PROFESSIONAL FIDELITY

Phonos

RIAA Phono Preamplifier

This phono preamplifier for Moving Magnet (MM) and Moving Coil (MC) pickup systems is based on the legendary Douglas-Self-Design.

MM & MC

There are two pickup systems for record players: Moving Magnet (MM) and Moving Coil (MC).

Moving Magnet

Moving magnet pickups generate a small voltage by moving a magnet between copper coils. MM pickups have a very high inductance and impedance.

The Phonos offers a choice of three capacitors to correct the linearity of the frequency and phase response. The capacitances are 150pF, 220pF and 330pF. In the off-position the capacitance is determined by the capacitance of the cable.

Moving Coil

The MC pickup is also a small electromagnetic generator, but with the magnets firmly anchored and the coils moving between them, i.e. exactly the opposite of the MM pickup.

The output voltage, however, is very low at only a few hundred microvolts and is therefore more sensitive to noise and induced hum. This makes preamplifier design a challenge, because the very low output voltage must be pre-amplified extremely noise-free. Phonos offers one of the most powerful phono preamplifiers for MC systems with up to 71.5 dB preamplification. Thanks to the 120V technology, the preamplifiers are extremely low-noise, linear and phase-locked.

MC pickups have a very low inductance and impedance. This means that the effects of cable capacitance (from turntable to preamplifier) are negligible. The impedance, however, is relevant and can be set in six positions: 100, 220, 470, 2.2 k, 4.7 k, and 10 kOhm. If there is any doubt as to which impedance matches that of the pickup, the impedances can also simply be switched through until the linear frequency response is acoustically determined.

"The SPL Phonos is a phono stage with exceptional character. With so much sonic quality, the price is well below its musical equivalent."

Wolfgang Kemper
HIFI STATEMENT

Amplification

The pre-amplification can be switched in three values. The normal gain value is +46 dB for MM and +67 dB for MC cartridges.

In the -10 dB position, the phono produces enough output level for normal hi-fi equipment operating at a reference level of -10 dBV.

In the +4 dB position, the output level is about as loud as that of modern DA converters at a reference level of 0dBfs = +15 dBu.

Subsonic Filter

The rumbling of the turntable’s drive mechanism is also amplified by the high amplification of the bass range due to RIAA equalization in playback. The Phonos offers a switchable subsonic filter to remove this rumble. 

"The SPL Phonos is a phono amplifier just the way you want it to be: Completely uncomplicated in operation, robust and intelligently built. With just a few clicks it is tuned to the respective pickup system and then it's ready to go - and how!".

Alexander Aschenbrunner
HIFI STARS

Connections

Gold-plated RCA sockets are available for connecting the turntable and for outputting to a preamplifier such as the Director Mk2 or the Elector. 

A ground connection for the turntable is designed as banana plug socket. The ground lead can be either clamped or plugged in.

"The "SPL Phonos... scores... with fine drawing, natural, full sound colours and crisp, confident dynamics - or as LowBeats TV presenter René Heller put it: it 'rocks'.

Holger Biermann
LowBeats

RIAA Equalization

RIAA equalization is a specification for the recording and playback of records proposed by the Recording Industry Association of America (RIAA). The RIAA equalization curves introduced a global de facto industry standard for vinyl records in 1954.

RIAA equalization uses pre-emphasis to reduce low frequencies and boost high frequencies when the record is cut (blue RIAA curve).

The bass is reduced by up to 20 dB to provide more space and longer record play time.

The high frequencies are boosted by up to 25 dB to increase the signal-to-noise ratio between the noise and the hot of the record media to the audio signal.

During playback, exactly the opposite happens in the phono. The de-emphasis filter (red RIAA curve) compensates for the pre-emphasis and the result is a linear frequency response.

Douglas Self Design

The RIAA equalization of the phono was developed according to the recommendations of Douglas Self.

Idea: Many small capacities instead of a few large capacities.

Advantages: The capacitors charge and discharge faster, which results in better resolution and faster impulse response.

Only audiophile Styroflex capacitors are used in the entire RIAA equalizer.

