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JUST IN: iBasso P3 Heron Hi-Resolution Pictures *drool* - Page 2

post #16 of 27
Thread Starter 
Quote:
Originally Posted by Podtweaker View Post
Well ,it looks like he has to put things back together first.(he,he,he). That battery compartment configuration is a bit different isn't it ? I would say to make sure you take your time every time you re-install a battery so that you have some control over the wear of the contacts(which may not really ever be an issue,but it doesn't hurt to be aware of how things fit) As mentioned by others ,nice job on the pics.
I felt that the spring contact assembly was rather flimsily soldered onto the main board but after some tugging and pushing realized that it was actually quite sturdy and durable.

However the springs are indeed very rigid and I wonder what impact this would have on the soldered area.

Furthermore, it *is* difficult to fully clamp the lid with your fingers without the help of screws because the springs are sooo strong!
post #17 of 27
EXIF bro. EXIF

UM2 hiss with almost all DAP due to it's high sensitivity.

btw, regarding the spring contact, it might not pose serious damage to main board in long run if sudden impact inflicted (eg. drop), it might just snapped off.

anyway, amp is all about SQ imho. build quality and look come second.
post #18 of 27
EXIF has had a hand in revealing much more than just what camera someone was using...

That silvery grey 'iridium' finish is absolutely stunning though. Very cool.
post #19 of 27
Nice pics

Hope some new owners can comment on the hissing issue
post #20 of 27
i'll buy it, just thinking if it would be a really upgrade since i'm using shure s530.
post #21 of 27
Quote:
Originally Posted by insyte View Post
Nice pics

Hope some new owners can comment on the hissing issue
I finally bought P3 from local store yesterday and rolled the op-amps immediately with following configuration:

L/R: LTC6241HV x1 replaces AD797 x2
Buffer: Transistor buffer x2 replace dummy adapter x2
3/4 Channel: Original LM6172 x1 (to be replaced with other op-amps)
Gain Jumper: Original 10db high setting

This configuration has been tested with iPod nano and following headphones. No hissing has been detected at all so far (completely silent when music playing on iPod is paused) regardless of power source (either from AC adaptor or batteries). You should check the installed op-amps whenever there is hissing and locate noise source through isolation.

V-Modal Vibe
Audio Technica ESW9
AKG K601

With 6 AAA Sony Eneloop rechargable batteries and volume control set to full scale, sound level become unbearable even with AKG K601 headphone. This is the first time I have experienced such driving power from a portable headphone amplifier.
post #22 of 27
Thread Starter 
Quote:
Originally Posted by littletree76 View Post
I finally bought P3 from local store yesterday and rolled the op-amps immediately with following configuration:

L/R: LTC6241HV x1 replaces AD797 x2
Buffer: Transistor buffer x2 replace dummy adapter x2
3/4 Channel: Original LM6172 x1 (to be replaced with other op-amps)

This configuration has been tested with iPod nano and following headphones. No hissing has been detected at all so far (completely silent when music playing on iPod is paused) regardless of power source (either from AC adaptor or batteries). You should check the installed op-amps whenever there is hissing and locate noise source through isolation.

V-Modal Vibe
Audio Technica ESW9
AKG K601

With 6 AAA Sony Eneloop rechargable batteries and volume control set to full scale, sound level become unbearable even with AKG K601 headphone. This is the first time I have experienced such driving power from a portable headphone amplifier.
Thanks for posting your observations!

Anyway, since changing the AD797 opamps the noise floor is almost non-existent.

Do you experience hissing with dual AD797 opamps with your IEMs?
post #23 of 27
Quote:
Originally Posted by lucifix View Post
It cost US$179 plus about $20 shipping.
That's remarkable considering they've included a second case, the extra op-amps and other bits & pieces that would have been further cost from another maker. Very good value for money.
post #24 of 27
Quote:
Originally Posted by lucifix View Post
Thanks for posting your observations!

