Discussion of Class D Amps Application & Experiences

I tried the M700s and the Stellar Dac/Pre. The dac/pre was dry, did not throw a good sound stage. IMHO, it needs a outboard PS, which PSA often does. I questioned Paul about the lack of it, but of course, he held the party line.


I found the M700s quite good, even though at that time I was plugging various class D amps into my Core Power 1800. At that time Ric Schultz came out with the EVS 1200, at a comparable price to what I bought and could sell the M700s for, but the 1200 had ~ 50% more power (which I need in my 20 x 40 x 12 ft peak room, AND was essentially hand tweaked by Ric who knows his tweaking and cuts no corners, as most commercial products (especially ones costing M700 money), are forced to do.

I started out plugging the EVS 1200 into the 1800, but one day my Spidey Sense told me to plug it direct into my 20 amp dedicated line. WOW. Just doing that ONE simple thing made a HUGE improvement

I suspect there are many more changes that need to be made before one should critique class D in their systems.


hth

I am in high anticipation of receiving LSA Voyager GaN amp 100wpc $2500 (sold through Emerald Physics)



In the mean time I love my Ric Shultz EVS 1200, which is a 600wpc dual mono IceEdge 1200AS2 class D modules plus lots of Rics pixie dust < $2500

RE: EVS 1200

Ric promotes adding weight to all equipment. Due to tight space in the rack I could only slide a 5 pound divers weight which has been there as long as I have had the 1200. He also would not sell me the 1200 without the Cubes: one each affixed to each Ice module.


Since getting the 1200 I have made many cable upgrades as well as adding Core Power 1800. Now, I want to remove the Cubes, but it’s a 2 person job to remove from the rack, and reinsert. When I do this I am going to leave the top off too

In the meantime, in one of the forums the other day someone mentioned Shungite, which I bought from a company who has the authentic Shungite from the meteor that crashed in Russia decades ago, I did not purchase Shungite for audio, but have 4 chunks not being used that easily fit in the palm of my hand weighing less than 2 ozs, so I decided to put them on top of my 1200 at the back near the power cord.

I forgot about it, and while watching the draft last night I was listening to an old GRP digital remaster: Dave Grusin Gershwin Connection, but it sounded flat (the leading edge top end was lopped off) I cleaned the disc to no avail. As I watched the draft it occurred to me that I had put Shungite on the amp. I removed it and the leading edge was back in full


Just amazing

+1 bryfi

Underwood HiFi has an incredible special right now on 2 new W4S integrated amps

+1 erik

Gfi

if you wanted to make a pertinent point, you should have provided dates of these comments

I love my EVS 1200 even more that I now have the EP 3.4s.


I can’t imagine Rics new venture could possibly be better, well, perhaps in smaller rooms it might

Underwood HiFi's Voyager GaN amp $3K/200wpc should be shipping soon. They seem to have a trade in policy to boot!

Markmuse:


I quite liked the M700s, but in my 20 x 40 x 12ft peak, even though my speakers at the time were 93dB (but the woofers were only 10"s I just couldn't get the coupling spl I wanted. Also, Ric introduced his EVS 1200 for about the same price I bought/sold my M700s for, and he offered a 30 day money back.


Best move I made until recently, when I got a pair of EP 3.4s which do not have woofers BUT have 12" carbon Fiber midrange with concentric polyester tweeters. These have taken the music up a few notches, but am anticipating receiving EP 2.8s tomorrow. In addition to the same 12" woofer/tweeter, these have dual 15" carbon fiber woofers in a D'appolito configuration. Needless to say- I CAN'T WAIT

All audios journeys are tied to dollars and rooms

My room is huge volumetrically speaking: ~ 20 x 40 x 12ft peak in open beam ceiling, front wall is 70% glass floor to ceiling, while the back wall is actually 3 sided all glass from floor to ceiling, plus up/down stairwell in the middle of one long wall, all of which add up to needing more umph to load this room.

Approximately 3-4 years ago I purchased Emerald Physics KCIIs knowing they would be out of their depth, BUT, they came with a BOM (bass management) and I already had 2 @ 12" SVS powered subs, whose volume controls are the WORST, driving the amps to play WAY too loud when barely cracked, and was hoping the BOM would solve it, but no bueno. I even have an pair of EVS attenuators, which I tried on the SVS sub inputs running their built in VC at full volume, but adjusting the attenuators starting low, again no bueno.

Various Class D amps included Emerald Physics 100.2 SE monos with upgraded fuses, but they didn’t do it for me, followed by Audio Alchemy DPA-1, followed by PS Audio M700s, which did a very good job, and I would have kept them longer, BUT, they are stock, AND, at that time (a year ago?) Ric introduced the EVS 1200, which was only a couple hundred dollars more then what I knew I could sell the M700s for. For me that was a no brainer, whether I need all that power or not, it is a hot rod of Rics tweaking abilities. And, I totally agree that bigger power supplies can be HUGE on smaller wattage amps

The 1200 combined with the 3.4s is quite magical on quality recordings, but lower bass is still missing IN THIS ROOM. I have been impatiently waiting for EP 2.8s which are 97db when single amped. The speakers are arranged in D’Apolito each with 2 @ 15" carbon fiber woofers in addition to the same 12" carbon fiber concentric driver/ polyester tweeter as in my 3.4s. Once they’re in the system, I could evaluate your Purifi amp, and am still in line for the LSA Voyager GaN amp MSRP $3000 for 200/400wpc: I am told it has a bigger PS than needed for the same reasons Ric mentioned. It is possible that the EVS 1200 could eventually be used for the bass and one of these amps for the mids/tweeters (be still my beating heart). In this case possible likely means probable

https://www.underwoodhifi.com/products/lsa-electronics

hth

The Veros PWR picture should have something next to it for size comparison. Damn thing looks huge.

Low and behold, in the September Stereophile, Herb Reichert reviews it, complete with hood open view for you techies

But $10K? Damn

Major hugs to Tweak Audio and Underwood HiFifor keeping pricing accessible so that more audiophiles can enjoy the tech

Manny, next level tweaks for out beloved and bespoked 1200s?


Where did you hear this?

Snaps +1

I never tried the Cherries, but after 14 months and a speaker upgrade I still love my EVS 1200