Hello,
I had a Dunlavy SC-V and then bought a Dunavly SC-VI in 1998, the SC-VI is certainly better, both more extended and more dynamic. I have changed everything else in my system, but still have them. I have heard many top speakers, but so far nothing better considering the whole (I have not heard the Rockport Arrakis II). However, my SC-VI are now quite modded to deal with some weaknesses.
In terms os strenghts, they have great imaging, are very dynamic, natural sounding, and extended. One weakness (sort of) is the small sweet spot, but it is only a matter of sitting in the right place. Placement of speakers and listening position are very important.
I see the Dunlavy SC-VI having two major weaknesses that can be solved:
(i) Sibilance and lower than possible detail because of low quality/cost crossover parts (Solen) compared to what is available now. I and a friend (we both have EE degrees) mapped the crossover circuit, and we made two external crossovers using the same circuits, but using high end Duelund CAST-cu capacitors and Inductors, and Path Audio resistors. It was done in many steps, always measuring and listening, to make sure everything was moving forward compared to the original components, it took many months. The improvement is incredible, as everyone who heard them can corroborate. There is no more added sibilance, there is much more detail and air, so it sounds even more real.
Mapping the SC-VI crossover, it became clear that in many points they are not simply first order, it is quite complex. They are first order up to/down to a certain frequency, then another portion of the circuit kicks in making it second order after that frequency. This way it deals better with abnormalities far from the regular frequency range of a particular driver.
(ii) The original tweeters are limited in comparison with current top tweeters. After much searching (all currently available tweeters I could find) of tweeter specs, we replaced the original tweeters with Seas Crescendo tweeters, that have very similar sonic and electrical parameters. Again, measured and listened, and the improvement was substantial.
I am very happy with them. I think that Dunlavy's ideas and design are great, but certainly can be improved with current top components.
I may try additional mods, always having the possibility of going back on a mod if it does not improve the sound and keep the nice impulse response. I would like to try some custom made Audio Technology drivers for the 5", 8" and 15%, either top C-Quenze or Flexunits.
I wonder if anyone has the cabinet design information for the SC-VI. I plan to use Crossovershop LinearX LEAP for the circuit simulation (to make minor adjustments if necessary for changing a driver) and will measure the drivers directly in the enclosure, but it would be great to have the internal design of the cabinet, to be able to model it too.
Photos:
http://forum.audiogon.com/cgi-bin/fr.pl?vaslt&1206661296
Cheers,
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