Mark Levinson N28 Car Amplifier User Manual
Contents
1. this Mark Levinson product s warranty is owner transferable Warranty conditions are valid only in the country where the product was originally purchased For warranty information and conditions on products purchased outside of North America contact your local dealer or regional distributor 11 Dimensions N 28 top view Dimensions N 28 side view 12 Dimensions 3 8 9 5 1 3 2 A 1 D 25 4 jj 2 3 4 dia QO 19 1 17 17 64 438 6 15 17 64 17 1 2 387 8 444 5 1 1 2 74 7 1 0 gt 38 1 190 5 Y y v 10 7 8 E 276 3 4 2 9 16 2 3 4 65 1 69 9 7 16 7 64 11 1 2 5 Dimensions PLS 228 top view Dimensions PLS 228 side view 3 16 4 8 3 8 9 5 A a 1 4 A E 3 4 dia b 8 3 16 2 208 0 5 3 4 8 35 64 146 1 217 1 1 55 64 9 1 16 gt 47 2 230 2 y Y 5 13 1 8 333 4 A 4 2 39 64 2 3 4 66 3 69 9 7 16 5 64 11 1 2 0 13 MADRIGAL MADRIGAL AUDIO LABORATORIES 2081 South Main Street P O Box 781 Middletown Connecticut 06457 USA Telephone 203 346 0896 Fax 203 346 1540 ec evinSon is a registered trademark of Madrigal Audio Laboratories Inc 630080 2 1993 Madrigal Audio Laboratories2. 2 Signal non inverting ED Pin 3 Signal inverting fy Connector ground lug chassis ground Refer to the operating manual of your balanced output line level source to verify that the pin assignments of its output connector correspond to the N 28 If not wire the cable so that the appropriate output pin connects to the equivalent input pin Note If you won t be using the N 28 s balanced inputs and need more single ended inputs it s possible to fabricate a cable to connect line level sources with single ended output to these balanced inputs Male 26 connect to Male XLR zu 3 S 4 one to 22 guage E buss wire TAPE 1 TAPE 2 OUTPUTS Connect these outputs to the right channel and left channel tape inputs of your tape machine These outputs are unaffected by the OUTPUT LEVEL control on the front panel of the N 28 MAIN Connect these outputs to the right channel and left channel inputs of your power amplifier or electronic crossover These outputs are affected by the OUTPUT LEVEL control on the front panel of the N 28 BALANCED MAIN If your power amplifier is equipped with balanced input connectors it s best to connect it to the N 28 via these connectors particularly if long cable lengths are required Connect the right channel and left channel BALANCED MAIN outputs of the N 28 to the appropriate balanced inputs of the power amplifier The pin assignments of these XLR type male outputs are Pin 1 S
3. On Off Off Off 3 Off Off On Off Off 4 Off Off Off Off On Resistance values other than those listed above can be accommodated via the optional load terminals Load resistors can be inserted into these terminals allowing virtually any load desired Optional load t componen fo TN fS 7 i PC board See Making the internal adjustments refer to the Cartridge loading settings tables for the proper switch positions for the optional load Because the inherent input resistance all switches off is in parallel with the optional load terminals use this formula to calculate the actual resistor needed R 1 1 RD X RD Desired Resistance in ohms X 0 00002 for Low gain Phono Option 0 0001 for High gain Phono Option Note We recommend precision metal film resistors see your Mark Levinson dealer Internal adjustments varying the input capacitance Making the internal adjustments N 28 internal adjustments If you wish to vary the input capacitance of the phono option to obtain the optimal value for a particular cartridge a capacitor may also be inserted into the optional load terminals see Terminating the optional load and Making the internal adjustments Because the inherent input capacitance all switches off is in parallel with the optional load terminals use the following formula to calculate the actual capacitor needed C C C C C The capacitor value C
4. PHONO y axi Q x E O O C man CL aux 3 T TUNER 0 TL o LL n 2 Rear panel PRECAUTION Disconnect all associated equipment from the AC mains BEFORE making any signal connections and applying power to the N 28 Note All left channel RCA type inputs and outputs are at the top of the rear panel and all right channel RCA type inputs and outputs are at the bottom of the rear panel 1 PHONO AUX 1 If your N 28 is equipped with the phono option connect your turntable s right channel and left channel signal leads to these inputs Connect the tonearm ground lead to the GND binding post next to the inputs If your N 28 isn t equipped with a phono option these inputs will accept signal leads from any line level source equipment 2 TUNER Accepts right channel and left channel signal leads from a tuner or other line level source equipment 3 AUX3 Accepts right channel and left channel signal leads from line level source equipment 4 TAPE 1 TAPE 2 INPUTS Accept right channel and left channel signal leads from the tape output connectors of a tape machine These inputs can also be used with other line level source equipment 5 AUX 2 CD Accept right channel and left channel balanced signal leads from a CD player or other source equipment with balanced output The pin assignments of these XLR type female input connectors are op Pin 1 Signal ground Pin
