I haven't seen anything on T series from iBasso for a while so I emailed them a while back asking if there was anything new coming up in the offing. I heard back today that they have the T5 coming out in a few days with an all new custom case, totally new design with a balanced ground system. Sounds exciting for the ultra small portable amp arena. I asked them for specifications. Here are some specifications; As mentioned there is a balanced ground system or BTL ground. The voltage swing has been increased from 4.2V to 8.4V with output power at 175mW into a 32ohm load. It has a digital volume control that has no right or left imbalance. The top and bottom of the case is stainless steel with an alloy middle section. It has 8 OPAMPs with a total of 12 ICs in a case that is, 81mm by 41mm by 10mm thick. Play time is 20 hours. Power Source：Built-in 4.2V Li-polymer Batteries or external power supply Frequency Response: 10Hz~100 KHz +/- 1dB Signal to Noise Ratio：-104dB Output power：Up to 175mW+175mW into 32Ω Gain: 0dB/ +7dB Battery Life: 20Hours Battery Charge Time: 2 Hours External Power supply: 5V DC Recommended Headphone Impedance: 8~300Ω Wt. 32g edit: October 29, 2011 I have a little over 100 hours now on the T5. The sound has gone through stages, when compared to the output of the iRiver for differences rather than relying on memory of how they sounded different. At this point the T5 has opened up quite a bit, showing excellent transparency and detail. The high frequencies are a little surprising to me as I didn't know when way they would go. The highs are very natural and open. The bass presentation is stronger than the past T models. It is not an emphasis that drifts into the lower mid but you can tell there is power behind it. The low end also seems to go lower. I can tell that this T has advanced, which is what new models are supposed to do but many times end up as just a variation rather than a true step up. I am still not unhappy with the T3, but I can tell that the T5 is more powerful and conveys the music with this solid platform behind it. The T5 needs many hours to fully burn in. It has 470uf X8 in caps. Amazing that they got those in there but they take some time to form and so I just leave the unit playing much of the time with it being turned off from time to time. I will say that as 200 hours approaches, it has opened up much more than where it was at 120 hours. It was more open at around 20 hours than it was at 120 and now it is more even across the frequency range. This while comparing to another amp for reference from the same source so as to not rely on aural memory. 11/05/2011 Listening to "Sailing to Philadelphia", Mark Knopler, the sound just resonates through my body. The bass is so profound and yet controlled and totally integrated and integral. This amp is really starting to come to life now. Interesting.