ARC REF 110 owners

I'm using an ARC REF 3, my speakers are Wilson W/P 8. Yes, I purchased the amp new. It was one of the last few 110s produced, it also came with the kt 120 tubes. It has about 100 hours on it currently, however some instruments sound a little off, further middle to lower midrange seems a tad anemic

FF116...give it some more time to break-in but one of the issues could be the amp-speaker match. The WP-8's impedance dips below 4 ohms between 20 and 40 Hz and between 60 and what looks like 120-130Hz on the impedance curve, reaching a low of 2.2ohm at 77Hz, causing it to be a very tough load on the partnering amp in the lower bass region and in the upper bass region. What you might be hearing is a bit of leanness in the the upper bass region because the Ref 110 is finding it tough delivering enough current in that 70-100 Hz range. Here is a link to the WP-8's measurement section in the Sterophile review: http://www.stereophile.com/content/wilson-audio-specialties-wattpuppy-system-8-loudspeaker-measurements

Here is a link to the Impedance and Phase curve across the frequency spectrum that shows the dips mentioned above: http://www.stereophile.com/images/archivesart/607WILFIG03.jpg

JA summs up his measurement section with the following quote:

It is definitely a difficult load for an amplifier to drive, which leaves me puzzled as to why Wes had no problems driving it with the tubed Cayin amplifier. The Wilson did sound superb driven by Ayre MX-R monoblocks on both of the occasions I listened seriously to it in Wes's room, but its idiosyncratic low-frequency behavior compared with more conventional designs will make matching it to the listening room tricky—a task best left to the Wilson-trained dealer who will be installing the WATT/Puppy 8s in the customer's room.

You may want to give both Wilson and Audio Research a call and ask them both about the amp/speaker match and what you are hearing. My guess is as the amp breaks in a bit further you will get better bottom-end heft which may add some weight and texture to the currently anemic presentation you are getting for certain instruments but I would certainly get Wilson and ARC's take on this as well. By the way, my speakers (Thiel 2.4s) are a tougher load than your WP-8s and I do not experience any "leanness" in the sonic presentation across the frequency spectrum, so hopefully it is just a break-in issue and the botton-end heft will fill out and add some weight and texture to the presentation.

Good luck.

You may want to run your speakers off the 4 ohm tap of the ARC. Also, don't be so quick to blame the amp, interconnects and speaker wire play a huge role in the sonic signature of your system. Maybe your hearing your system for the first time. Are you using older silver cables? When was the last time the tubes were replaced in your Ref3? Remember now that your system is resolving better, you need to be a bit more critical about the surrounding components that make up your system.

Hey Cmalak, checked out the Wilson phase and impedance chart. I was totally floored because it looked very similar to the readings for my Paradigm Signature 8 v2 (w/ Be tweeter). The curves in the bass region look like a double humped camel. Weird/???

www.hometheaterhifi.com/home-theater-speakers/476-a-secrets-speaker-system-review.html?start=3

I don't know if this will be useful to know, but my front end is an ARC Ref-5 and my amp is an ARC VS-115 (w/ KT-120 tubes). Although the Ref 110 sounds better than the VS-115, the two amps share similar power and other electrical attributes and my amp seems to drive my S8 fronts very well across the full FR. I use the 8 Ohm taps; tried the 4 Ohm taps, but the sound sucked. As an FWIW, I recall that ARC uses Wilson speakers in their sound room. So . . . I surmise that you should be getting superb results with your rig.

I would try switching taps as suggested by George (Hifigeek). Also, how old are your Ref 3 tubes. I believe that ARC recommends replacing the 6550C PS tube every 2000 hours and the 6H30 tubes every 4000 hours. If still no luck, call Cal at ARC.

Please let me know how you make out. Hey, at least you can ski on the impedance and phase curves, but only if you're expert skiier. LOL :)

My Ref 3 tubes are about 2200 hrs old, although the power tube was changed about 200 hours ago. The Ref 110 has about 185 hrs on it. BTW I'm using the 4 ohm tap currently.

I'm sure it is an unfair comparison but my Lamm ML 1.1s with the Ref 3 sounded full, and completely organic, with resolution that the Ref 110 can't quite match. You might say this is a bit of an experiment. Experience in this hobby has taught a bit of patience doesn't hurt. I was simply wondering if I could expect more in the way of improved sonics beyond this point. CMALAK I will check out the info mentioned, thanks.