Carlspeak

Sorry, the presentation ran late and there was no listening session.

Here's a very nice presentation on DSD put together by one of the member of our CT. Audio Society. DSDSlideshow_130927.pdf

Send me a pic of the xover with additional close up of the back of the pots.

Good label. Enjoy the music.

You could first try cleaning those pots on the backside by spraying them with deoxit and rotating them back and forth soon after spraying.

I’d say that recording qualifies. Many true provenant recordings today are done using DSD. What was the label of that recording?

Provenance. The most important aspect of determination of a recording's origins. Most labels don't seem to want to share that information. Most audiophiles want it.

A look thru the AR drawing files for the AR9 8 inch would answer the question regarding the application of that bead of polymer.

Yup, that's it Stimpy. IIRC, that was AR's initial attempt at addressing cone edge breakup - long before the creation of the filleted foam.

Pete, I've done a few AR4x's with filleted foams. But no 9's that I can remember. Did the AR9 8 inch OEM woofer have the bead of polymer around the inner side of the roll?

Hue hand builds all of his woofers. I retrofitted one of his 8 inch models into a cabinet that had a similar, slightly over-size issue. I used a Dremel tool with a cylinder abrasive tool to hand grind the rabbet out to fit the new woofer. It just takes patience. I can't speak for the 10 inch working well in the AR though.

The Mundorf life spans quoted are for some pretty severe conditions. For example: 85 Deg C equates to 185 Deg. F. Not to worry

I fully agree. NPE's have gotten a bad rap, to the point where a huge bias against them now exists among restorers. That' s mostly due to the fact that NPE's are known to have a life of 15-30 years as opposed to permanent life for film caps. A new, good quality audio grade NPE will restore a speakers original voicing.

As you can see in Troels stacked experiments, mH values changed noticeably. I'd be much more concerned if the AR9 had stacked coils in the mid or HF circuits where your hearing is much more sensitive to.

http://www.troelsgravesen.dk/coils.htm