iFi AUDIO Retro Stereo 50 Vacuum Tube Amplifier with LS3.5 Speakers Bundle

iFi AUDIO Retro Stereo 50 Vacuum Tube Amplifier with LS3.5 Speakers Bundle

iFi AUDIO Retro Stereo 50 Vacuum Tube Amplifier with LS3.5 Speakers Bundle

B&H # IFR50FS MFR # 302003
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Expected availability: 7-14 business days

Product Highlights

  • Retro-Inspired Tube Amplifier
  • EL84X and ECF82 Vacuum Tubes
  • 25W per Channel Power Output
  • Burr-Brown DAC Chip
  • Supports PCM, DSD, and DXD Formats
  • Bluetooth with aptX
  • Stereo RCA, Optical/Coaxial, USB Inputs
  • Phono Pre-Amp for MM/MC Turntables
  • 4.5" Paper Cone Woofer
  • 1.1" Horn-Loaded, Neodymium Tweeter
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iFi AUDIO Retro - Stereo 50 overview

  • 1Description

The Retro Stereo 50 Vacuum Tube Amplifier with LS3.5 Speakers Bundle from iFi AUDIO utilizes four EL84X and two ECF82 tubes with an advanced ground-up circuit and is equipped with a Burr-Brown DAC chip to output up to 25W per channel. It supports digital and analog inputs, and outputs sound through the included LS3.5 speakers. Each speaker features a 1.1" horn-loaded tweeter, which uses a neodymium magnet, and a 4.5" paper cone woofer.

  • Retro Stereo 50 Vacuum Tube Amplifier

    The Retro Stereo 50 Vacuum Tube Amplifier from iFi AUDIO utilizes four EL84X and two ECF82 tubes with an advanced ground-up circuit and is equipped with a Burr-Brown DAC chip to output up to 25W per channel. It features connectivity for both analog and digital audio devices, with stereo RCA, optical/coaxial combo, and USB inputs. Smart devices with Bluetooth are also supported, with aptX for high-fidelity wireless streaming from supported devices. NFC makes the pairing process easy. The Stereo 50 also has separate 3.5mm and 6.3mm headphone outputs, each with dedicated gain and sensitivity, to work with a wide range of both over-ear and in-ear headphones.

    Digital and Analog Technologies Combined
    The Stereo 50 features four EL84X and two ECF82 analog tubes with an advanced ground-up circuit. Running primarily in Class A, its 25W per channel output provides both power and realism to your music sources. The tubes can be removed and replaced if you wish to customize the sound.
    Bluetooth aptX
    Bluetooth aptX offers CD-like-quality wireless audio beyond normal Bluetooth.
    USB & SPDIF for Computer Audio
    High-resolution audio is supported via USB, coaxial, and optical inputs. It supports PCM from 16-bit/44 kHz up to 32-bit/768 kHz, DSD up to Octa-DSD512 (22.6/24.6 MHz, and DXD 2x to 768 kHz. The minimum phase filter for PCM and bit-perfect filter for DXD/DSD ensure maximum enjoyment with a smooth and organic tonality.
    Burr-Brown DAC with AMR Technology
    The Burr-Brown DAC chip uses trickle-down technology from AMR to give your digital music a classic, analog sound.
    1/4" and 1/8" Headphone Outputs
    The Stereo 50 uses separate 1/4" and 1/8" headphone outputs, each with its own dedicated gain and sensitivity to match high-sensitivity in-ear monitors and low-sensitivity over-ear headphones respectively. The 1/4" output pumps out 7000mW to power high-impedance headphones. The 3D Holographic for Headphones technology uses pure analog signal processing to deliver a wide-open and spatially correct sound stage for headphones to enhance the listening experience. XBass dynamically corrects the bass response.
    Powerful Phono Pre-Amp
    The MM/MC phono input has an adjustable ultra-wide gain from 38-62 dB and its tone control invokes classic equalization technology. With 6 different EQ curves (via the precision tone control), every stereophonic record is catered for, from the default RIAA to EMI and Decca. The noise floor of the Stereo 50 is below (as opposed to above) that of the record.
    Analog Tone and Volume Controls
    Digital volume controls truncate the delicate audio signal, so the Stereo 50 uses analog tone and volume control. A motorized Alps potentiometer controls the volume with a less than 3 dB tracking error. A remote control is included for use from your couch.
  • Retro LS3.5 Speakers (Pair)

    The Retro LS3.5 Speakers from iFi AUDIO features a 1.1" horn-loaded tweeter, which uses a neodymium magnet, and a 4.5" paper cone woofer. The small neodymium magnet structure shifts cavity resonances outside the audible range. Being horn-loaded, it matches with the wideband driver to create a vast sound field. The tweeter is used only at the very top end of the audible range; the whole range from 59 Hz to 8 kHz covering the fundamentals of all instruments except those with very low bass notes and all the formants is covered by the wideband driver, without any electrical or mechanical crossover.

