Without more information it is JUST a guess; but from the fact that when the one has issues, then after that the second one does funky stuff, it sounds almost like a ground issue. It could be as you say an issue with both female MMXC connectors.
If they are too loose in there it might also cause this, which can be fixed with a flat-head screwdriver (in most cases). Here is a video and tutorial on how to fix that issue (if it is because it is loose).
Did this to my left mmcx connector, it was much harder to push in the mmcx . But once i did, I can still spin around the earbud 360 degree easily.
However, 30mins in, I haven't face the issue I mentioned.
I'll observe for abit longer but hope this fixes the issue, thanks!
Did this to my left mmcx connector, it was much harder to push in the mmcx . But once i did, I can still spin around the earbud 360 degree easily.
However, 30mins in, I haven't face the issue I mentioned.
I'll observe for abit longer but hope this fixes the issue, thanks!
Ok
Happy hardcore music, source Huawei 8x phone
I usually listen without attachments. I like the sound of the ksk300, I think it's a V-shaped sound with a good middle.
Ok
Happy hardcore music, source Huawei 8x phone
I usually listen without attachments. I like the sound of the ksk300, I think it's a V-shaped sound with a good middle.
Ok
Happy hardcore music, source Huawei 8x phone
I usually listen without attachments. I like the sound of the ksk300, I think it's a V-shaped sound with a good middle.
The package with the buds is a little delayed, I expect it should arrive in 3 days.
In the meantime I will share my impressions of PT2021 365Ω vs Zen LL.
Took some quick measurements of my new K's LB copper cable w/mic (2021 build date/serial) vs my K's LB white with what appears to be SPC cable (2020 build date/serial).
8k spike is coupler resonance. 1k normalization.
Originally I was looking to see if the mic cable caused any major channel imbalance... I found it did not.
I don't have too much experience with portable amps, the RAP (version unknown) is the only one I have so got nothing else to compare it to. But it seems quite neutral, it does not appear to color the sound.
In the case of driving the Zen Lite (300Ω), the volume knob has a starting position at 7 o'clock, for normal listening, the 9 o'clock position should be fine for most music. For a few of my very quiet classical recordings I only need to push it to 11 o'clock.
My only complaint is that the amp is on the bulky side, if you look at other portable amps from Fiio, they look quite slim at half the height. And if you have the Warp Core then the height is doubled when they are stacked together.
RUNABOUT(RA) is Venture Electronics' first portable amp. It is a classical OP + BUF design with two gain settings (Low Gain=3.4X, High Gain=5.7X). The output voltage swing is 3V RMS. Driving 32ohm@ 150mW and 300ohm@ 55mW, it is designed to work with most dynamic driver based earphones and headphones.
RA uses a single 9V battery (6F22 type), DC to DC voltage boost, replaced by a virtual grounds / 3 channel headphone amp design. This is a very classic design and has been implemented in many successful amps from various established brands. While using TLE2426 as the power managing chip, we chose BUF634 to be RA's buffer & isolation chip. Not only it can effectively solve the capacitive load caused by self-excited oscillation and related issues, it also became the solid foundation of the implementing high-current OP / BUF for the amp section.
The amp section consists of 2 x JRC4556AD, a low voltage, high output current OPA chip. Along with its input stage BJT design (similar to more popular OPA chips like OPA2604, OPA2132, etc.), this design offers less background noise and increased stability with low impedance audio source. RA uses a large negative feedback loop, and resistors are added between the OPA chips to regulate and isolate the current. The added bead design in the output section further ensures its stability.
The Warp core can not be charged and power the Amplifier in the same time. It will damage the battery. Please use the DC to power Amplifier when you charge the Warp core.
