Hi, Need some advice here. I'm currently shortlisted the following and not sure which is better, please help to take a look: Cambridge Audio Melomania 1 Klipsch T5 True Wireless Libratone Track Air+ Sennheiser Momentum True Wireless p.s. Sound quality is the most important factor to me.

I know that some have already asked if the adapter as such will affect the sound quality. (e.g. http://www.head-fi.org/t/647155/do-6-3mm-to-3-5mm-adapters-degrade-the-sound-quality) And I agree that there shouldn't be a difference, at least not an audible one, if the adapter is not an...

Is there any difference in sound quality when a DAP sourcing from its internal storage or sourcing from an external device, e.g a computer, as a DAC? In both case, the analog signals are processed by the same chip, so there should not be any difference. But is this really the case? Are there...

Thanks. I shall find more about the input op-amp. I get the part of switching between resistor for different gain, in a simplified physic point of view though lol. It would be great if they can include 1x option in all settings, isn't it, so that headphones that are very efficient and sensitive...

Thanks guys. By the way, I wonder what will the amplifier did to the signal if its set to 1x. I get the notion of having 1x option around that is to simply provide a low output impedance for some DAP or other source which has a relatively high output impedance. But if the amplifier amplified...

Hi,   I was going to order an O2 amplifier, not sure which to choose for the custom gain options.   Default gain levels of Objective2 is 2.5/6.5x. And there are another options as well, which is 1.0/3.3x and 1.0/4.5x. The 1.0/3.3x one is said to be optimal for 2.10VRMS DAC and the 1.0/4.5x...

Excuse me, but i still got some questions. If the amplifier can drive the headphone to a volume of even a deafening level, given that the output impedance of the amplifier, does it mean that amplifier is good enough for that particular headphone? I have read many articles claiming that, even...

Thanks for your reply. I understand the importance of amp when powering a high impedance headphone. But how about low impedance cans? Something can be driven with little energy. What makes a good amp to sound betterin these cases? I used to think with low impedance cans, there much less to gain...

Hi. I used to think DAC will have a bigger impact on how the music sound, as its after all where the digit convert to analog signal. But recently I have try to plug the headphone to line-out, where the analog signal hasn't been through the amplifier, and the music sound quite different than the...

I have considered that, but making shell cost a bit as well. And i think ciem manufacturer to better balance the acoustic effect of the canal of the shell maybe? Anyway, i think thats a good way to utilize the most out of a universal iem.

Thats very thorough, many thanks. If only any audiologist who made ear impression have that note, that would be great. I have noticed quite people in Hong Kong saying that their ear impression is badly done...i can only avoid making one by those audiologist...

Sure. I mean for making the ear impression, anything i should watch out for? I have watch a few videos about making a good ear impression. Just wondering if theres any way to determine whether the audiologist is good at it or not, before actually made one and found that the ciem need to be...

Thanks. Really appreciate your advice. I will try all the options before buying one. Btw, as a good ear impression is very important for making a ciem, anything i should note about that? I'm in Hong Kong and i Google some local place to do an impression. But it seems the service here varies in...

A3h seems to be a solid build. I shall give it a try. Thanks for the advice.

Thanks for the reply. Do you think 500usd is high enough? Though its somewhat a entry level for ciem.

Thanks for the advise man. I prefer a natural sounding headphone, maybe a little bit warm with a punchy bass, but not overwhelming one. I have the meze 99 classic sealed headphone(ya i know its hard to compare full-sizecan with iem) and i like that sound. Anyway, i shall do more research then...

Hi everyone.   I have been looking for a new IEM and I am choosing between a universal one or custom one.   So I have read that mostly CIEM will sound better than the universal in the same price range. It might somehow because CIEM provides better seals hence better response for various...

Unlike the wired one, the Bluetooth headphones(or speaker) received digital signals instead of analog signal. So the Bluetooth headphones will required a built-in DAC as well as an amplifier so as the process the Bluetooth-sent signals to the driver.   Here goes the part that confuses me. If...