Use only one power amp and connect to the loudspeaker as normal (positive to positive, negative to negative). Are you using a mono preamp?
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Like Onhwy61 said, only use one mono amp and hook it up as you normally would negative to negative and positive to positive. Then set your preamp to "Mono" playback and you should be fine.
If you try to combine both mono amps on one speaker the way you were suggesting, you'll likely blow something up.
Thanks a lot for the advice,
I am using stereo preamp, for this case should I choose the monoblock connected with red interconnect cable from preamp?
And if I connect one monoblock only, what should I do with the other monoblock? Should I turn it on with black cable connected to preamp?
I am not sure what will be the function of the other interconnect connected to the unused monoblock amp
Am sorry for my dumb question as I can't afford to ruin my amp/speaker if something wrong happen when I experiment with it.
If playing a mono cartridge (most have two sets of outputs where the same signal appears on both the red/green and blue/white set of terminals) into a stereo preamp/system a precise sound-image will appear right between the two speakers.
If you just want to try what it sounds like with a single speaker, just leave one of the mono blocks off and the sound will come from only the side that's left on. If you want to go "Purist" disconnect the interconnect going to the
unused amplifier, that way it'll be easy to go back to normal once you get your curiosity satisfied :-)
You will not be able to hook up both mono blocks to just one speaker unless your speakers are set up for bi-wiring, where one mono block would drive the HF/MF section of the speaker and the other the LF section
Good listening and happy holidays