User manual
iFi AUDIO Retro Stereo 50 Vacuum

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

• Product category: Amplifiers iFi AUDIO
• Brand: iFi AUDIO
• Description and content of package
• Technical information and basic settings
• Frequently asked questions – FAQ
• Troubleshooting (does not switch on, does not respond, error message, what do I do if...)
• Authorized service for iFi AUDIO Amplifiers

Product description

• 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

• 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

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Technical parameters

• 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): Rating 50% users recommend this product to others. And what about you? This product has already been rated by 20 owners. Add your rating and experience with the product. Discussion Ask our technicians if you have a problem with your settings, or if anything is unclear in the user manual you have downloaded. You can make use of our moderated discussion. The discussion is public and helps other users of our website who may be encountering similar problems. The discussion is empty - enter the first post Post a new topic / query / comment: Items marked with * are required. Your name *: E-mail : Subject *: Message *: Your email address will not be displayed. Do not forget to fill it in if you want to receive a reply to your enquiry/contribution. Processing of personal data in accordance with GDPR