TPA6120A2: By what means do I shift the second channel through 180 deg? And by using just one channel in effect twice, will I actually benefit from a greater output?

As I am only able to take the output from either the left or the right channel, is it possible to safely combine these from my ASUS Xonar Essence STX Sound Card into a single mono output, please?

If you can send your original signal on one channel, and an inverted version of the same signal on the other channel. This would allow you to connect the load in "pseudo-differential" way.

What I mean is send original signal on right channel and the same signal but shifted 180deg on the left channel.

Best regards,
-Ivan Salazar
Applications Engineer - Low Power Audio & Actuators

Dear Ivan.

I am sorry that my technical expertise is so limited, but by what means do I shift the second channel through 180 deg?

And by using just one channel in effect twice, will I actually benefit from a greater output?

Thank you so very much.

Christopher J James

PREVIOUS CORRESPONDENCE

In response to the kind reply to my earlier query by Ivan Salazar, today the Sennheiser headphone cable arrived and thus I have been able to connect up my test rig.

It works just fine, but I am wondering; as I am only able to take the output from either the left or the right channel, is it possible to safely combine these from my ASUS Xonar Essence STX Sound Card into a single mono output, please?

There are numerous videos on YouTube demonstrating the use of fairly lower powered transistors used to combine the + output from both sources into a single mono plug, but they generally are being deployed from low power ouputs such as an iPhone.

Is the procedure acceptable bearing in mind my aim is not for listening but purely as a driver, and if so should I use say two a 2-gang rotary potentiometer?

If this would seem to be acceptable bearing in mind the power output of the Zonar Sound Card, what value potentiometer might you suggest please?

Thank you so very much.

Christopher

ASUS Xonar Essence STX Sound Card.

• · Output Signal-to-Noise Ratio (A-Weighted):
  124dB for Front-out,117dB for Headphone-out (600ohms) dB
  Input Signal-to-Noise Ratio (A-Weighted):
  118 dB
  Output THD+N at 1kHz:
  0.0003% (-110dB) for Front-out, 0.001% (-100dB) for Headphone-out
  Input THD+N at 1kHz:
  0.0002% (-113dB) for Line-in
  Frequency Response (-3dB, 24-bit/192kHz input):
  <10Hz to 90KHz
  Output/Input Full-Scale Voltage
  2 Vrms (5.65 Vp-p)
• · Bus Compatibility

PCI Express:
-PCI Express Rev. specification compatible
-Compatible with X1, X4, X8, X16 PCI Express slots

• · Main Chipset

Audio Processor:
ASUS AV100 High-Definition Sound Processor (Max. 192KHz/24bit)
24-bit D-A Converter of Digital Sources:
Texas Instruments PCM1792A*1 for Front-Out (127dB SNR, Max. 192kHz/24bit)
24-bit A-D Converter for Analog Inputs:
Cirrus-Logic CS5381* 1 (120dB SNR, Max. 192kHz/24bit)
High Fidelity Headphone Amplifier:
Texas Instruments 6120A2*1 (120dB SNR, 100dB THD+N @ Vcc±12V, RL=600Ω, f=1kHz)