2 REL Strata Subs and Mono amps

Zormi, I normally don't suggest components unless the poster asks or presents alternatives himself. In your case, I would suggest giving a good listening to the Confidence C1 IIs at about half the Diablo's price. In my humble opinion they are among the best standmounts ever, for several reasons: deep and controlled bass enough even for medium-sized rooms, a soundstage that includes height reproduction, something rare among non-tower speakers (even Vandersteen 5s and 7s, as well as highly rated standmounts such as Raidhos don't do it), and all around sound as good as anything at two or three times the price. The C1 IIs definitely don't need a crossover, just augment their already impressive bass with your RELs at about 30Hz or a bit below.

By the way, I checked the Gibraltar manual online and on page 12 it explains the way to connect to differential amplifiers such as your Krells, basically to connect the black Speakon wire to a chassis screw as was explained by others here. That's also how Nelson Pass suggest doing it with his balanced amplifiers, and he provides another set of ground posts just for that.

12-30-12: Vladimir
I checked the Gibraltar manual online and on page 12 it explains the way to connect to differential amplifiers such as your Krells, basically to connect the black Speakon wire to a chassis screw as was explained by others here.

Thanks, Vladimir. However, as I indicated in my first post dated today, based on my research it appears that these particular Krell amps are not differential or balanced or bridged. I suggested confirming that with Krell, though.

Regards,
-- Al

Wow Vladimir..

Nice idea with C1 MkII, already under consideration. I know them well, since I use to own original edition Confidence C1... In fact, I owned both Utopia Micro Be and Confidence C1 until the end of 2008, simultaneously. Two different worlds, each one impressive on his own way... I now prefer a bit the Utopia Diablo because a slight edge over Dyn C1 in mid/high clarity and detail rendition. Bass aside, this is where C1 excells, but RELs defeat that area as a serious issue. Price wise, I have a great dealer from Belgrade, Serbia, which is able to bring me a pair of Diablos including dedicated stands for the same money as pair of C1 MkII without stands at another dealer. But, price doesn't matter too much... differences between the two simply not prominent enough to have any serious impact on decision.

The C1 IIs sound better than the Mk Is, but I would take that Diablo bargain from your dealer in two seconds flat!

By the way, I used a Storm III for many years with several speakers, including B&W Matrix 805s, 805s and 804s. One thing most people don't know about RELs is that they can improve the bass of almost any speaker, but that's not their main advantage; it is the way they improve the soundstage and the general sound of the main speakers because of the ambient clues hidden in the low frequencies and the way they 'come from underneath' the main speakers.

Enjoy the music!

@ Vladimir

Yes, I've just checked the Gibraltar G1 manual, and they indeed give on the p. 12 the same advice Al gave to me above (if power amp is balanced ie differential).

What they don't say is what to do in case of having two subs (stereo sub system) and balanced amplifier, as I have... Following strictly their user guide (bottom half of the p. 12), an average audiophile in my position will normally connect even fully balanced amp with two subs, the way REL suggests, and probably damage the amp.