Biamping Dunlavy SC-V

Thx for response.

I started this thread because I did biamping before with four identical Acoustic Reality ICEpower amps (each with 500wpc), but when biamped there is a reinforcement of bass (some 3 dB or more) while the midrange/treble were a bit subdued and less dynamic. The whole picture is also less coherent. I still don't understand why such gross tonal shift occured. Some friends informed me about a possible mismatch between the bass and the midrange/treble cross over, but why should such a designer like John Dunlavy give each half of the devided cross over network another impedance?

Hi Sean, thx for the thorough explanation. I'm not a technician, but wouldn't a well designed loudspeaker system comprise drivers with the same impedance? Otherwise the system would not sounding balanced through out the frequency spectrum. But it "sounds" like there is some impedance mismatch (as I stated earlier) between the two halves of the cross over networks. What I hear is an almost caricatural reproduction of music, with a far too loud bass and recessed and undynamic midrange/treble. Btw, I'm also using the same speaker cables and a pair of interconnects, splitted by an Y-splitter to provide both monoamps with the same signal (in biamp configuration).

Thanks both of you Sean and Tom. You have been tremendously helpful. You are very knowledgable Sean, you must have a technical background I suppose.
Well, the Acoustic Reality has an 8 kOhm input impedance, which is low. An Accuphase representative stated that that wouldn't be a problem with the C-290V preamp I am currently using. But when splitting the signal at the end of the interconnect the amp's input impedance is going to be... 4 kOhms, which is very low indeed. How can I raise the input impedance of the amp? Would be using two pairs of interconnects a solution? The preamp has two pairs of outputs. I've been told though that the preamp actually splits the signal that goes to the amps, instead of driving the two outputs actively. So it will also "see" halved input impedance.

Hi folks, I just want to let you know that the problem has been solved. I asked Peter Thompsen from Acoustic Reality and he has been very kind to get into some analysis of the problem. Due to his suggestions it is now clear what the culprit of the problem was: it was probably related to wrong pin configuration of the XLR plugs. Thank you Peter for your suggestions.