iQube V2

Lightweight, portable Headphone amplifier
High efficiency (90-95%) Class D amplifier

Built in USB receiver and separate DAC
Tentlabs ultra low jitter clock generator
Runs on 4x AAA rechargeable batteries, non-user replaceable
8-fold output buffer for a (near to) load independent output behaviour
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)
* Optimised board design enhances signal quality
* Alps potentiometer
* Visay series 036 decoupling capacitors throughout
* Panasonic stack film capacitors
* Carbon signal resistors
* Lumberg I/O connectors

Fully RoHS compliant
Retro art design, CNC machined aluminium casing
Rubber touch feel painted covers


Technical Specifications

Analogue Input impedance:
10k ohm

Digital mini USB Input :
Digital Resolution (USB) 16 bit
Sampling frequencies (USB) 32 / 44.1 / 48 kHz

DAC type CS4344, 24 bit delta sigma, 105dB dynamic range

On board Sample rate converter

Ultra low jitter Tentlabs clock (12.000 MHz) synchronously driving USB receiver, sample rate converter, DAC and class D circuitry

Voltage gain:
low gain: 2
high gain 7

Frequency response @ 200 mV into a 16 Ohm load:
Analogue input 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%:
Analogue input (max) 0.03%.

Output noise:
10uV (unweighted)

Charge input: (mini USB input)
USB mini input, DC voltage 5V +/- 5%, polarity protected
typical charger current consumption @ 5Vdc input: 0,4A
battery charge current: 0,3A

Dimensions:
Height (thick): 23 mm
Width: 70 mm
Lenght: 126 mm (incl volume knob)

Weight:
Without batteries: 155gr
With batteries: 200gr
Packed: 400gr