The Eden XLT series (as all of their cabs) were simple tuned bass reflex cabinets. IIRC, the "D" was just naming thing for the David series, so named to take on SWR's 80's dominance with the Goliath cabinets and named after David Nordschow, Eden's owner/founder. I spoke with him. He's a very nice guy. I can attest to the massive rolloff below G and also that the XST series, which came out much later, did improve massively in lows and perform as advertised. Eden XLT cabs had an absolute TON of low mids and upper bass, which fooled quite a few people for a very long time. They also had the budget Nemesis line, which featured ultra-light cabs and 200 watt combos and were made overseas, when at that time, Eden amps were all made in the US. I have a Nemesis 8x10. The horn sounds terrible, but the rest of the cab is awesome.
They also cheated on the specs sheet for years and used a C-weighted signal (Peavey calls it "program power") to derive frequency response curves for the cabs so that folks wouldn't notice the 10-12 dB slope at 50 Hz with normal broadband signal. Anyone else remember the massive gear giveaways in
Bass Player magazine where it was always some megabuck boutique coffee table bass paired with an Eden rig? Eden was VERY smart in doing that. They were the undisputed kings of new bass amps for many years. Hell, even
I have an Eden,
but it doesn't really count because it's all tube and was made by Koch Electronics 
...but I would take an old s/s Eden ANY day (along with a host of other solid state bass amps.)
Mark, I second that. Old Ampeg plates are milled aluminum and pretty heavy. I'll bet they were sourced straight from Alcoa, which is about 60 miles from the Jefferson City Ampeg factory. Epoxy is good modern substitute.
