Dunlavy SC IV Speaker- Any Good???

As to your question about power, I think Dunlavy suggested 100 watts per channel.  My recollection is that the Dunlavys were about 90db efficient, and a nominal 4 ohm load.  For my Duntech Princesses, a similar load, I used a Krell KSA 80 (100 watts pure class A), ARC M300 (300 watts pentode) and then Classic 150 monoblocks (130 watts triode) and Jadis JA80 monoblocks (60 watts), and also used a Sonogy Black Knight (200 watts per channel) and Concept 60 (60 watts per channel) solid state amps  The JA80s were weak in the deep bass but a wonderful midrange and easily drove the speakers; the higher powered amps did a better job controlling the bass and were a little more dynamic, though at the volumes I listened there wasn't that much of a difference.  I heard the SC-IVs with, among others, VTL amps (about 120 Watts) and a VAC Renaissance 30-30, and the VACs were surprisingly good, again a little weaker in the deep bass.  I think I saw you have a lower-powered Pass amp, but if it's Class A it might be able to do the job. 

My recollection is that the speakers did well at lower volumes, but I'd say they did open up a bit at higher volume levels.  Perhaps our current owners can address that question.

I have a pair of SC V's as the front speakers on my surround system. At 7'4" tall and 340 lbs. they make my 74" tv look small. I wish I could post a pic.

John Dunlavy was an actual rocket scientist. He was responsible for the communications for NASA during the race to the moon. Started designing speakers on the side and formed companies later in his life. Man was a genius.

@chorus 

i currently own Duntech Princess and have owned them for 16 years.  I highly recommend them! They sound great with Pass Aleph 3 or anything of higher wattage; class A is best.  These require space to the sides, not as sensitive to the wall behind them.   A pair of Talon Pheonix replaced these as my main speakers.   The Talon were replaced by Rockport Cygnus.   Currently,  the Duntech are played in the pool house.  

good luck and happy hunting, 

jose

@chorus 

Agreed with @jg2077, Dunlavys are easy to drive and relatively sensitive, so they'll sound good with 30W on up.

My III.As are driven by Rogue M-150s, and it's a great combination.  I sold my Aragon 4004 Mk II and moved to the Rogues to enjoy the midrange lushness, as the Dunlavys don't need help revealing the upper registers.

My first audition of the IVs (non-As) was with an Exposure integrated, in fact.  I don't think the output power was much higher than the low teens in watts.  So even at those low power levels (AB bias, even) - that was the configuration that hooked me into seeking the setup I have now.  I'd expect Class A (like jg2077's setup) would sound sublime.

I had the audition today. The owner powers things with a sony receiver.

Has a couch in front of the woofer on one side. Not a satisfying experience.

Also wants about $800 over the comps and lost parts for the plinths.