iQube V1 Portable Headphone Amp

i-Qube Details

Lightweight, portable Headphone amplifier
High efficiency (90-95%) Class D amplifier
Runs on 4x AAA alkaline or rechargeable batteries, user replaceable
8-fold output buffer for a (near to) load independent output behavior
4th order feedback loop for minimum distortion
Fixed, phase-shifted carrier wave oscillator decreases inter-channel distortion
Ultra low noise front end accepts any line level source without the need for impedance matching
Top A-grade components used:
Medical graded double layer epoxy using HOFC (High Oxygen Free Copper)
Optimized board design enhances signal quality
Alps potentiometer
Vishay series 036 decoupling capacitors throughout
Panasonic stack film capacitors
Carbon signal resistors
Lumberg I/O connectors
Fully RoHS compliant
Retro art design, CNC machined aluminum casing
Rubber touch feel painted covers 

6Moons Review. Click image

Playback Review. Click image

The first reaction has been posted on iPod studio forum, you can read it here.

The first review on Head-Fi-org, read all about it here.

A very elaborate thread on portable amplifiers by a distinguished forum member (Skylab) and a iQube review here.

A review on Head-Fi.org, read all about it here.

Another review on head-Fi.org, you can read here all about it.

Quotes from different visitors of the Head-Fi meet in Chapel Hill NC:

“The iQube was very impressive and a real winner for me. Its imaging astonished me and the sound was not boring neutral, but nothing was even close to overbearing. Nothing there to complain about, its sound was great, bass was tight, the amount of detail for its size was unheard of for me.”

"The iQube, though, made my jaw DROP. Paired with my Monica 2, I was absolutely floored by the iQube, especially while playing a lossless copy of the Fellowship of the Ring soundtrack. I may be trying to get a hold of one of these (and a cable upgrade) when finances allow for another upgrade".

See also here.

Changing Battery instruction

Written Instructions click here

Video Instructions click here

The package of the iQube V1 will consist of:

- 1 iQube V1, included rechargeable batteries

- 1 rubber elastic strap

- 1 standard mini to mini

- 1 iQube custom mini USB charging cable

- 1 box

Technical Specifications

Input impedance: 10k ohm

Voltage gain:
low gain: 2
high gain 7

Frequency response @ 200 mV into a 16 Ohm load:
5 - 50 kHz. (-1 dB)

Maximum output power per channel from 20-20,000Hz:
160 mW_16 ohm
80 mW_32 ohm
12 mW_200 ohm

Output impedance:
<0,1 ohm @ f<5kHz
< 1,5 ohm @ 20kHz

THD at 200mV output (typ) 0.01%:
(max) 0.03%.

Output noise:
10uV (unweighted)

Charge input:
any DC voltage between 5V and 20V, polarity protected
battery charge current: 0,3A
typical charger current consumption @ 5Vdc input: 0,4A
typical charger current consumption @ 20Vdc input: 0,1A

Dimensions:
Height: 23 mm
Width: 63 mm
Length: 107mm (incl. volume knob)

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