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iBasso P3+ Hiss?

post #1 of 9
3/19/10 at 5:55am
Thread Starter 
My current setup is an ipod classic with ibasso p3+ amp and a pair of ultrasone pro 900 headphones. The amp however gives off noticeable hiss in the right ear of the headphones at whatever volume, which disappears when it is plugged into the mains. Is there are way to get rid of the hiss as it is extremely annoying.
Thanks.
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post #2 of 9
3/19/10 at 7:23am
just in case, you tried changing the batteries?
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post #3 of 9
3/19/10 at 12:26pm
have you tried swaping the L/R opamp? maybe you´ve got one (a defect one) in your amp that doesn´t like low voltage.

neopac (hiss-free with 2*AD797/2*IBasso Buff/2*Dummy)
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post #4 of 9
3/19/10 at 1:12pm
Thread Starter 
how do i go about swapping opamps? i bought the amp second hand with opa627 installed, but it all looks a bit daunting to me when i open up the amp.
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post #5 of 9
3/19/10 at 1:53pm
P3+ Manual
have a look at the manual it should resolve most questions

neopac
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post #6 of 9
3/20/10 at 4:36am
i noticed that when i auditiond an iBasso D4 as well. is this normal for all iBasso amps?
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post #7 of 9
3/20/10 at 7:35am
Quote:
Originally Posted by john11f
i noticed that when i auditiond an iBasso D4 as well. is this normal for all iBasso amps?
as i stated mine is hiss "free" and i don´t think IBasso would get this great reputation if it´s prerequisite that they have one channel hissing as hell ... but they are by design "toy-around-opamp-rolling" amps and i think it could be possible that alot of people screw up something by testing things ... static charge is something to consider for example.

neopac
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post #8 of 9
3/20/10 at 1:00pm
My P3+ hissed a lot till I changed the OPAMPs for iem use. Now it is very quiet (nearly silent) and great sounding for iems. Buff are 634 BB and LR is 2111.
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post #9 of 9
3/20/10 at 1:20pm
Quote:
Originally Posted by cears View Post
how do i go about swapping opamps? i bought the amp second hand with opa627 installed, but it all looks a bit daunting to me when i open up the amp.
FWIW, the OPA627 is operating right on the lower end of the voltage range in the P3+. I would suggest using a fresh set of quality AAA alkaline cells and see if the hiss disappears. If that doesn't help, try an OPA1612 or TLE2142. They both exhibit little, if any, hiss and can comfortably work at the P3+ supply voltage.
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