact tweeters."</blockquote>

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