Interestingly, the upcoming Rowland M725 will also be bridgeable. G. |
Husk, Corus uses a universal auto-ranging power supply.... There is no 110 or 220 model per se. See the Corus manual at:
http://jeffrowlandgroup.com/kb/questions.php?questionid=469 |
Rowland popularity slump in North America was partially caused by JRDG's adoption of class D for its highest end amplifiers. The new series of high bias class A/B amps from Rowland might cure the popularity slump. M625 stereo is already out, and a new M725 mono has been said to be out before year end. Looks like no more higher end class D amps from JRDG. G. |
Hi Giarcwm, M725 in unbridged configuration is likely to yield somewhere in the general vicinity of 300W over 8 Ohms... But the amp has not yet been released, and JRDG seems to be keeping information about M725 "pretty close to the vest"... We might need to wait until the RMAF weekend in October to learn all details about it, including actual power ratings in both bridged and unbridged configurations. G. |
Could not have said it better myself French_Fries (grins!) .... By the way, have you ever considered Corus instead of Criterion? Corus pre should sound very close to Criterion, unless you happen to receive very dirty AC in your home, and it is quite a bit less expensive than Criterion. And do not exclude the little Capri pre .... According to Rowland, Capri sounds better than any of the pres he has designed before, and I have much preferred it over my own ARC Ref 3 for most parameters. |
Gocubs999, I have not personally compared Capri (which I have used extensively) against Synergy (which I have never used). Mr. Rowland has asserted that Capri sounds comfortably better than all Synergy models. However, I have not heard any confirmation from a 3rd party as yet. G. |
Thank you Gocubs999, please let us all know the results of your upcoming Capri/Synergy comparisons! G. |
Just returned from RMAF. Rowland M725 were not shown. However, I have learned that M725 will not be bridgeable amps, but will operate as pure monoblocks. The power rating has not been announced. |
Husk, the Corus manual contains the following statement regarding operating voltages:
" Due to auto-ranging circuitry and dual-stage voltage regulation, the audio performance will not be affected by any voltage fluctuations within the operating voltage range. The CORUS PREAMPLIFIER can be operated at any mains voltage over the range of 85 to 265 VAC without any adjustments necessary. "
However, I have neither the technical nor the legal expertise to interpret the above and tell you if a unit destined to the European market can be operated safely in the US, or a unit destined to the US market can be operated in Europe. The only entities with such a technical and legal expertise are the JRDG factory and its registered distributors. G. |
Hi Cyrus, I usually pour over the various downloadable manuals, and refresh my memory with the Q&As in the JRDG Knowledge Base at:
http://jeffrowlandgroup.com/kb/
While the facility seems to have some gaps, it is amazingly complete on some devices..... there are over 120 questions on Criterion alone..... and most of them apply to Corus, except for those that discuss the NiMH battery system.
G.
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Daveyf, M925 are still in the making.... If we are extremely lucky, they might start making music by CES 2012. In the meantime, there is hope that Rowland will release the M725 bridgeable amp by Rocky Mountain 2011 in October... I have heard that M725 may contain some of the internal innovations originally developed for M925.
I have found a pic from the recent Hong Kong Audio show that shows M925, and a pair of M725.... Note that M725 look like the M625 stereo.
http://cybwiz.zenfolio.com/img/v27/p107232774-5.jpg
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Hgeifman, Rocky Mountain Audio Fest is the best time/place to pry rumors out of JRDG..... I'll try to find out if they have any plans for an integrated based on the current high bias A/B designs when I get there in mid October.
G. |
Gents, there exists a remarkably detailed and growing amount of operational information on Rowland products stored on the JRDG Knoledge Base at:
http://jeffrowlandgroup.com/kb/
I consult the knowledge base when I have any questions about JRDG products, before attempting anything else... and in most cases, I find a ready answer posted there. G. |
HGeifman, the Rowland SF dealer is:
Matt Aikawa
Moraga, CA
510 206-1766
nyatt@yahoo.com
Worth pointing out that Rowland has no/no/no current integrated amplifier based on a class A/B design. Any such hypothetical product at this point is no more than pure audiophilic speculation... Dealers will not have any hard information about such a mythical creature. G. |
Zabiaud, Rowland newest M625 clas a/b amp, as well as ICEpower-based amps in the 300 series like M312, M301, and the older M302 have a special current rectification system based on a technology called active Power Factor Rectification (PFC). This gives them a very significant amount of advantage in overall musical subtlety of the output, compared to M501 and M201. There exists an external PFC-based rectifier by Rowland called PC-1 that can be applied to M501 and M201.... and should bring those amps closer to the performance of the higher end ICEpower based 300 series.
Model 7 is a 25 year old class a/b design..... It is very sweet and has an enormous power reserve, but has neither the transparency nor the musical resolution of newer Rowland amplifiers.
Hope this helps.
Guido |
I believe that the M725 pair shown at the Osaka show consisted of operational prototypes... Which means that they were sonically active, but were not yet production-level devices. G. |
Just heard from JRDG.... M725 monos have been released and are shipping. US price is approximately $28K. Production level units should be listenable at CES 2012. G. |
All, it looks like the new Rowland M925 monoblock amp will be shown making music at CES 2013. Hopefully it will also be released soon. So I have created a thread dedicated to M925. Here is the URL:
http://forum.audiogon.com/cgi-bin/fr.pl?aamps&1356478534&openusid&zzGuidocorona&4&&
See you there! Guido |
