PHONO/ |
CD |
|
|
|
|
|
|
5 |
TUNER |
|
|
|
|
|
4 |
6 |
|
AUX 1 |
|
MADRIGAL AUDIO LABORATORIES |
|
|
|
|||
|
|
|
|
|
|
|||
|
|
|
|
|
|
|
|
|
AUX 2 |
TAPE 1 |
|
|
|
|
3 |
|
7 |
|
|
|
|
|
|
|
||
AUX 3 |
TAPE 2 |
TAPE 1 TAPE 2 |
Nº 28 |
DEFEAT |
INPUT MONITOR |
2 |
|
8 |
|
|
|
PREAMPLIFIER |
|
|
1 |
|
9 |
|
|
|
|
|
|
|
||
|
|
|
|
|
|
|
OFF |
10 |
INPUT SELECTOR |
MONITOR SELECTOR |
|
RECORD SELECTOR |
|
OUTPUT LEVEL |
|||
1 |
2 |
3 |
4 |
Front panel
1INPUT SELECTOR
Selects one of the seven inputs: CD, TUNER, PHONO/AUX 1, AUX 2,
AUX 3, TAPE 1, or TAPE 2.
2RECORD 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 Nº28, 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.
3MONITOR SELECTOR
When the RECORD SELECTOR is in the MONITOR position, this selects between the TAPE 1 and TAPE 2 inputs.
4OUTPUT LEVEL
Adjusts volume at the main outputs.
The OUTPUT LEVEL control doesn't affect the tape outputs.
1
|
OUTPUTS |
|
|
|
|
|
INPUTS |
|
|
|
|
BALANCED MAIN |
|
POWER |
|
CD |
|
AUX 2 |
|
|
|
|
|
RIGHT |
LEFT |
|
SUPPLY |
RIGHT |
LEFT |
RIGHT |
LEFT |
|
|
|
|
|
|
|
INPUT |
PUSH |
PUSH |
PUSH |
PUSH |
|
|
|
|
|
|
|
|
|
|
|
|
||||
|
MAIN |
TAPE 1 |
TAPE 2 |
|
|
|
TAPE 1 |
TAPE 2 |
AUX 3 |
TUNER |
PHONO/ AUX 1 |
|
7 |
|
4 |
2 |
8 |
6 |
5 |
3 |
1 |
LEFT
GND
RIGHT
|
Rear panel |
|
PRECAUTION |
Disconnect all associated equipment from the AC mains BEFORE |
|
|
making any signal connections and applying power to the Nº28. |
|
|
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 Nº28 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 Nº28 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 |
AUX 3 |
|
|
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: |
PUSH
|
|
Pin 1: Signal ground |
|
2 |
1 |
Pin 2: Signal + (non-inverting) |
|
Pin 3: Signal – (inverting) |
|||
3 |
|
Connector ground lug: chassis ground
2
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 Nº28. 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 Nº28'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 RCA
(connect to source)
1 |
22-guage buss wire
|
|
Male XLR |
3 |
2 |
(connect to |
|
Nº28) |
6TAPE 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 Nº28.
7MAIN
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 Nº28.
8BALANCED MAIN
If your power amplifier is equipped with balanced input connectors, it's best to connect it to the Nº28 via these connectors, particularly if long cable lengths are required.
Connect the right-channel and left-channel BALANCED MAIN outputs of the Nº28 to the appropriate balanced inputs of the power amplifier.
The pin assignments of these XLR-type male outputs are:
Pin 1: Signal ground
1 2 Pin 2: Signal + (non-inverting)
3 Pin 3: Signal – (inverting)
Connector ground lug: chassis ground
Refer to your power amplifier's operating manual to verify that the pin assignments of its input connector correspond to the Nº28. If not, wire the cable so that the appropriate output pin connects to the equivalent input pin.
3
Unpacking and placement
Unpacking Unpack your Nº28 Preamplifier and keep all packing materials for future transport. Locate and remove all accessory items from the cartons.
Placement Carefully inspect the product for damage and flaws. If you find any, see your Mark Levinson dealer immediately.
Place the Nº28 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 Nº28. This allows you to place the PLS-228 so that it won't induce hum in the Nº28 and other sensitive components. Other associated equipment should also be placed so that it doesn't induce hum in the Nº28 and other sensitive components.
Ventilation Be sure to allow 3 to 4 inches of clearance above both the Nº28 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").
PRECAUTION For your protection, review "Important safety instructions" before you install your Nº28.
4
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
|
AC INPUT |
|
|
|
WARNING: BEFORE ATTEMPTING TO |
||
|
OPERATE THIS DEVICE, REFER TO |
||
|
OWNER'S MANUAL FOR PROPER |
||
|
OPERATING INSTRUCTIONS AND SAFETY |
||
Voltage |
PRECAUTIONS. HAZARDOUS VOLTAGE |
||
AVAILABLE INSIDE; DISCONNECT AC~ |
|||
indication |
MAINS CABLE BEFORE REMOVING COVER. |
||
|
|
OPERATING VOLTAGE: |
|
|
90 – 110VAC~ |
210 – 240VAC~ |
|
|
105 – 125VAC~ |
230 – 250VAC~ |
|
|
180 – 220VAC~ |
~50 – 60HZ |
|
|
|
100 – 120VAC~ |
|
|
MAINS |
2A SLO–BLO 250VAC 3AB |
|
|
FUSES: |
200 – 240VAC~ |
|
|
|
1A SLO–BLO 250VAC 3AB |
|
SERIAL NO.
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 Nº28/PLS-228, see your Mark Levinson dealer.
The Nº28/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.
5
Connectors and cables
Internal adjustments: line gain
Line gain settings
Internal adjustments: phono gain
Phono gain settings (high-gain option)
Phono gain settings (low-gain option)
Set-up and installation
The Nº28 incorporates RCA-type and XLR-type connectors for audio signal input and output.
The Madrigal-designed RCA-type connectors used for single-ended audio interconnection are a great improvement over ordinary RCAtype connectors. The gold-plated XLR-type connectors employed are of European design, and are made to professional application standards.
When connecting the Nº28 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 Nº28 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 |
0dB |
6dB |
|
|
|
|
The Nº28 is available with either a high-gain or low-gain phono option. Each option offers two internally adjustable gain settings via two single-pole miniature rocker switches, one for each channel. The highgain 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 - .6mV |
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 |
|
|
|
|
6
Loading...