5. be subject to qualitative as well as quantitative interpretation Measurements of the N 28 yield excellent results by any standards However only those specifications that apply to its actual operation are included here E Power consumption SOW maximum depending on options B Mains voltage 100V 120V 200V 220V or 240VAC 50 60Hz E Overall dimensions See Dimensions B Shipping weight 2 boxes 29 lbs 13 2kg B Connector complement 16 female RCA type connectors 4 XLR type female connectors 2 XLR type male connectors 1 binding post for turntable ground ten pin connector IEC mains connector Phono section Bl Gain Selectable see Set up and installation B Moving magnet phono option 38dB 44dB B Moving coil phono option 58dB 64dB B input impedance Selectable see Set up and installation B Output impedance 100 B Maximum output TAPE output 6V E Recommended load TAPE outputs 10KQ or greater Line section B Gain Selectable see Set up and installation B Single ended 6dB 12dB 18dB B Balanced 12dB 18dB 24dB B input impedance 15KQ shunted by 220pf B Maximum output MAIN outputs 6V E Recommended load TAPE outputs 600Q or greater For more information see your Mark Levinson dealer or contact Madrigal Audio Laboratories Inc 2081 South Main Street Route 17 P O Box 781 Middletown Connecticut 06457 USA Telephone 203 346 0896 FAX 203 346 1540 If purchased in North America
6. Inc All rights reserved Printed in U S A
7. NPUT OUTPU LEVEL AUX AUX2 1 ALK TAPEZ TAPE TAPE 2 DEFEAT MONITOR PREAMPLIFIER INPUT SILECTOR MONITOR BELECTOR RECORD ELECTOR Front panel 1 INPUT SELECTOR Selects one of the seven inputs CD TUNER PHONO AUX 1 AUX 2 AUX 3 TAPE 1 or TAPE 2 RECORD SELECTOR Selects between the program source selected via the INPUT SELECTOR and either of two tape monitor inputs selected via the MONITOR SELECTOR In the DEFEAT position the tape outputs are disconnected In the INPUT position the tape outputs are connected while still monitoring the selected source In the MONITOR position the selected tape machine can be monitored without affecting the signal at the tape outputs Note Because of the switching arrangement employed in the N 28 we recommend that while making a critical recording you don t operate the RECORD SELECTOR switch If you wish to monitor the signal from tape set the RECORD SELECTOR to MONITOR and use your tape machine s monitor switch to switch between input and tape MONITOR SELECTOR When the RECORD SELECTOR is in the MONITOR position this selects between the TAPE 1 and TAPE 2 inputs OUTPUT LEVEL Adjusts volume at the main outputs The OUTPUT LEVEL control doesn t affect the tape outputs OUTPUTS MM INPUTS BALANCED MAIN i AUX 2 RIGHT LEFT mS x gm SUPPLY RIGHT LEFT RIGHT LEFT NOU Pec o x o LEFT J GND RIGHT i gt
8. Operating Manual Mark Levinson N 28 Preamplifier Madrigal Audio Laboratories Inc WARNING TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN CAUTION TO REDUCE THE RISK OF ELECTRICAL SHOCK DO NOT REMOVE COVER NO USER SERVICEABLE PARTS INSIDE REFER SERVICING TO QUALIFIED PERSONNEL The lightning flash with arrowhead symbol within an equilateral triangle is intended to alert the user to the presence of uninsulated dangerous voltage within the product s enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance servicing instructions in the literature accompanying the appliance Important safety instructions Please read all instructions and precautions carefully and completely before operating your N 28 Preamplifier 1 ALWAYS disconnect your entire system from the AC mains before connecting or disconnecting any cables or when cleaning any component 2 This product is equipped with a three conductor AC mains power cord which includes an earth ground connection To prevent shock hazard all three connections must ALWAYS be used If your electrical outlets will not accept this type of plug an adapter may be purchased If an adapte
9. Recommended capacitance value C Tonearm capacitance including leads C Preamplifier inherent shunt capacitance Low gain phono option 100pf high gain phono option 1000pf Note We recommend high quality polypropylene polystyrene or Teflon capacitors see your Mark Levinson dealer 1 Make sure all associated equipment is disconnected from the AC mains and that the PLS 228 is disconnected from the AC mains 2 Using a 5 64 Allen key remove the eight 6 32 flat head socket cap screws securing the N 28 s top cover Carefully lift the top cover and remove it 1 2 3 4 Cartridge loading right channel Phono gain LL q i right channel OFF NE Can I ad pins Le se e COMM se FRS ee e eo c n i g M 1 Cartridge loading left channel Phono gain left channel Ha Optional load pins o Line gain t UM Y Y M 3 Adjust the gain switches using a ballpoint pen or similar instrument and install optional loads as desired 4 Reassemble the N 28 Power connection and system activation AC power cord polarity Be sure all associated equipment is disconnected from the AC mains After making all signal connections and internal adjustments connect the ten pin DC cable from the rear panel of the PLS 228 to the connector on the rear panel of the N 28 Connect the AC cord to the ma
