[Whitigir]

Yes, the amp11 and amp12 can be used as single ended. You just need to buy Ibasso dongle

 

[NAD Fi]

The links do provide the answers. It's a matter of Ohm's law, solving for current and power.

Battery spec is 3.8 volts, 2000 mAh

AMP12 spec is 8.3v at 2000mA

So....Ohms Law Math (using milliamp/milliwatt values to keep it comparable)

Voltage (V) = 8.3 volts
Current (I) = 27.66667 mA (milliamps)
Resistance (R) = 300 ohms
Power (P) = 229.6334 mw (milliwatts)

The current needed is well under the rating of the battery. The P value tells us how well a 300 ohm load will be driven (hint: not too well at louder volumes)

The long and short of it is that 3.8 volts is not the battery rating.

 

[hartphoto]

The long and short of it is that 3.8 volts is not the battery rating.

You're saying iBasso's marketing materials and manuals for the DX300 and DX320 are wrong on quoting their battery specs?

 

[hartphoto]

Is the included Amp 11 mk2 amp balanced or does it just have 'balanced' outputs? I assumed it was the former, but it seems like they draw a lot of distinction about the Amp 12 being balanced in addition to Class A...

I am asking if there are separate +/- amplifier modules that are then summed 180 degrees out of phase at the load (balanced headphone). It's not that they don't share ground, they must have symmetrical current return paths.

Then, no, it is just a balanced connector.

Based on the AMP11mk2 product description....it's based on the AMP8 circuit design. Maybe this will help iBasso AMP8

It'd be nice if iBasso would be consistent in the materials about the various amp design. It's like the AMP11mk2, AMP12, and AMP13 details were written by 3 different people.

It's one thing that's nice when reading about Cayin's designs. Several of us have the Cayin RU6 dongle/dac....it's introductory page has ample scrolling material explaining the various designs it uses, including exactly how they achieve the balanced (not completely) output.

We're flooded with info if you follow the Schiit products. Block diagrams, thought processes, paragraphs upon paragraphs of design info....more than just bullet points.

 

[Altes]

Just lurking: I demoed the DX320 at Audio46 with @Terco and I was blown away...Put my M8 up for trade, but no bites yet....

Which amp card did you demo the DX320 with?

 

[NAD Fi]

You're saying iBasso's marketing materials and manuals for the DX300 and DX320 are wrong on quoting their battery specs?

It comes back to what I initially speculated that iBasso is quoting stock Amp 11 voltage draw and the battery has more to give. Voltage dividers can be used on amp cards to step down the voltage. If Amp 12 needs 8.3 volts the battery has to be capable of that output, it is Kirchoff’s law .

 

[szore]

Which amp card did you demo the DX320 with?

I dont remember, paging @Terco

 

[Terco]

11mk2s

 

[Whitigir]

11mk2s

Definitely a stock dx320 module

 

[hartphoto]

It comes back to what I initially speculated that iBasso is quoting stock Amp 11 voltage draw and the battery has more to give. Voltage dividers can be used on amp cards to step down the voltage. If Amp 12 needs 8.3 volts the battery has to be capable of that output, it is Kirchoff’s law .

I'm tempted to crack open my DX320 (but it's still under warranty), and/or possibly destroying an IEM to show this. The iBasso DX300/DX320 batteries will measure 3.8V DC.

iBasso marketing materials are not consistent with labeling specs.The output specs that iBasso gives for the AMP12 is 8.3VRMS @2000mAh.

VRMS is root-mean-square voltage. It is an AC value, not DC. Hook up an oscilloscope on the leads to your favorite IEM/headphone. This is where (in VRMS mode), you'll measure (at max volume) the 8.3VRMS specification.

The specification of 2000mAh is also not always consistent in the labeling. Sometimes it's shown as 2000mAh, sometimes shown as a max of 2 amps. Same value.

edit to add: VRMS can also be measured on newer/advanced digital multimeters if they have the capability (typical multimeter does not). Remember this is an AC value (even when shown as a decimal). As much as I'd like to fire up my Tektronics 465m Oscilloscope to show this.....there's not the time. Measuring the 3.8V DC battery spec can be done with most any multimeter.

 

[krzysztof4101997]

https://www.audiophile-heaven.com/2...FL5KAiu8y38TVOox_ucXHWd7Ku_coYFZ3rXytBJYKRz20

 

[DAPpower]

Aside from just upgrading my U12T cable (Eletech) I just installed the JVC Spiral Dots++ eartips (M) and wow, the sound has changed a lot for the better, there is stronger mid bass and more bass control, the whole spectrum seems to be further balanced now.

Now all I need is one of those EXN-S 2 and I will be satisfied for the next year or so.

 

[DAPpower]

Alright gang,

I made a mistake earlier, there is no EXN-S 2, there is the new EXN 2 just released on the website which is pretty much the same amp but without the Solen Silver component (he found a cheaper replacement that sounds pretty much identical)

Now regarding the ADA4625 op amp on the new EXN 2, Steve has done a battery test and he has this to report,

" p.s. I tested my DX320 with a AMP12EXN2 4625 for battery usage.

Charged both analog/digital batteries to 100%

Played back via neutron
Fixed to 768khz etc (Digital battery so irrelevant for the test)
Medium gain
51% Neutron volume (so 32/63)

The analog battery lasted 6 hours (5 hours 56 minutes)
The digital battery had 29% left (next to no screen time and zero wifi/bluetooth time)

Any increase in mA draw over the unknown stock opamps from the ADA4625-1 is 4 fold due to 4 chips being used.

This will be less of an impact using 2 x ADA4625-2 on an AMP11 "


Not the worst result‌, the op amps will certainly improve dynamics further and you may end up with 5-6 hours on medium gain which is reasonable considering the sound you will be getting on a portable device.

EXN 2 is out, so I will be purchasing one very soon!

 

[Whitigir]

Alright gang,

I made a mistake earlier, there is no EXN-S 2, there is the new EXN 2 just released on the website which is pretty much the same amp but without the Solen Silver component (he found a cheaper replacement that sounds pretty much identical)

Now regarding the ADA4625 op amp on the new EXN 2, Steve has done a battery test and he has this to report,

" p.s. I tested my DX320 with a AMP12EXN2 4625 for battery usage.

Charged both analog/digital batteries to 100%

Played back via neutron
Fixed to 768khz etc (Digital battery so irrelevant for the test)
Medium gain
51% Neutron volume (so 32/63)

The analog battery lasted 6 hours (5 hours 56 minutes)
The digital battery had 29% left (next to no screen time and zero wifi/bluetooth time)

Any increase in mA draw over the unknown stock opamps from the ADA4625-1 is 4 fold due to 4 chips being used.

This will be less of an impact using 2 x ADA4625-2 on an AMP11 "


Not the worst result‌, the op amps will certainly improve dynamics further and you may end up with 5-6 hours on medium gain which is reasonable considering the sound you will be getting on a portable device.

EXN 2 is out, so I will be purchasing one very soon!

And that is why I have always loving the idea of separated battery where analog battery lasts longer than digital. Now with this, the Amp12 is taken further. I will want to get an Amp12AD-F soon, by adopting this ADA implemented by Steve

 

[DAPpower]

Also, I'm soft-pinning this AMP12 and AMP11 Muse mods impressions by @Maxx134 for everyone to see.

https://www.head-fi.org/threads/dx3...1st-page-new-fw-2-03-855.962274/post-17074100