The AMP 911 is a portable headphone amplifier, 100% developed and manufactured by EarSonics. It meets the criteria of best market sound quality with a very broad bandwidth and ultra fast rise time for better transient response. The AMP 911 is manufactured with no compromise on ingredients that are perfectly matched and very upscale.

It's All In The Details                                                                                                  

FiiO has strived to constantly progress and innovate with fresh ideas in the portable amplifier market since its own entry. With the A5, we continue this tradition by striving to significantly improve over our previous products, the E12 series. Every last detail of the E12 series has been reworked and revamped so as to create a new headphone amplifier that not only maintains the E12 series' strenghts, but also rises above them for an even better product. 

Strong Internals Make For A Lively Listen

The A5 continues to use the E12A's highly effective MUSES02 + LME49600 opamp combo. In addition, all major components utilize high-precision metal film resistors. These factors, along with better design and component selection, allow the A5 to achieve a total harmonic distortion (THD) rating of almost 0 percent (lower than the E12A's by 33%) and an improved signal-to-noise ratio of 115dB. All of these factors signify that the A5 has a gain level close to that of the E12, but has improved channel balance, lower noise floor, and overall a purer sound.

Clean and potent power is also extremely important to sound quality. The A5 contains a highly efficient, low-resistance power management system as well as dual +/-11V supplied power. This is a significant increase over the E12A's +/-7.4V supplied power and gives the A5 considerable power reserve that is unheard of among portable amplifiers. Finally, a +/- symmetrical power supply allows for the elimination of coupling capacitors. What does this all mean for the sound quality? Reduced distortion and increased dynamic range.

All of this aspects mean that the A5 combines the best of both the E12 and the E12A. Beyond just getting output power near that of the E12 with 800mW at 32 Ohm, you also get the E12A's exquisite abilities in reproducing music. And with the low/high gain switch you can enjoy the A5 on all kinds of headphones, from the most sensitive IEMs to the most power-hungry headphones. 

Longer Battery Life Backed By Smart Charging

Contained in the A5 is an 880mAh 3S (three cells in series) battery. The A5 can automatically adjust the amount of current to the 3S battery when charging by detecting your particular charging equipment. Whether you charge from your computer's USB port, your cell phone charger, or even your tablet's charger, you can be assured that the A5 will choose the safe and appropriate charging speed. With a 5V/2A charger, the A5's battery can befully topped up in 2.5 hours -- faster and more convenient compared to other similar products. And despite the A5's high power output, the amp still lasts for a lengthy 12 hours. 

Charging That Is Obvious At A Glance

The A5 has an LED specifically designed to let you know device's charging status immediately. Depending on the amount of current when charging, the LED will blink at an appropriate rate which allows you to quicklydetermine the present charging speed. There is also a working status indicator that lets you immediately know whether the unit is on or off. 

All New CNC Milled Headphone Connectors

For the sake of creating an ever better product, no detail could be overlooked. The headphone connector was no exception. For the first time, we use a CNC stainless steel headphone connector ring, replacing the previously used copper. A plastic ring is pressed into the gap between this connector ring and the rest of the body, ensuring it is seamless integrated with zero gaps. Not only is this more aesthetically pleasing, the headphone connector is also sturdier due to the non existent gaps and the use of harder stainless steel.

Geometrical Beauty From A Functional 45°

We decided to break away from our design traditions when creating the A5. Take, for instance, the design of the volume knob. Inspired by string instruments, fifty-six 45° lines are etched onto the knob's surface. The laser-inspired red ring that adorns the knob gives it a distinct, characteristic look.

Fine Grains Of Zirconium For A Smooth Finish 

Instead of the brushed metal finish of our earlier amps, we elected to go with a sandblasted finish for the A5. In the sandblasting process, abrasive material is forcefully sprayed into the body's surface with highly compressed air. This ensures that the surface is not only more durable, but also allows the anodized paint that gives the A5 its unique look to last longer. By having the aluminium body subjected to this process, the A5 is both more robust and striking in appearance.

Specifications

Output power: >800mW (32 Ohm THD <1%)

S/N ratio: >= 115dB

THD+N: <0.002% (1kHz)

Play time on a single charge: 13h

Recommended headphone impedance: 16-300 Ohm

Dimensions: 124mm x 65.5mm x 14.5mm

Weight: 168g

The FiiO E1 Portable Headphone Amplifier for iPod / iPhone specifically designed for use with Apple’s iPod and iPhone. It is the first headphone amplifier in the world with in-line remote control functions. The FiiO E1 has a built in high quality headphone amplifier IC manufactured by Texas Instruments. The FiiO E1 uses the line out signal from the iPod / iPhone, so it provides better sound quality, and is able to drive high impedance or low sensitivity headphones! With the in-line control function, you can easily control the playback of the iPod / iPhone from the E1 Amplifier! The FiiO E1 will bring you better sound quality and a more convenient playback experience! Output power: 100 mW (16 ohms Loaded), 12 mW (300 ohms Loaded) * Signal to Noise Ratio: â?¥98 dB * Distortion: < 0.009% (10 mW) * Frequency Response: 10 Hz - 80 KHz * Suitable Headphone Impedance: 16 ohms - 300 ohms * Power Supply: iPod/iPhone power 3.3V * Length: 800mm (Line Exposed) * Weight: 20g

• Designed for high impedance and low sensitivity headphones
• Small, compact, and sleek, with removable clip for convenient and easy use
• New amplifier circuit, low noise and distortion with enhanced dynamics
• Built-in EQ with two level bass boost and electronics volume control