Why does my IEM's sound better out of portable rig than via my desktop amp?
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Leicachamp

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Hello Guys.
 
I was hoping someone can shed light on why my Final Audio Fi BA SS and AKG 3003i sound so much fuller via my Iphone or AK100 than via my Desktop rig with Slee Solo Ultra Linear amp? The Slee has no noise issues with the IEM, in fact it is dead silent. It is said that it was designed with IEM usage. With all the IEMs it sounds quite lean. When using my Audeze or Fostex Headphones it sounds great with full tones!!!!!
 
Forgot to mention that my desktop rig consists of Lampizator transport and Lampi DAC going into the Slee. 
 
Do all IEM sound better via portable devices or portable amps?
 
The Slee Solo specs are
 

Specification

Headphone impedance range: 8 to 2,000 Ohms / 16 to 600 Ohms preferred

Power output: (rms, both channels fully driven at 1% THD)
32 Ohms: 140mW/channel; 600 Ohms: 30mW/channel


Input sensitivity (for specified power output into 32 Ohms): 511mV rms

Input impedance: 37k Ohms at max volume; 50k Ohms at min volume

Distortion: (THD plus noise at 9 o'clock volume control setting (qtr power))
10Hz-20kHz: better than 0.04%; 10Hz-1kHz: better than 0.02%


Frequency response (±0,-3dB) 10Hz - 35kHz

Output noise: (22Hz-22kHz, quasi-peak/un-weighted) -95dB

Channel balance: better than 1dB

Crosstalk: Left to Right -56dB; Input to Input -68dB

Input selector centre-off position: non-shorting; -38dB at max volume with 2V rms input (ref: 1kHz and 10kHz)

Output Stage: Bipolar class AB

Supply voltage: 24V DC unipolar

Size: (approx.) W: 107 x H: 50 x D: 185 (mm) inc. controls

 
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Mshenay

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synergy, it could be your iem just sounds better with a cheaper dac and or amp behind it, as the lesser expensive gear tend to have more coloration, where as in theory the more expensive gear should be more transparent 
 
either way, no each iem is different and never make any assumption about an iem or HEadphones sound quality without hearing it for your self, in this particular case your iem sounds better to you ears with your portable DAP, I'd just be happy with that and nJoy it! 
 
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