Model： RunAbout Plus Connector Complement： 1×3.5mm stereo jack for Input 1×3.5mm stereo jack for Output 1×DC005 power jack for DC adapter Frequency Response： 20Hz-20KHz，±0.3dB Maximum Current Output： 0.07A Maximum Voltage Output： 2.6V RMS/5.3V RMS（with 16.8v warp core {external rechargeable battery pack} ） Maximum Power Output，32ohm： 150mW RMS per channel/150mW RMS per channel(with 16.8v warp core {external rechargeable battery pack}) Maximum Power Output，300ohm： 20mW RMS per channel/90mW RMS per channel(with 16.8v warp core {external rechargeable battery pack}) Maximum Power Output，600ohm： 10mW RMS per channel/50mW RMS per channel(with 16.8v warp core {external rechargeable battery pack}) THD： ≤0.05%，20Hz-20KHz，1V RMS IMD： ≤0.06%，1V RMS SNR： ≥94dB，1V RMS，unweighted，gain=10.5dB Crosstalk： ≥90dB，20Hz-20KHz Output Impedance： 0.7ohm Gain： 3.35（10.5dB），5.7（15.1dB） Topology： OP+BUF，precision virtual ground reference，isolated power supply Power Supply： 1×9V 6F22 Battery，or 18V DC adapter Power Consumption： 0.072W Size： 4.33×2.83×1.06（in） Weight： 200g（without battery）
I don't have too much experience with portable amps, the RAP (version unknown) is the only one I have so got nothing else to compare it to. But it seems quite neutral, it does not appear to color the sound.
In the case of driving the Zen Lite (300Ω), the volume knob has a starting position at 7 o'clock, for normal listening, the 9 o'clock position should be fine for most music. For a few of my very quiet classical recordings I only need to push it to 11 o'clock.
My only complaint is that the amp is on the bulky side, if you look at other portable amps from Fiio, they look quite slim at half the height. And if you have the Warp Core then the height is doubled when they are stacked together.
RUNABOUT(RA) is Venture Electronics' first portable amp. It is a classical OP + BUF design with two gain settings (Low Gain=3.4X, High Gain=5.7X). The output voltage swing is 3V RMS. Driving 32ohm@ 150mW and 300ohm@ 55mW, it is designed to work with most dynamic driver based earphones and headphones.
RA uses a single 9V battery (6F22 type), DC to DC voltage boost, replaced by a virtual grounds / 3 channel headphone amp design. This is a very classic design and has been implemented in many successful amps from various established brands. While using TLE2426 as the power managing chip, we chose BUF634 to be RA's buffer & isolation chip. Not only it can effectively solve the capacitive load caused by self-excited oscillation and related issues, it also became the solid foundation of the implementing high-current OP / BUF for the amp section.
The amp section consists of 2 x JRC4556AD, a low voltage, high output current OPA chip. Along with its input stage BJT design (similar to more popular OPA chips like OPA2604, OPA2132, etc.), this design offers less background noise and increased stability with low impedance audio source. RA uses a large negative feedback loop, and resistors are added between the OPA chips to regulate and isolate the current. The added bead design in the output section further ensures its stability.
The Warp core can not be charged and power the Amplifier in the same time. It will damage the battery. Please use the DC to power Amplifier when you charge the Warp core.
Model： RunAbout Plus Connector Complement： 1×3.5mm stereo jack for Input 1×3.5mm stereo jack for Output 1×DC005 power jack for DC adapter Frequency Response： 20Hz-20KHz，±0.3dB Maximum Current Output： 0.07A Maximum Voltage Output： 2.6V RMS/5.3V RMS（with 16.8v warp core {external rechargeable battery pack} ） Maximum Power Output，32ohm： 150mW RMS per channel/150mW RMS per channel(with 16.8v warp core {external rechargeable battery pack}) Maximum Power Output，300ohm： 20mW RMS per channel/90mW RMS per channel(with 16.8v warp core {external rechargeable battery pack}) Maximum Power Output，600ohm： 10mW RMS per channel/50mW RMS per channel(with 16.8v warp core {external rechargeable battery pack}) THD： ≤0.05%，20Hz-20KHz，1V RMS IMD： ≤0.06%，1V RMS SNR： ≥94dB，1V RMS，unweighted，gain=10.5dB Crosstalk： ≥90dB，20Hz-20KHz Output Impedance： 0.7ohm Gain： 3.35（10.5dB），5.7（15.1dB） Topology： OP+BUF，precision virtual ground reference，isolated power supply Power Supply： 1×9V 6F22 Battery，or 18V DC adapter Power Consumption： 0.072W Size： 4.33×2.83×1.06（in） Weight： 200g（without battery）
Excellent! This is the info that Lee refuses to share with me. I wonder why?
My current favorite amp for high impedance buds is E1DA PowerDAC, which is a completely different design being fully digital. It is also about 30% of size and weight of the RAP.
The PowerDAC sounds great, so I wonder if I would possibly like the RAP sound even more...
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