Hey Eurorom,
Hope you are recovering well from the back surgery. Lots of time to listen to your system, yes?
I would love to hear more about how you have your Adcom working and what Outlaw equipment you have associated with it. Would you mind e-mailing me, so we can compare notes. I am still not getting anything close to the output that you are from your bridged 555II into a 4ohm sub.

Also, most subs have one or more impedance peaks in the 25-50 Hz range due to resonances, as well as climbing impedance with frequency due to voice coil inductance. In the cases I've actually measured or modeled it was more a case of impedance sometimes dropping to 7 ohms or so more than hovering around 8 ohms and dipping lower, if that makes sense. Taken as a broad band average from say 80 Hz down my current set of subs are something more like average of 13 ohms, with a ~7.1 ohm minimum.

[Warning: Some English was used to form the above]

Anyway, Euro, get well.

Regarding bridging, I wish the Outlaws would make their multi-channel offerings at least partly bridgable. I bet more than one person would get a 770 for 5.1 if they could do things like bridge for more power on the mains or bridge for a powerful subwoofer amp.

Well Kiwi I am still in pain so I have to take some pain pills,I guess is going to take 6 weeks for my back to heal,thanks for asking.Now on a second note,my Adcom 555 is bridge and powering a SVS 25-31CS-PLUS rated at 500 watts at 4ohms with peaks of 1000 watts, so the manual states,but I do not think the subwoofer can handle the 1000 watts.I used the 555 in stereo mode and it would clip in some sequences for example the Monsters Inc.(the sock event)and Minority Report(the manufacturing plant gun shots on DTS)so I bridge my amp which according to the manual it is rated at 850 continuous and now I get my SVS to bottom out without getting my 555 to light-up the lights.I also did the same thing with a Carver amp rated at 1000 watts at 8 ohms in bridge mode,but not rated at 4ohms;well the amp would go into protection at some loud levels,the reason beign that the Carver is not rated at 4ohms in bridge mode.I also used the Carver(1.0t)in stereo mode which is rated at 200 watts per channel at 8 ohms,and 400 at 4ohms with the SVS but did not get the weight and authority that the Adcom 555 gave me in every mode.Also the 555 is rated at 27 gain in stereo mode,and 30 in bridge mode,so by bridging your amp you would automatically gain 3db's of output.So how sensitive is your sub at one meter?What is the wattage rating at 4 ohms?And how many feet are you seatting from the sub?Oh by the way I am using JBL Studio Monitors Bi-Radials two ways that out-put at one meter 119 db's,and the SVS keeps-up with them,NOT as good as my old JBL-Pro Subwoofer,but because of space the SVS will do for a while....(remember if I mispell I am on medication)

There is a difference between thermal capacity and physical excursion limit, and so this makes it tough for a speaker manufacturer to generate a meaningful power limit. Full range speakers get even more tricky. It is, for instance, a rare tweeter that can really handle a 50 watt signal.

Hi Euro,
I, for one, do not need medication to misspell, although the idea is appealing HAHA!
Relax, heal slowly and listen to music!
My sub is 95db efficient and supposedly handles 600WattsRMS /1000Watts peak. I measure outout with the prescibed R/Shack meter (C weighted/slow response) at the seated position 15 feet from the sub which at this stage is corner loaded in a 23x 14 room that is loaded with typically cohabitant family stuff. Baskets and wife s..t everywhere, you guys get the picture i'm sure! Took me hours to stop all this crap from rattling and messing with my sound ! (Hooray for bluetac!)
This is a very high quality, and expensive, Pro driver from Kenwood, professionally assembled in a ported enclosure, but I doubt very much it would handle 600 Watts. I have in the past attended a Kenwood demo and heard this sub really crank at surprising levels, so in retrospect perhaps the design is off the mark ! Hmmmmmmm - never considered that !
I previously drove it with one of Madisounds pitiful sub amps, but my output now is actually no more than then !
My own take on my problem is that the eventuating LFE line output voltage at the Adcoms input is just not nominal. I have the ICBM between the 950 and 755 with the LFE from the ICBM running to the Adcom.
I do however, have the ICBM switched to special (36db slope), and have not tried the 12db normal setting, as I hate midbass creeping into a subs channel, but maybe I should try this !

[This message has been edited by Kiwi (edited February 13, 2003).]

Kiwi,Let's go over some trouble shooting here,your sub is very sensitive for a sub,and you are not too far from the sub(main seating ares)so let's go over your connections.For mono operation,the Stereo/Bridge switch on the rear panel should be placed in the bridge position.In the Bridge mode only a single input cable is used.The input cable to the GFA-555 should be into the RIGHT CHANNEL input only. When connecting a singlespeaker to the GFA-555 in bridge operation,the positive terminal of the speaker should be connected to the RIGHT channel positive(red) outpost on the 555.The negative terminal of the speaker should be connected to the LEFT channel positive(red) output post.Remember that when connecting the speaker wires,you should maintain proper phasing to obtain maximum bass response.Now check with your manufacture on you sub,to see how the polarity of your sub works,since some are invered in the inside by mistake. Hope this helps,best of luck.