Phaedrus Audio PHILTER User Manual Download | Manualshive

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Ver. 2.0 - ©Phædrus Audio Ltd. 2015 All rights reserved.

User Manual for

PHILTER – Vintage passive EQ

This manual is also available as a pdf download, Go to:

www.phaedrus-audio.com

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Summary of Contents for PHILTER

Page 1: ...Ver 2 0 Phædrus Audio Ltd 2015 All rights reserved User Manual for PHILTER Vintage passive EQ This manual is also available as a pdf download Go to www phaedrus audio com ...

Page 2: ...is to reproduce the quality and character of classic equipment but in a modern highly reliable and cost effective way Chapter 1 Background The Phædrus Audio products came about because two recording musicians wanted to own a classic console from the nineteen sixties Ideally a famous EMI REDD all valve vacuum tube mixer used to record The Beatles But those desks make a collection of hen s teeth loo...

Page 3: ...er designed from the common source of Mullard s reference audio designs and thereby sharing a common heritage with the REDD amplifiers was developed We called this amplifier the Phaedrus PHILHARMONIC literally music loving This PHILHARMONIC amplifier forms the heart of the Phædrus Audio LONDON Mark II console The PHILHARMONIC amplifier circuit is described in detail below in section Circuit descri...

Page 4: ...ips Although Phædrus Audio equipment uses printed circuit boards to ensure consistent performance and reliability the equipment follows classic practices such as star earths and natural contour tracking just like hook up wire Every Phædrus Audio product is hand assembled and individually tested A test pro forma is provided with every unit Phædrus Audio offer comprehensive service for products both...

Page 5: ... longer minimum warranty period is mandated by applicable local laws If equipment fails due to such defects within this period Phædrus Audio will at its option repair or provide a replacement for the defective part or product Valves vacuum tubes are excluded from the one year warranty but are warranted for 90 days from day of purchase This warranty does not extend to any Phædrus Audio Ltd product ...

Page 6: ...red by Phædrus Audio Ltd be sure carefully to read the applicable items of these operating instructions and the safety suggestions Keep them for future reference Follow the warnings indicated on the unit as well as in the operating instructions Selection of PSU Suitable PSUs for the Phædrus Audio Ltd products are available as line items from Phædrus Audio They are PHAE PSU 110 110V mains plugtop P...

Page 7: ...equipment near any source of water or in excessively moist environments Keep your Phædrus Audio equipment away from babies children and pets Do not let objects do not fall or liquids be spilled into the enclosure Situate the Phædrus Audio equipment away from heat sources or other equipment that produce heat Ensure Phædrus Audio equipment has adequate ventilation Improper ventilation will cause ove...

Page 8: ...the line amplifier makes up for the loss in the passive Q circuits when the controls are central and no boost is applied In a passive equaliser boost is actually provided by reversing the loss of the equaliser over a range of frequencies In other words when boost is applied bass frequencies are un cut This means that when large degrees of boost are applied it may be necessary to reduce the signal ...

Page 9: ...o boost in 2dB steps anti clockwise to cut in 2dB steps The central control may be used to modify the character of the treble frequency boost Depending on the frequency setting 2 5kHz 3 5kHz 5kHz 8kHz 10kHz 12kHz when the treble control is rotated clockwise beyond the central position boost is applied with a broad peak in the response at the indicated frequency Note that this control is NOT active...

Page 10: ...standard VU instrument the input attenuator should be set so that the output level reads around 4VU with occasional peaks to 0VU on programme On a digital meter this is equivalent to signal peaks reading 6dB above recording industry standard 4dBu alignment level This is equivalent to 10dBu or 8dBFS on equipment aligned to EBU R64 1992 standard and 14dBFS on equipment aligned to SMPTE RP155 as illu...

Page 11: ...g this vintage circuitry to explore its character in gradual overload For example peaks may be allowed to reach 18dB above alignment level without clipping The Phædrus Audio PHAB and the PHAME preamplifiers and the PHILTER equaliser may thus be used directly to feed modern A to D conversion equipment aligned to EBU or SMPTE standards following the recommendations illustrated right Equaliser perfor...

Page 12: ...Ver 2 0 Phædrus Audio Ltd 2015 All rights reserved Mid position response 1dB variation ...

Page 13: ... Pin 2 Signal Pin 3 Connect to Pin 1 Pin 3 Signal PHILTER Specification Circuit configuration Vintage style inductor capacitor passive EQ Output Balanced Maximum output level 18dBu 1kHz Input Balanced Maximum input level 18dBu 1kHz Gain Nominally 0dB maximum boost is 10dB Frequency response 40Hz to 15kHz 1dB 15Hz to 30kHz 3dB control flat Distortion 1 40Hz 4VU 0dBu gain 40dB Noise 120dB referred t...

Page 14: ...Box The basis on which conformity is being declared The manufacturer hereby declares that the products identified above comply with the protection requirements of the EMC directive and with the principal elements of the safety objectives of the Low Voltage Equipment directive and that the following standards have been applied IEC INTERNATIONAL STANDARD 60065 Audio video and similar electronic appa...

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