IS250 integrated amplifier

 

IS250 is a fully balanced high performance stereo integrated amplifier. It contains a stereo solid-state power amplifier, a tube preamplifier and a 32-bit audio DAC. IS250 offers exceptional performance in terms of transparency, dynamic and extraordinary imaging capability at its price range.

The power amplifier employs a new power amplifier topology that comprises independent voltage amplifying stage and current amplifying stage. These two stages are optimized individually before they are put together to form the power amplifier. To improve current amplification, a patented buffer amplifier is used to implement the current amplifying stage. The IS250 delivers 250W to a 4W load per each channel.
 
The tube preamplifier employs all-tube pure Class-A single-stage fully balanced design. 12AU7 and 6922 vacuum tubes are used for signal amplification. No semiconductor device is located in signal path. Additionally, no global feedback is used so that the purity of the musical signals is preserved.

The audio DAC processes USB 2.0 signals up to 32-bit 384kHz sampling rate and takes DSD64 and DSD128 format. For SPDIF inputs, it performs up to 24-bit 192kHz sampling rate.

 

 

PRODUCT DESIGN
A stereo integrated amplifier contains a solid- state power amplifier, a tube preamplifier and a 32-bit audio DAC.

1) POWER AMPLIFIER

    OUTPUT POWER
    125W x 2 for 8W load
    250W x 2 for 4W load

    DISTORTION
    0.02% @ 10W,  8 ohm (1kHz)
    0.1% @ 125W, 8 ohm (1kHz)

    BANDWIDTH
    20Hz to 20kHz

    DAMPING FACTOR
    >150

    SIGNAL TO NOISE RATIO
    > 95dB

2) PREAMPLIFIER

    SIGNAL TUBES
    6922 x 2 per channel

    DISTORTION
    0.05% (@ 2V/100k ohm load)

    SIGNAL TO NOISE RATIO
    > 90dB

    INPUT IMPEDANCE
    94k ohm (balanced input)
    47k ohm (single-ended input)

 

   INPUTS
    Two sets of XLR analog input
    One set of RCA analog input
    One set of USB or SPDIF digital input

    OUTPUTS
    One set of line level output (balanced)
    One set of preamp output (balanced)

3) DAC

    DIGITAL INPUTS
    USB:  Up to 32-bit 384kHz sampling rate,
    DSD64 and DSD128 format

    SPDIF: up to 24-bit 192kHz sampling rate

    DIGITAL OUTPUT
    SPDIF: up to 24-bit 192kHz sampling rate

    DISTORTION
    0.005% (balanced output)

    SIGNAL TO NOISE RATIO
    > 115dB (balanced output)

4) GENERAL

    MAXIMUM POWER CONSUMPTION
    600W

    DIMENSION
    220 x 470 x 475mm (H x W x L)

    NET WEIGHT
    32kg / 70pounds                                                                                             

 

 

"I enjoyed the IS250 tremendously. You would be hard pressed to find a better value at this price point. The IS250 could be the core of a nice sounding small system and its line level outputs would easily accommodate a subwoofer or two. I also find that the JE Audio design aesthetic aligns well with my own. I am a big fan of fully balanced designs and see it as smart to use tubes and solid state, combining the magic of both in a superbly built product. This is another real winner for JE Audio." Will Wright of Positive Feedback Online. (Click here to read the full review.)

 

"Its warm, detailed, relaxing sound exceeded my expectations, and it was completely unfussy to use. JE’s first digital effort must be graded a complete success, and, unsurprisingly, its analog section continues their tradition of great sound. If you have a turntable, you’ll need an external phono preamp -- but you may have one already. The IS250, like the other JE Audio models we’ve auditioned, sounded really splendid. It would be a great addition to many systems." Vade Forrester of SoundStage. (Click here to read the full review.)

 

(German)

“A powerful analog amplifier with a modern DAC. JE Audio’s IS250 has skillfully combined traditional and modern technologies into a real amazing product, which is technically and musically convincing.” Philipp Schneckenburger of Hi Fi, Germany. (Click the icon to read the full review.)