[mendiola]

I have a lm4880 headphone amplifier and I want to know if a cmoy with an opamp opa2134 will sound better than a lm4880 or a TPA152 chips ?

 

[ClieOS]

Too broad a question, I think, since performance is not just about the chip but also the overall implementation. The only answer I can give is that I do prefer cmoyBB (OPA2227) over PA2V2 (Boomer series IIRC). Maybe on par if cmoyBB is with OPA2134.

 

[jseaber]

I have a lm4880 headphone amplifier and I want to know if a cmoy with an opamp opa2134 will sound better than a lm4880 or a TPA152 chips ?

 
Chipamps like LM4880 or TPA152 are intended for driving small speakers. THD+N and SNR will be quite high. Minimum gain is usually 10x or greater. This is all fine for speakers; not good for headphones.

 

[SilverEars]

Hi, is there any way to customize the CMOY gain to make it with no hiss, and just black for iems of 119 dB sensitivity?

 

[jseaber]

  Hi, is there any way to customize the CMOY gain to make it with no hiss, and just black for iems of 119 dB sensitivity?

 
With 119dB/mW IEMs, it's difficult to achieve a completely black background with any amp. You can get close. Good ears may still detect hiss in a quiet ambient setting.
 
To answer your question, gain can be reduced as low as possible (2-3x for a cMoy), and smaller gain resistor values will improve the noise floor.