User manual
iFi AUDIO Retro Stereo 50 Vacuum

User Manual for iFi AUDIO Retro Stereo 50 Vacuum Tube Amplifier

• 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

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.

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Technical parameters

iFi AUDIO Retro - Stereo 50 Specs

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 60% users recommend this product to others. And what about you? This product has already been rated by 19 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