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New Rowland Criterion 2-chassis battery pre

Jeff Rowland Design has just created a page for its upcoming statement-level, twin chassis, battery powered full function preamplifier. Detail is still scant, but a little bit of info is already available, in addition to front and rear view pics. Here’s the page:
http://jeffrowland.com/Criterion.htm
And here’s the front view:
http://jeffrowland.com/Criterion-front.htm
And here’s the rear view:
http://jeffrowland.com/Criterion-back.htm

You will find a few specs already on the site. JRDG should be publishing more info in the next few weeks. I will post here as I receive it. in addition to the published specs that you can read on the page above, here are a very few additional tidbits that I have learned this far:

. Uses Burr Brown TI OPA1632 high speed fully differentially balanced modules.
. Includes phono stage.
. Uses standard NiMH D-cell batteries available in most electronics stores, loaded in 2 rear-inserted tubes of power supply chassis.
. Capable of AC/DC operation . . . will recharge batteries on independent circuit during AC operation.
. Full remote control
. Target price $18K (not sure yet)
. Availability: probably early Fall 2008.
. Will be featured at RMAF in Soundings Hifi suite Marriott 503 or 505 from Oct 10th to 12th in Denver.

And sorry folks, I have not heard this device yet. Nor I have any good third party reports on its sound. Any speculations on Sonics from my part would be just. . . pure speculations. I’ll keep everyone posted as I learn more.

Guido
guidocorona
mrjstark
1,112 posts
 
Looks very good. 18K is a bit much though. 9K ....maybe.

Anyway - looking forward to compare it to my RWA Isabella.
I just hope that- it is that much better.....until then, Dodd and RWA Isabella are IMHO one of the best values. No....not cheap, but if getting off the grid, simplicity and sound quality are your goals, it might be worthy investment.

Mariusz
dgarretson
2,394 posts
 
The proof is in the listening, but generally speaking series-connected NiMH batteries are a poor choice for SOTA. They have up to several ohms of impedance, as compared to several milliohms for large SLA batteries. You can hear these differences, though adding massive capacitance may ameliorate the situation somewhat.

Why would a designer choose NiMH over SLA? Convenience, ROHS issues concerning lead content, gassing issues, transportation issues. But not for SOTA.
dazzdax
599 posts
 
My personal opinion is: every "reference" preamplifier will give you excellent sound, even the older ones. Examples: CAT SL-1, Accuphase C-290V, Mark Levinson No. 26S/No. 32, BAT REX, Conrad-Johnson ART, Goldmund, FM Acoustics, JDRG Consummate/Coherence II, WAVAC, Cello Audio Suite, Jadis JP-80, VAC Renaissance, etc. If you own one of the abovementioned preamps, there is really no reason to replace this unit with another unit from different brand. Unless you have too much money...

Chris
guidocorona OP
4,114 posts
 
Dgarretson, I will ask JRDG about the relative high impedance issue with NiMH that you report. As for SLAs. . . I was burnt once -- and not metaphorically speaking as there were fine flames involved.

Marius, I am looking forward to listening to the Dod and RWA Isabella, although I am more and more leaning toward SS devices for reason of upkeep and sonic preference.

Chris, fab attempt at raising one more hornets nest!

Guido
dgarretson
2,394 posts
 
Guido,
IME monolithic op amps can sound great on batteries-- perhaps surpassing tubes-- but if that preamp has anything short of magnificent bass control & dynamic authority, you can likely blame choice of NiMH batteries.
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