    The speaker's arrangement of the crossover for the tweeter (at approximately 10 kHz acoustic crossover) and the tweeter's waveguide, insets it for time-alignment with the wideband driver that further preserves phase/impulse response. The paper cone 4.5" wideband driver perform more like a full-range driver. The wideband driver rolls off after 8 kHz and it reaches down to 59 Hz (with correct placement).

    Wideband driver is made of the coated natural paper for quick response and better efficiency
    Tweeter is made of transparent organic silk and horn-loaded to create a coherent image with the wideband driver
    Cabinet is made from natural sustainable bamboo
    Cabinet is an advanced multi-chamber P.G.A.H Voigt tuned enclosure with a low turbulence port to reduce port noise at high levels
    Each cabinet is tuned using tuning elements (sound bar and braces) from musical instrument manufacturing
    Time-aligned tweeter and wideband driver
    Advanced amino-plastic open cell acoustic foam for bass performance and a clean midrange
    Maximum surface contact gold-plated copper speaker terminals
In the Box
Bundle Items
  • Remote Control
  • Rubber Feet
  • Optical Adapter
  • 3.5mm Audio Cable
  • Bluetooth Antenna
  • USB Cable
  • RCA Cable
  • Power Cable
  • Speaker Cables
  • Non-Slip Mat
  • White Gloves
  • Limited 1-Year Warranty
  • Limited 1-Year Warranty
Table of Contents
  • 1Description
  • Retro Stereo 50 Vacuum Tube Amplifier
    Wireless Bluetooth aptX
    Digital Input 1 x USB Type-B (DSD512 / 768 kHz / 2 x DXD)
    1 x coaxial/optical combo (192 kHz)
    Analog Input 2 x phono (MM/MC low/MC high/line 3)
    2 x stereo RCA
    1 x 3.5 mm (front; shared with line 2)
    Outputs 2 x speaker pairs, 4-16 Ohms
    1 x 1/8" (3.5 mm) headphone (output impedance <3 Ohms)
    1 x 1/4" (6.3 mm) headphone (output impedance <6 Ohms)
    Power Output >25 W (majority Class A)
    Total Harmonic Distortion (THD) <0.2% (at 2.83 V / 1 W)
    Output Bandwidth 10 Hz to 60 kHz
    Frequency Response 10 Hz to 80 kHz
    Signal-to-Noise Ratio Amplifier: 101 dB (at max output)
    Phono MM: 90 dB(A)
    Phono MC: 80 dB(A)
    DAC Dynamic Range >113 dB(A)
    Tone Control Bass (100 Hz): 8 dB
    Treble (10 kHz): 8 dB
    Gain Phono: 38, 50, 62 dB
    Tubes 2 x ECF82
    4 x EL84X
    Files Supported PCM: 768/705.6/384/352.8/192/176.4/96/88.2/48/44.1 kHz
    DSD 512/256/128/64: 24.6/22.6/12.4/11.2/6.2/5.6/3.1/2.8 MHz
    DXD: 768/705.6/384/352.8 kHz
    Filters: Minimum Phase (PCM 192/176.4/96/88.2/48/44.1 kHz), Bit Perfect (DXD/PCM 768/705.6/384/352.8), Analog (DSD)
    Power Supply 100 to 240 VAC
    Power Consumption On: 75 W
    Standby: 0.1 W
    Dimensions 11.8 x 6 x 8.9" (300 x 153 x 226 mm)
    Weight 12.8 lb (5.8 kg)
  • Retro LS3.5 Speakers (Pair)
    Sensitivity 90 dB / 2.83 V / 3.3' (1 m)
    Frequency Response 59 Hz to 20 kHz
    Drivers 4.5" (115 mm) Paper Cone Wideband Driver
    1.1" (28 mm) Silk Dome Tweeter
    Impedance 4 Ohms
    Crossover 10 kHz acoustic crossover
    No electrical crossover on wideband driver
    First order high-pass on tweeter
    Enclosure Transmission-line port
    Solid bamboo enclosure
    Acoustic active tuning with minimal damping
    Dimensions 5.7 x 10.5 x 8.9" (146 x 268 x 226 mm)
    Weight 7.7 lb (3.5 kg)

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