Quote:Hi Steve,
I finally got around to installing into my Abbeys the DRF-65s you made for me over a year ago....I was re-motivated by a grandson toddler crunching the whizzer cone on the stock pair I've had for 5 yrs w 1000+ hrs. The velcro-held grills I designed didn't match his strength...I now have grills that are screwed on and off so the mod-65s will be safe from his grip.
Before installing the DRFs I broke them in on a t-amp/ipod in 5-6 hr sessions over many weeks for over 150 hrs. While I did not A/B the stock/DRFs side-by-side as I had planned, I've grown quite familiar with the sound of the stock and here are my impressions:
The most obvious improvement is in the highs...must be those tube phase plugs, but much more focus and location on the highs now. Second, the bass is noticeably tighter and punchier. Third, the DRFs seem to have less mid shout/ring than the stock. Finally it seems that the DRFs have a subtle and slightly lower SPL than the stock, although this may be due to age and break-in "looseness" of the old stock drivers.
Overall a not-so-subtle improvement...thanks!
Regards,
Mario
Mario,
Thanks for the feedback... I've gotten similar feedback from every Abby owner who has tried them! While a typical 9 pin preamp tube is standard, I find that using a longer 9 pin tube, such as an EL84 for example, makes even further improvements in focus.
The efficiency does go down a bit, but in reality it stays the same. The perception is due to reduction of midrange peeks that were adding an artificial presence.
Please keep us updated with any further observations you might have as you continue to use them.
Steve