Balanced line level to drive RCA amp in bridged mode

[muddasirwaheedmalik]

Hi ,

Can i use Balanced output from my preamplifier to get splitted RCA signal from hot/cold and neutral pins to drive L+R channel of an amplifier and take output from hot pins of amplifier output thus making a bridge and hence converting a stereo amplifier into monoural bridged amplifier ?

Just wanted to know before making any go ahead....would simply cut the female XLR connector and attatch 2 RCAs on each output for my twin Yamaha B-5 amplifier.....want to have 2 monoblocks.......700W/channel into 8 ohs, and 60 W Class A per amp in Yamaha B-4 amp?

Please suggest

[wahab]

Your balanced XLR has a GROUND and two outputs wich are in opposed
phase , so you just have to use Ground/+ ouput for a RCA connector
and Ground/-output for the second one and plug onto right and left channel.

By convention the right channel hot pin output will be used as +
and the left channel HOT PIN output as -/VIRTUAL GROUND to connect the speaker.

[AndrewT]

No.
Convert the amplifier to accept the balanced input and use the two signals from the input circuit to feed the two channels of the bridged amplifier.

[AndrewT]

Wahab,
PIN1 of the output is not a signal reference voltage. PIN1 is connected directly to chassis and the two signal wires PIN2 & PIN3 do not necessarily reference to the chassis.

[Zen Mod]

Originally Posted by muddasirwaheedmalik

Hi ,

Can i use Balanced output from my preamplifier ....

yes , you can , if output of preamp is truly symmetrical

[muddasirwaheedmalik]

i intend to use this Behringer DI box for unbalanced to balanced convertor:with two unbalanced inputs i can have upto 8 outputs, high input impedance of 1Mohm, 600 ohm output impedance, plus it has a ground lift switch.

But what about the conversion Andrew T, can i do it this way , i cannot understand what is being said here. my apologies. whats the difference in splitting the Balanced output from DI800 with ground lifted run each channel with hot/cold pin 2/3 and ground pin and take outputs from both hot terminals of speaker, in this way i would not have to open and modify amplifier ?

Is it doable?

[wahab]

Originally Posted by AndrewT

Wahab,
PIN1 of the output is not a signal reference voltage. PIN1 is connected directly to chassis and the two signal wires PIN2 & PIN3 do not necessarily reference to the chassis.

As pointed by Zenmod , if it s not a mock XLR , it s possible...

The signals are referenced to ground not to the chassis if it s
a safe XLR.

[muddasirwaheedmalik]

would the output be completely balanced/symmetrical , i think so with this
BEHRINGER: DI800

[muddasirwaheedmalik]

BTW i also have KRELL KRC_HR preamplifer with a pair of XLR outputs and i assume they should be symmetrical as i am driving KRELL FPB 600 amplifier with XLR cables and ground pin removed for fully balanced operation

[Speedskater]

Originally Posted by AndrewT

PIN1 of the output is not a signal reference voltage. PIN1 is connected directly to chassis and the two signal wires PIN2 & PIN3 do not necessarily reference to the chassis.

This is exactly CORRECT !
In as much as Pin #1 of an XLR connect is NOT part of the audio circuit, it should not be used as a reference or as part of the audio circuit.