How do I hook up the NAD 2140 power amp in bridged mono mode? there are no markings on the back to signify which speaker inputs are the ones to use like on most power amps. I do not have the manual either.
thanx in advance for your help.
Paul Cyr
Posted on
Bridging the 2140
Hello, I apologize if the message is long, but I wanted to give it to you exactly as stated in the manual. As stated in the NAD manual: 1) Disconnect the signal cable from the left-channel input to the 2140. In the bridged (monophonic) mode the amplifier is driven through its right-channel input only (either the LAB or NORMAL input). 2) Disconnect any speaker wires from both the SPEAKERS A and SPEAKERS B terminals. From the speaker to be driven by the 2140, connect the positive lead to the red (R+) terminal, and its negative lead to the red (L+) terminal, in the SPEAKERS A group of terminals. NOTE: DO NOT connect any wires to the black (R-) and (L-) terminals. If you want to drive two speakers in parallel, connect the second speakers leads to the (R+) an (L+) terminals in the SPEAKERS B group, make no connection to the black (R-) and (L-) terminals. NOTE: In the bridged monophonic mode, the loudspeakers impedance appears to be halved as "seen" by the amplifier. An 8-ohm load looks like 4-ohms, a 4 ohm load looks like 2-ohms, and a pair of 4-ohm speakers operated in parallel will look like a 1-ohm load. Driving a pair of such speakers to high levels may causethe amplifier to overheat, activating its protection circuits. CAUTION: In the bridged mode the speaker wires must be "floating" with respect to ground. DO NOT connect the speaker wires to anything which shares a common ground between stereo channels (such as a headphone adapter) nor a common ground with the 2140's inpus (such as a switching comparator or a distortion analyzer). 3) After the preceding conditions have been satisfied, use the bridging switch. It is normally covered by a metal bracket to prevent its accidental use. Loosen the screw which holds the bracket in place and swing it out of the way or remove it altogether. Press and release the BRIDGING button. The button has two settings: IN-normal stereo mode, OUT-bridged monophonic mode Hope that helps, Paul
Anonymous
Posted on
I have the manual for this amp and it does not mention this stuff! Though the explanation above is perfectand is completely correct.