SPL Phonos (Red)

Phonos is a preamplifier for record players using either moving magnet (MM) or moving coil (MC) cartridges

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SKU: 48243 Categories: , ,
SKU: 48243
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SKU: 48243

SPL Phonos (Red)

Phonos is a preamplifier for record players using either moving magnet (MM) or moving coil (MC) cartridges

Phonos is a preamplifier for record players using either moving magnet (MM) or moving coil (MC) cartridges. The equalization curve is according to RIAA and suitable for all vinyl records since 1954. 

This phono preamplifier is equipped with the best sounding capacitors and built after the legendary Douglas Self design.

The control parameters are adjustable on the front and therefore always accessable to make the search for the best sounding setting a fun experience.

MM and MC

There are two primary methods a modern cartridge uses to generate current. These are moving magnet (MM) and moving coil (MC) configurations.

Moving Magnet

Moving magnet cartridges tend to produce lush, mellow sound. By moving a magnet within copper coils a small voltage is created. MM cartridges sport very high inductance and impedance. In the latter, cable capacitance can negatively affect the flatness of frequency response and linearity of phase response. Phonos offers a selection of four capacities to fine tune the flatness of the frequency response or to willingly increase high frequencies in playback. The capacities are 150pF, 220pF and 330pF. In the OFF position the capacitance is determined by the cable capacitance.

Moving Coil

The MC design is again a tiny electromagnetic generator, but (unlike an MM design) with the magnet and coils reversed. The resulting signal is only a few hundred microvolts, and thus more easily swamped by noise, induced hum, etc. Thus it is more challenging to design a preamplifier with the extremely low noise inputs needed for moving-coil cartridge. Phonos provides a 20dB higher preampfification for the MC stage compared to the MM stage.

MC cartridges offer very low inductance and impedance, which means that the effects of capacitance (in the cable that goes from the cartridge to the preamp) are negligible. The impedance of cartridge can be set in six values: 100, 220, 470, 2.2k, 4.7k, and 10kOhm. If in doubt which impedance matches the cartridge’s impedance you can empirically determine the value for the flattest frequency response.

Subsonic filter

Rumble from the playback turntable’s drive mechanism is amplified by the low frequency boost that occurs on playback. The Phonos offers a switchable Subsonic filter to eliminate the rumble.

RIAA equalization

RIAA equalization is a specification for the recording and playback of phonograph records, established by the Recording Industry Association of America (RIAA). The RIAA equalization curve was intended to operate as a de facto global industry standard for records since 1954.

The purposes of the RIAA equalization, which is a form of pre-emphasis on recording and de-emphasis on playback, are to permit greater recording times by decreasing the mean width of each groove, to improve sound quality, and to reduce the groove damage that would otherwise arise during playback.

A recording is made with the low frequencies reduced and the high frequencies boosted, and on playback the opposite occurs. The net result is a flat frequency response, but with attenuation of high frequency noise such as hiss and clicks that arise from the recording medium.

Gain

The preamplification is switchable and offers three values for MM and MC.

The Normal gain is +46 dB (MM) and +67 (MC).

In the -10dB position the Phonos produces enough output level for standard consumer electronics products operating on -10dBV.

In the +4dB position the output is equally loud as modern DA converters at 0dBfs = +15dBu.


Specifications

Inputs and Outputs

  • RCA, unbalanced, gold-plated
  • Input impedance (MM): 47 kohms
  • Input impedance (MC): switchable
  • Output impedance: < 5 ohms
  • Crosstalk: -80dB (at 1 kHz)

Filter

  • RIAA equalizer (after Douglas Self)

Moving Magnet (MM) preamplifier

  • Amplification: 46 dB (Norm.), 36 dB (-10 dB), 50 dB (+4 dB)
  • Switchable capacitance: Off, 150 pF, 220 pF and 330 pF
  • Noise (A-weighted): -85,3 dB

Moving Coil (MC) preamplifier

  • Amplification : 67 dB (Norm.), 56 dB (-10 dB), 71.5 dB (+4 dB)
  • Schaltbare Impedances: 100, 220, 470, 2k2, 4k7, 10 k ohms
  • Noise (A-weighted): -61,7 dB

Internal Operating Voltage

  • +/- 60 V

Power Supply

  • Mains voltage (switchable): 230 V AC / 50 Hz or 115 V AC / 60 Hz
  • Fuses: 230 V: T 500 mA; 115 V: T 1 A
  • Power consumption: max. 30 VA
  • Stand-by power consumption: 0.7 W

Dimensions (incl. feet)

  • 278 mm W x 57 mm H x 330 mm D
  • 10.95 in W x 2.24 in H x 13 in D

Weight

  • 3.2 kg; 7.05 lbs (unit only)
  • 4.3 kg; 9.5 lbs (shipping)

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Return and restocking option is available for private customers only. We will issue a refund/credit if you are not satisfied with your purchase and notify us within 10 days of product receipt. It must be returned in the original packaging and in saleable condition and must be returned freight prepaid. Return and restocking rights are not applicable for Audio/Video and software products. Shipping and handling charges to and from are not refundable.

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