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post #316 of 442

Would the attenuator change the FR of IEMs with very low impedance (< 16 ohm) ? 

post #317 of 442
Quote:
Originally Posted by iFi audio View Post
 


Hi,

 

Good point! Some background.

 

 

The nano iCAN has been out since December and so has the nano iDSD.

 

 

What we under-estimated is that there are a lot of customers out there who retain the use of their high-sensitivity IEMs. These were ones they originally purchased for their iPhone/iPad and when they buy a headphone amp, they still largely stick with the same IEMs.

 

 

Just as a very simple example, the iPhone outputs 15mW. Any aftermarket headphone amp such as the nano iCAN puts out 150mW. This is 10x the power.

 

 

This is kind of mis-match gives rise to audible "hiss" and a volume control that hardly makes it past 9 o' clock. This of course is the same case with just about every headphone amplifier out there.

 

 

Hiss & low Vol Control = less than ideal.

 


 

So when our customers enquired with us about the "hiss" and we looked into this more, we found many used high-sensitivity IEMs with the nano iDSD/iCAN.

 

 

Our retailers suggested aftermarket attenuators but they replied that they dont have a good experience of the change in sound quality.

 

 

Rather than politely ask the customer to buy an alternative IEM/headphone, we offered to make the iFi Attenuators for them to use.

 

So we made a few prototype iFI Attenuators.

 

Then a few of you kindly posted your reviews of them here on Head-Fi and then the thing took on a life of its own. And here we are now!

 

Huge props for listening to, and evolving with the community of your customers. Much respect for this kind of business model. I can see that you guys will go very far. Maybe you guys can eventually look into making you own catalogue of headphones. Have you ever considered that?

post #318 of 442
iMatch

iLevel

iLoud

iConnect
post #319 of 442
Ifi Ator or Attor as short for ATTenuatOR
post #320 of 442

Id like to say... thanks very much for listening to your user base! I had an issue with an over sensitive headphone my self as well

 

And I just wish this was out back when I had the amp as I liked how it sounded with the headphone, minus the annoying hiss

 

how bout iSynergy 

post #321 of 442
Thread Starter 
Quote:
Originally Posted by pekingduck View Post

 

Would the attenuator change the FR of IEMs with very low impedance (< 16 ohm) ?


Hi,

 

Thorsten asked us to let you know that:

 

"The attenuator output impedance is low (3R for 12dB and < 1R for 24dB), inmost cases any changes will be very small, however some small changes may be expected.

 

For an IEM that varies from12 Ohm minimum to 64 Ohm maximum (just made up numbers) the resultant frequency response variation would be less than +/- 0.75dB for the 12dB Attenuator and less than +/-0.25dB for the 24dB attenuator.

 

While not quite "zero", these are ultimately quite low figures."

 

thanks

post #322 of 442
Thread Starter 
Quote:
Originally Posted by DJScope View Post

 


 

Huge props for listening to, and evolving with the community of your customers. Much respect for this kind of business model. I can see that you guys will go very far. Maybe you guys can eventually look into making you own catalogue of headphones. Have you ever considered that?


Thanks to you and the OPs who are glad that we admit we learn something new everyday. We have to respond to market dynamics.

 

 

Headphones?

Sorry. Very unlikely - we do listen to/muck around internally with quite a few different headphones. We have zero plans to bring out an iFi headphone. We work too closely with some headphone manufacturers and we prefer not to tread on their toes.

 

iFi skunkworks

Plus, we have WAY too many other things coming through....cant let the cat outta the bag yet!

 

The micro iDSD on the HF Crowd-Design thread is the next one and after that we're going back in time...;)

post #323 of 442

iWhisper

ClearWhisper
iHumming

ihumming-bird

post #324 of 442
Quote:
Originally Posted by iFi audio View Post
 


Hi,

 

Thorsten asked us to let you know that:

 

"The attenuator output impedance is low (3R for 12dB and < 1R for 24dB), inmost cases any changes will be very small, however some small changes may be expected.

 

For an IEM that varies from12 Ohm minimum to 64 Ohm maximum (just made up numbers) the resultant frequency response variation would be less than +/- 0.75dB for the 12dB Attenuator and less than +/-0.25dB for the 24dB attenuator.

 

While not quite "zero", these are ultimately quite low figures."

 

thanks

.75 db in frequancy reponse isn't what I would call low... .25 on the other hand is

 

what about for those of us using full sized headphones at 32ohms? 

post #325 of 442

iTRIM

post #326 of 442

Anything under 1dB is usually considered to be near imperceptible for most, I'll say that's a good number. The impedance is surprisingly low for sure, given 3 ohm is in the iPhone territory.

post #327 of 442
i-deTNT
iCOX (1 and 2) like painkillers smily_headphones1.gif
post #328 of 442
Or iCOX-12 and iCOX-24 smily_headphones1.gif
post #329 of 442

iBliss 

iZen 

post #330 of 442
Thread Starter 
Quote:
Originally Posted by Mshenay View Post

 

.75 db in frequancy reponse isn't what I would call low... .25 on the other hand is


 

what about for those of us using full sized headphones at 32ohms?


Hi,

 

Well, low is relative. In this case it was relative to unavoidable tolerances in transducers like headphones and to the frequency response of a typical headphone.

 

e.g. look here:

http://www.innerfidelity.com/content/headphone-measurement-proceedures-frequency-response

 

As to your second question, the example given with 12 Ohm minimum impedance and 64 Ohm impedance peaks is pretty much "worst case". Anything with higher impedance will see less variation.

 

thanks

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