About the person: Douglas Self is a British electronics engineer with a strong penchant for audio. He holds honorary degrees from Cambridge University and teaches psychoacoustics at the University of Sussex.

"The SPL Phonos is an exceptionally good sounding phono preamplifier that has a considerable potential for addiction. Its joy of playing, its enormous dynamics and the accuracy with which it brings out the finest sound structures are always inspiring. The price-performance ratio is excellent".

Freda Ressel
Professional Audio

The VOLTAiR Technology

What exactly is that?

And what does it do?

Good questions need good answers. And that’s what the 120V video gives you.

Play Video

VOLTAiR is that good

In the lab, we pitted Phonitor xe against the best audio measurement system and found that Audio Precision could not measure VOLTAiR technology.
Play Video
Play Video
This video guides you step by step through the Phonos.
Play Video
And in this video we introduce you to the entire Professional Fidelity Series.​

Reviews

Professional Audio
Hifistatement
LowBeats

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Play Video
Replacement of defective fuses for 115V
Play Video
Replacement of defective fuses for 230V
Play Video
Changing the mains voltage from 115V to 230V
Play Video
Changing the mains voltage from 230V to 115V

Specifications

Analog Input & Output: RCA

Input impedance (MM)
47
Input impedance (MC)
switchable
Output impedance
75 Ω
Frequency range (-3 dB)
4 Hz – 300 kHz
Crosstalk (1 kHz)
-80 dBu

Moving Magnet (MM) Preamplifier

Amplification (Norm)
46 dB
Amplification (-10 dB)
36 dB
Amplification (+4 dB)
50 dB
Capacitance (switchable)
Off, 150 pF, 220 pF and 330 pF
Noise (A-weighted; 46 dB amplification)
-85.3 dBu
Dynamic range
131.3 dB

Moving Coil (MC) Preamplifier

Amplification (Norm)
67 dB
Amplification (-10 dB)
56 dB
Amplification (+4 dB)
71.5 dB
Impedance (switchable)
100 Ω, 220 Ω, 470 Ω, 2.2 kΩ, 4.7 kΩ, 10
Noise (A-weighted, 67 dB amplification)
-61.7 dBu
Dynamic range
128.7 dB

Internal Linear Power Supply with Shielded Toroidal Transformer

Operating voltage for analog audio
+/- 60 V
Operating voltage for relays and LEDs
+ 12 V

Mains Power Supply

Mains voltage (selectable, see fuse chamber)
230 V AC / 50; 115 V AC / 60 Hz
Fuse for 230 V
T 500 mA
Fuse for 115 V
T 1 A
Power consumption
max. 30 VA
Stand-by power consumption
< 0,3 W

Dimensions & Weight

W x H x D (width x height incl. feet x depth)
278 x 100 x 330 mm
11 x 4 x 13 inch
Unit weight
3.2 kg
7.05 lb
Shipping weight (incl. packaging)
4.3 kg
9.48 lb

Reference: 0 dBu = 0,775V. All specifications are subject to change without notice.

Slimmer is smarter

Events

Due to Covid19 there are no events scheduled at this time.

What does it actually mean …

In Stock!

The product is in stock in our warehouse in Niederkrüchten, Germany, and will be shipped the same or next working day.

We process the orders after receipt of the order and update the stock in the online shop regularly. If the product is no longer available at short notice due to high order volume, you naturally have the right to withdraw from the purchase (see Right of Withdrawal).

In any case, you will receive an e-mail with details of the delivery and the estimated delivery time.

Available soon!

The product is not in stock in our warehouse in Niederkrüchten, Germany. Usually it will be available again within 5 working days.

In any case, you will receive an e-mail with the details of the delivery and the estimated delivery time.

Of course you have the right to withdraw from your purchase (see Right of Withdrawal).

Product Condition

A-Stock

Brand-new product from the current product portfolio.

B-Stock

Demo, exhibit or return item.
In original packaging, incl. manuals and full warranty.
Only slight to no signs of use.

C-Stock

Demo, exhibit or return item.
In original packaging, incl. manuals and legal warranty.
In some cases clear signs of use, which are documented in photos.

NOS

"New Old Stock"
After discontinuation of a product still available new products with full warranty.

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