I'm sorry to say that your imagination has got the better of you. You are wrong on every count!
Originally Posted by Diminish
1. The M40/30 tweeters are not the model you list
2. The M40.1/M30.1 tweeters are not the model you list, nor are they from the cheaper SEAS Prestige series, they are, and have always been, from the top-of-the-line Excel series. It was only the recent introduction of a Prestige unit into another UK speaker design recently that alerted us to the existence of the Prestige line - but we're quite happy to pay for and receive the Excel quality.
3. The precise apertures and colour of the protective grille on several SEAS tweeters used by Harbeth is exclusive to Harbeth. SEAS send us the grilles in the natural metal state, a local powder-coating company a few miles from Harbeth powder-coat them by hand, we then send them back to SEAS in Norway and they fit to the tweeters and send the complete assembly to us
4. The M30/M30.1/C7ES3 most certainly do not 'share a crossover' - I just cannot imagine where this notion came from - the crossovers are designed for the speaker and are not interchangeable (wish they were, would make development and inventory control so much easier)
5. SEAS make dozens, perhaps hundreds of variants of their tweeters. Most of the detailed adjustments are buried inside the tweeter and would be undetectable to the layman. None are announced on their web site.
You are, in honesty, wasting your time scouring the SEAS website for information about the specialist tweeter variants that they make for us. OEM contract designs - like the ones we use - are never published.
Alan A. Shaw
Harbeth Audio UK