Anyway, since changing the AD797 opamps the noise floor is almost non-existent.

Do you experience hissing with dual AD797 opamps with your IEMs?
To confirm the noise issue once and for all and to find out why iBsso has choosen AD797 as default, I reinstalled two AD797 opamps in L/R sockets with two transistor buffers in buffer sockets and one default LM6172 in 3/4 socket. Note I need current output of transistor buffers to drive AKG K601 instead of using default dummy adapters. The gain remained as default 10dB high setting. iPod nano was connected to P3 through LOD all the time. The test was performed with my only IEM V-Modal Vibe (::: v-moda :::) with sensitivity of 92dB.

With 9V DC power adapter as power source (all batteries removed) and iPod turned off, humming noise (rather than hissing) was prominent even more so when volume was increased from zero to full scale. With 6 AAA rechargable batteries as power source under same condition (iPod off and volume adjusted from minimum to maximum), no noise at all until iPod was turned on (in pause state) and volume was increased to full scale (hissing rather than humming).

I suppose the humming noise was caused by ground loop and hissing was caused by noise from iPod. If you touch metal casing of P3 with DC power adapter connected, you should notice increase of humming noise. When batteries are used as power source, no ground loop can be formed thus there was no humming noise at all. Hissing noise originated from iPod (turned on) was amplified by P3 when volume had increased pass 90% of full scale. But with sensitive IEM, no one can listen at such high volume. Further more hissing noise was not noticable when music was playing.

Thus conclusion is AD797 works fine with sensitive IEM when batteries are used as power source. The gain setting can be lowered to 3dB to minimize hissing noise originated from portable player. Gound loop (humming noise) is inevitable whenever 9V DC power adapter is used regardless of what opamps are installed. You may want to hunt for 9V DC power adapters designed to break the ground loop at outputs. I would rather have iBasso not bundle any power adapter of questionable quality and lower the price of P3.
post #25 of 27
Quote:
Originally Posted by lucifix View Post
Thanks for the comments guys.

I haven't been given a chance to fully listen to them but first impressions are that they are not as silent as my Viper.

Don't know why but I've been experiencing this ****ty hissing and shrill whistling sound when moving the volume pot and it is a pain in the ass. I am rather mad at this and would probably shoot iBasso an email to see why is this happening and if any other buyers have experienced the same problem.

Apart from the silly sounds, the Heron is sounding mighty fine. I didn't know music could sound any better than my Viper! The bass is much more defined in the sense that you can really feel the THUMPH but not to the point of being too bassy. The soundstage also seems wider but I am not too definite of that at the moment.

Can any other Heron owners comment on the hissing issue? It is especially pronounced when I am using it with my UM2's and not so much with the KSC75, I am thinking this is because the UM2 is of lower impedance but I may be wrong.



That's just creepy, how did you know what camera I was using?!
I bet he looked up your photo's EXIF data or something....

BTW.... HOW AWESOME is the P3 HERON?? I have an iBasso T4, and am considering hurting my wallet with an upgrade. How is the size of the P3? what is the maximum ohm that it will drive? can it drive 600 ohm cans? like the beyerdynamic DT770??

I'm considering forcing myself to afford those puppies.
post #26 of 27
Quote:
Originally Posted by FLACvest View Post
I bet he looked up your photo's EXIF data or something....

BTW.... HOW AWESOME is the P3 HERON?? I have an iBasso T4, and am considering hurting my wallet with an upgrade. How is the size of the P3? what is the maximum ohm that it will drive? can it drive 600 ohm cans? like the beyerdynamic DT770??

I'm considering forcing myself to afford those puppies.
P3+ has come out.
post #27 of 27
That looks like such a simple circuit with few components on the circuit board. Can you take more pictures of the top and bottom of the circuit board, with and without opamps and buffers plugged in? (Or just without) I wonder how hard it is to emulate something like that DIY - getting the fit and finish of the case would be hard but it doesn't really look like there's many components to it.
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