10. ignal ground Pin 2 Signal non inverting Pin 3 Signal inverting Connector ground lug chassis ground Refer to your power amplifiers operating manual to verify that the pin assignments of its input connector correspond to the N 28 If not wire the cable so that the appropriate output pin connects to the equivalent input pin Unpacking Placement Ventilation PRECAUTION Unpacking and placement Unpack your N 28 Preamplifier and keep all packing materials for future transport Locate and remove all accessory items from the cartons Carefully inspect the product for damage and flaws If you find any see your Mark Levinson dealer immediately Place the N 28 as close as possible to the source equipment thus keeping interconnect cabling as short as possible It may be placed on a shelf or in a cabinet where it s convenient to operate A two meter DC cable is provided to connect the PLS 228 to the N 28 This allows you to place the PLS 228 so that it won t induce hum in the N 28 and other sensitive components Other associated equipment should also be placed so that it doesn t induce hum in the N 28 and other sensitive components Be sure to allow 3 to 4 inches of clearance above both the N 28 and the PLS 228 to allow heat dissipation through air circulation Mechanical drawings are included in this manual to facilitate special installations and custom cabinet work see Dimensions For your protection re
11. ings via two single pole miniature rocker switches one for each channel The high gain and low gain phono options have been factory adjusted at the lowest gain settings 58dB and 38dB respectively If you wish to increase the gain see Making the internal adjustments refer to the tables below for the proper switch positions for each gain settings Switch 1 2 Gain Nominal Cartridge Output 3 54 cm sec On Off 58dB 2mV mV Off On 64dB 2mV and Lower Switch 1 2 Gain Nominal Cartridge Output 3 54 cm sec On Off 38dB Greater than 2 0mV Off On 44dB 2 0mV and Lower Internal adjustments cartridge loading Cartridge loading settings high gain option Cartridge loading settings low gain option Internal adjustments optional load terminals Terminating the optional load The high gain and low gain phono options offer internally selectable cartridge loading via four single pole miniature rocker switches one for each channel The high gain and low gain options have been factory adjusted at 825Q and 47KQ respectively If you wish to change the factory adjusted cartridge loading see Making the internal adjustments refer to the table below for the proper switch positions for each load setting Switch 30Q 1000 8250 10KQ Optional 1 On Off Off Off Off 2 Off On Off Off Off 3 Off Off On Off Off 4 Off Off Off Off On Switch 825Q 10KQ 22KQ A7KQ Optional 1 On Off Off Off Off 2 Off
12. le IEC connector on the rear panel of the PLS 228 then connect the AC cord to the AC mains To PLS 228 To AC mains 4 1 Line hot 2 Neutral 3 Earth ground The LED on the PLS 228 will light after about five seconds the LED on the N 28 will flash After the LED begins flashing turn the OUTPUT LEVEL knob on the front panel of the N 28 to its lowest OFF position the LED will stop flashing Allow the N 28 s circuitry to stabilize for 1 to 2 minutes then connect all associated equipment to the AC mains and activate it For optimal sonic performance and longevity the N 28 PLS 228 is designed to remain powered at all times a power on power off switch isn t provided Note If AC mains power to the N 28 is interrupted the main output will be muted When power is restored the main output will remain muted and the LED will flash until the OUTPUT LEVEL knob is turned to its lowest OFF position the LED will stop flashing Allow the preamplifier circuitry to stabilize for 1 to 2 minutes the OUTPUT LEVEL control will then function normally 10 Care and maintenance To remove dust from the cabinet of the N 28 use a feather duster To remove dirt and fingerprints we recommend isopropyl alcohol and a soft cloth Specifications The correlation between published specifications and sonic quality is unreliable A list of numbers reveals virtually nothing All technical measurements must
