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iBasso D42 "Mamba" with dual dacs! !! Hey Hey! Improved Starting on Page 76 . - Page 29

post #421 of 1153
Yes Sir, know someone who have one. will test it out.

Quote:
Originally Posted by HeadphoneAddict View Post
Let us know how that sounds with HD600/650 or 600 ohm AKG or Beyer someday.

After some discussion and reading about oscillation, I hook up the D4 with LT1028 to my scope. Bang on, Oscillation is found.
How I realize why it does not sound right. Reading the spec sheet, I realize the correct part should be LT1128 instead of LT1028.
The D4 is non operating in non-inverting mode with gain of 1 or 2.

I think I my wallet will leave me very soon. I problem many in this forum share.
post #422 of 1153
What about RF shielding? When my iPhone is near to my D3 Python, I have very heavy buzz from my iPhone. Listening via IEMs it's much louder than the music up to 1 m distance between D3 and iPhone.

Is this fixed with the Mamba? Otherwise I'm going to look for alternatives such as Pico, Predator or maybe for home even the Audio-GD Fun?
post #423 of 1153
Quote:
Originally Posted by arctic_storm View Post
What about RF shielding? When my iPhone is near to my D3 Python, I have very heavy buzz from my iPhone. Listening via IEMs it's much louder than the music up to 1 m distance between D3 and iPhone.

Is this fixed with the Mamba? Otherwise I'm going to look for alternatives such as Pico, Predator or maybe for home even the Audio-GD Fun?
Does this happen with the phone in airplane mode as well? Or with 3g signal (if you have a 3g/3gs phone)?

I'm looking at getting a D4 but if it's going to buzz like hell with my iphone even in airplane mode, I'm gonna have to pass. I have noticed buzzing with my 3g when hooked up to the car (ferrite beads work wonders here on the cable - they should work for portable/regular amps too -- put one or two on the LOD cable) and near other speakers and stuff, but only when it's using the edge signal. Never in airplane mode or with a 3g signal. It's something about the edge signal.
post #424 of 1153
Actually I've got the D3 Python and with my iPhone I have buzzing like hell (but just every 15 minutes or so for some secounds). In airplane mode there is no buzzing, but with disabled 3G only (EDGE/GSM still active) buzzing problem is still there. Unfortunately at home there is no 3G available.

The D3 Python is known for very strong RF interference, but I haven't found anything about the D4 Mamba. Pico should have very low buzzing, so this maybe would be my alternative.
post #425 of 1153
I get no RF interference on my D4 with my 3G phone right next to it.
post #426 of 1153
My iPhone 3GS in a Mophia Juice Pack Air battery case with 3G and WiFi on has been sitting on top of my D4 with OPA1611 class-A biased opamps for a while as I listen to music, and I haven't heard any buzz from it yet. It might have had mild buzz with the stock opamps but I don't remember now since I have had the new opamps in for a while.
post #427 of 1153
Larry, so is D4 your ideal portable amp
post #428 of 1153
Quote:
Originally Posted by kunalraiker View Post
Larry, so is D4 your ideal portable amp
Other than being bigger than my P-51 with less battery life, Yes. With the D4 topkit installed I think it performs and sounds similar to the P-51, but with a DAC that competes well with the high resolution of the Pico's DAC (the P-51 doesn't have a DAC).

If money was not an issue, the P-51 combined with a Pico DAC and high quality mini-mini cable might be my first choice, but at 3-4x the cost for just a small percentage increase in performance most people wouldn't think it was worth it. This way you could leave the DAC behind and use the smaller amp with iPod, and it would run 5-7x longer on battery.
post #429 of 1153
Quote:
Originally Posted by HeadphoneAddict View Post
Other than being bigger than my P-51 with less battery life, Yes. With the D4 topkit installed I think it performs and sounds similar to the P-51, but with a DAC that competes well with the high resolution of the Pico's DAC (the P-51 doesn't have a DAC).

If money was not an issue, the P-51 combined with a Pico DAC and high quality mini-mini cable might be my first choice, but at 3-4x the cost for just a small percentage increase in performance most people wouldn't think it was worth it. This way you could leave the DAC behind and use the smaller amp with iPod, and it would run 5-7x longer on battery.
Well said Larry

P-51 comes out as a winner.
post #430 of 1153
Quote:
Originally Posted by HiFlight View Post
I get no RF interference on my D4 with my 3G phone right next to it.
Quote:
Originally Posted by HeadphoneAddict View Post
My iPhone 3GS in a Mophia Juice Pack Air battery case with 3G and WiFi on has been sitting on top of my D4 with OPA1611 class-A biased opamps for a while as I listen to music, and I haven't heard any buzz from it yet. It might have had mild buzz with the stock opamps but I don't remember now since I have had the new opamps in for a while.
Thanks, guys, you have convinced me. I've just ordered the D4 Mamba and I hope it to receive here (Germany) soon. Maybe the Mamba will fix all small problems I'm having with the D3 Python right now (mainly RF interference and noise at the beginning of the volume pot - when the noise is gone, the D3 Python is nearly too loud for in-ear monitors).
When it's just nearly as good as the Pico is told to be, the Mamba is a great offer, I will report about my experiences and impressions later in the appropriate topic!
post #431 of 1153
I have not heard any interference either when using my D4 close to my iPhone.
post #432 of 1153
I really wanna buy the D4. Everyone is writing positive reviews and impressions. The DAC section is a no-brainer, but I can't stop thinking about the short battery life with the 9v battery. 9-10 hours isn't really cutting it when used on the go, especially when one is used to the T3
And locally here in Stockholm, Sweden I can't seem to find any other rechargable battery than a 200mAh and I guess that means even shorter battery life than 9 hrs.
post #433 of 1153
My battery just died few minutes ago

I use alkaline, this is my first battery and it lasted me about 10 hours.
post #434 of 1153
Before I pull the plug on the D4 or the D10 for that matter is there anyone pairing it with an IE8 that'd like to share their impressions. The D10 or P3 + IE8 seems to be a well established safer route. However, am at the point where am thinking What If the D4 may pair better for a slightly lower price to boot. My Alo Rx just adds volume while the Voyager just overpowers the bass as if I needed more. The possibility of OP amp rolling to tailor the sound for the ibassos is enticing. My ears will be the judge but any conjectures/reassuracne, or impressions would be welcomed.
post #435 of 1153
Just to clarify, I'm particularly worried about buzzing/GSM interference while using my iphone as the source (not just having it near the amp).

I've had this problem with the iphone before, with other amps and stuff, but only when using edge. The problem has never occurred for me in 3g mode or in airplane mode. Also, ferrite beads eliminated the problem for me with edge as well.

It sounds like the problem is at least solved by using airplane mode, if nothing else, which is fine with me. I just wanted to make sure it wasn't a different interference problem that didn't deal with the radios in the phone.
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