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Quote:
 Originally Posted by kaushama It seems, GO-VIBE's limiting factor as a portable amp is, its minimum operative voltage being given with 9v batteries. The optimal voltage for the amp seems to be 24V regulated, as Andrea experienced with it. Even the site says to have TD 9.4 V batteries for better performance.
True.

The Xenos instead, stock or modified (particularly stock), performs very close to the 'optimum' with 9V.

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Quote:
 Originally Posted by kaushama The GO-VIBE 5 (GV5) seems to have more advanced topology out of the two though. Its 3 channel topology with rail splitted virtual ground scheme. It supposed to give less distortion in ground channel. When given optimal voltage at least in theory it is supposed give more detail and resolution.The Xenos has a discrete power supply with virtual reference. It is based on pre-power 2 channel topology from the looks of the technical details. Isn't that so Andrea? If it is so your modded amp being more rich in SQ gives us another example of multiplication of channels does not sometimes give incremental results. Of course if you are not biased of your own MOD!!!
Exact! The Xenos is more traditional, but a solid design that is implemented very professionally, with great care for the details and without sparing components

Just a little clarification - my mod doesn't give a more rich sound merely (actually it seems to be the stock LMH6642 chips, from the datasheet to the actual listening, that "cool down" a little the OPA2134's own desirably rich and musical signature). It also gives more power, more detail/texture resolution, & thus more ambient detail, too; thanks to the higher performance (and much more expensive on the whole) chips.
Andrea I can find THS4051CD here. And AD8620ARZ too. LT1363 only available in DIPs. What do you think Leaving OPA2134 and replacing rail to rail drivers with THS4051? What is the signature of AD8620 compared to OPA2134?
I am going to ask Alberto whether he can provide me a version with DIP sockets or whether later I can only get the top PCB with DIP sockets!
The problem would be that adding DIP sockets in such a small pcb & entire amp should be a problem

Though the THS4051 undoubtedly is more suited for desktop 12V use than for battery use, powered with just +/- 5V these chips can output +/- 3.5V RMS on a 150 ohm load. So output swing isn't a problem. It's that being specified for +/- 5V or more, with an almost empty battery I don't know how they'd sound...

The AD8620 has both more texture and more resolution throughout (including bass) than the OPA2134, even more so at the lower supply voltages. In change the OPA2134 could be a bit thicker sounding & possibly more forward in the midrange. IMO the OPA2134 sounds just fine even with 9V - but the AD8620 is just better
Although it has three channels, GO-VIBE has only one buffer stage contrast to XENOS' PRE and POWER buffer stages. This along with more refined and discrete power supply may be catching up for the channel 3 layout!
I wonder, how Dr. XIN achieved discrete channels for PRE-left\right, POWER-left\right and ground channels separately! (Channel IV) Its advantage over PRE-POWER 2 channel topology, though appealing in theory, has to be tested in practice to see the benefits. Sometimes PCB layout, collection of parts and guarding against other interferences seems to be doing the trick.

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Head-Fi.org › Forums › Equipment Forums › Headphone Amps (full-size) › Best sub100\$ amp Xenos 0HA-REP? (with option of opamp rolling?)