13. nt evened awed dti EER 2 Unpacking and placement sise 4 ER o ee Ale SR A E D Cr 4 molem E 4 i es E TM 4 Voltage Selection ee tinte tinere nnt 5 PLS 228 bottom panel label sss 5 Set up and installation ss 6 Connectors and SABES to e mtt rete reete tua npa 6 Internal adjustments line gain s 6 Line gainsellings s en td n rede d gd bes 6 Internal adjustments phono gain Rs 6 Phono gain settings high gain OPTION sse 6 Phono gain settings low gain OPTION assesses 6 Internal adjustments cartridge loading 7 Cartridge loading settings high gain OPTION seisseen 7 Cartridge loading settings low gain option 7 Internal adjustments optional load terminals sssses 7 Terminating the optional load 7 Internal adjustments varying the input capacitance 8 Making the internal adjustments eiieriereris 8 N 28 internal adjustments sene 8 Power connection and system activation 9 AC power cord polarity ins 9 Care and maintenance eeeseeseeeseeeeeeeeeen ener nnne 10 Specifications ii reete eee cct ANE Ll uiv ce cte d deer x Clg iain 11 PROMO SSCTION ME MR EE 11 UNESCON ass re nn nn pce ide pres it t rr Rees yr REESE ee 11 IIIa MERE 12 Dimensions N 28 top view seen 12 Dimensions N 28 side view ees 12 Dimensions PLS 228 top view ete Rr ai 13 Dimensions PLS 228 side view enne 13 TUNER porum evnson N 28 pear I
14. ption Phono gain settings low gain option Set up and installation The N 28 incorporates RCA type and XLR type connectors for audio signal inout and output The Madrigal designed RCA type connectors used for single ended audio interconnection are a great improvement over ordinary RCA type connectors The gold plated XLR type connectors employed are of European design and are made to professional application standards When connecting the N 28 to source equipment and power amplifiers we recommend Madrigal Audio Laboratories HPC Interconnect Cable HPC is available in various lengths terminated with RCA XLR and Camac connectors See your Mark Levinson dealer for more information The N 28 offers internal gain adjustment of the line amplifiers in 6dB steps via two single pole miniature rocker switches These switches have been factory adjusted at 6dB single ended and 12dB balanced operation In practice you should have enough gain so that normal listening is possible with the OUTPUT LEVEL set at approximately 6 If you wish to increase the line gain see Making the internal adjustments refer to the table below for the proper switch positions for each gain setting Switch Gain 1 2 Single Ended Output Balanced Output Off Off 18dB 24dB Off On 12dB 18dB On Off 6dB 12dB On On OdB dB The N 28 is available with either a high gain or low gain phono option Each option offers two internally adjustable gain sett
15. r is necessary be sure it is an approved type and is used properly supplying an earth ground If you are not sure of the integrity of your home electrical system contact a licensed electrician for assistance 3 AC extension cords are not recommended for use with this product If an extension cord must be used be sure it is an approved type and has sufficient current carrying capacity to power this product 4 NEVER use flammable or combustible chemicals for cleaning audio components 5 NEVER operate this product with any covers removed 6 NEVER wet the inside of this product with any liquid 7 NEVER pour or spill liquids directly onto this unit 8 NEVER block air flow through ventilation slots or heatsinks 9 NEVER bypass any fuse 10 NEVER replace any fuse with a value or type other than those specified 11 NEVER attempt to repair this product If a problem occurs contact your Mark Levinson retailer 12 NEVER expose this product to extremely high or low temperatures 13 NEVER operate this product in an explosive atmosphere 14 ALWAYS keep electrical equipment out of the reach of children From all of us at Maarigal Audio Laboratories thank you for choosing the Mark Levinson N 28 Preamplifier A great deal of effort went into the design and construction of this precision device Used properly it will give you many years of enjoyment Table of contents Front Panel e Rear PON ls sister ne
16. view Important safety instructions before you install your N 28 PLS 228 bottom panel label Voltage selection The PLS 228 is factory set internally for 100V 120V 200V 220V or 240V AC mains operation 50 or 60Hz Make sure that the label on the bottom of the PLS 228 indicates the correct AC operating voltage for your location PLS 228 POWER SUPPLY C2 AC INPUT WARNING BEFORE ATTEMPTING TO OPERATE THIS DEVICE REFER TO OWNER S MANUAL FOR PROPER OPERATING INSTRUCTIONS AND SAFETY Volk PRECAUTIONS HAZARDOUS VOLTAGE _ voliage AVAILABLE INSIDE DISCONNECT AC indication MAINS CABLE BEFORE REMOVING COVER OPERATING VOLTAGE 90 110VAC O 210 240VAC 105 125VAC O 230 250VAC O 180 220VAC 50 60HZ 100 120VAC MAINS 2A SLO BLO 250VAC 3AB FUSES 200 240VAC 1A SLO BLO 250VAC 3AB SERIAL NO is Sons DESIGNED AND MANUFACTURED IN U S A BY MADRIGAL AUDIO LABORATORIES INC If the voltage indicated is incorrect see your Mark Levinson dealer If you wish to change the AC operating voltage of the N 28 PLS 228 see your Mark Levinson dealer The N 28 PLS 228 can be powered by a normal 15 ampere AC mains line If other devices are also powered from the same AC line their additional power consumption must be taken into account Connectors and cables Internal adjustments line gain Line gain settings Internal adjustments phono gain Phono gain settings high gain o
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