So, coming from 4 active signals lines, even 8x of them. We will be thinking that we can amplify these signals directly and have no consequences but only benefits ? In reality, there are always trade offs. Nothing is all good, and nothing is all bad either. In this case of being Solid states and Opamps, when we combine 4 active signals lines into only 2 lines with Ground references…AKa, differentials, and AKA, Single ended from a Balanced output.
What do we loose ? First of all, we loose the high voltage from Swing to Swing, and it is cut in halves. For example, it should have been 4.4V, but now it is 2.2V instead.
What do we gain ? Higher quality from the Single ended, or whatever remained. The L+ and R+ is now have been improved technically. How so ?
1/ We have summed the Phases errors by using the Ground references, and hence eliminating Crossover Distortions
2/ We also summed the signals up and in turn, canceling out errors, noises (a form of Analog error corrections). Hence, lower floor noises, lowered distortions, and higher dynamic range. One Example is that if you take ESS9038Pro, and you utilize all channels on one single chip, you are not getting 140Db dynamic range, rather you are getting only 133Db or so. However, when you sum them all up into 1 channel, the dynamic range actually is improved
Finally, the benefits we have gained ? Better performances, at the trade offs of Power output. Then again, how did you sum them up, how did the differential stages get implemented ? It play a huge key roles. It is very complex in lab measurements, and also subjective acoustic tuning. Most of the people would want to make it simpler and easier, and to simply follow balanced to balanced and single ended to single ended
Wait! So how come most of the time Balanced output resulting in better separations and soundstage ? Because of power …. Remember ? We trade off the power output for better quality ! Especially when power is such a vital part on the little system of DAP
Now, back to the Differential stage for the output on Amp14. Did we not talk about how beneficials being single-ended could have been ? Then why do we go back to separating it out to be balanced again ? Because Power baby ! We want more power ! And because it is essential for a DAP.
Ok, I am confused, why did we started with Single ended again ? Because we don’t have space for 2 Korg Tubes . Also, Because we want tube distortions and overtones
Is it bad ? Is it good ? It depends on the implementations! Let your ears judge ! But I believe it is the best solution here given what Ibasso have to work with. At least, we are not seeing another “Non innovated ideas as other brands ”