Marantz MM7055 / MM7025 5 & 2 Channel Power Amplifier User Guide
Safety Precautions
[CAUTION SYMBOL] RISK OF ELECTRIC SHOCK DO NOT OPEN
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE COVER (OR BACK). NO USER-SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE 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.
[WARNING SYMBOL] TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.
Important Safety Instructions
- Read these instructions.
- Keep these instructions.
- Heed all warnings.
- Follow all instructions.
- Do not use this apparatus near water.
- Clean only with dry cloth.
- Do not block any ventilation openings.
- Install in accordance with the manufacturer's instructions.
- Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat.
- Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and the point where they exit from the apparatus.
- Only use attachments/accessories specified by the manufacturer.
- Use only with the cart, stand, tripod, bracket, or table specified by the manufacturer, or sold with the apparatus. When a cart is used, use caution when moving the cart/ apparatus combination to avoid injury from tip-over.
- Unplug this apparatus during lightning storms or when unused for long periods of time.
- Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way, such as power-supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.
- Batteries shall not be exposed to excessive heat such as sunshine, fire or the like.
CAUTION: HOT SURFACE. DO NOT TOUCH. The top surface over the internal heat sink may become hot when operating this product continuously. Do not touch hot areas, especially around the "Hot surface mark" and the top panel.
CAUTION: To completely disconnect this product from the mains, disconnect the plug from the wall socket outlet. The mains plug is used to completely interrupt the power supply to the unit and must be within easy access by the user.
Notes on Use
- Avoid high temperatures. Allow for sufficient heat dispersion when installed in a rack.
- Handle the power cord carefully. Hold the plug when unplugging the cord.
- Keep the unit free from moisture, water, and dust.
- Unplug the power cord when not using the unit for long periods of time.
- Do not obstruct the ventilation holes.
- Do not let foreign objects into the unit.
- Do not let insecticides, benzene, and thinner come in contact with the unit.
- Never disassemble or modify the unit in any way.
- Ventilation should not be impeded by covering the ventilation openings with items, such as newspapers, tablecloths or curtains.
- Naked flame sources such as lighted candles should not be placed on the unit.
- Observe and follow local regulations regarding battery disposal.
- Do not expose the unit to dripping or splashing fluids.
- Do not place objects filled with liquids, such as vases, on the unit.
- Do not handle the mains cord with wet hands.
- When the switch is in the OFF position, the equipment is not completely switched off from MAINS.
- The equipment shall be installed near the power supply so that the power supply is easily accessible.
Features
Current feedback discrete power amp
This is equipped with a current feedback power amp that uses the complimentary push-pull circuit used in the SM-11S1 Marantz Hi-Fi power amp. This amp provides increased operating stability, and high-speed, wide ranging high-density playback. The current/voltage conversion amplification section in the latter part of the power amp is equipped with a Wilson current mirror circuit that amplifies to the high sound range with low distortion.
Improved instant power supply capability
The final stage of the power amp is equipped with the same LAPT (high efficiency power transistor) that is installed in the SM-11S1 Marantz Hi-Fi power amp, providing improved instant power supply capability. The power section is equipped with a large-sized transformer. As one of the essential parts of the power section, this unit is equipped with Marantz original 33,000 µF / 71 V×2 (MM7055), and 15,000 µF / 71 V×2 (MM7025) block condensers, which have been repeatedly tested for sound quality. These improvements to the power supply capability provide a powerful, presence-filled sound.
High sound quality design based on pure surround philosophy
Equipped with a chimney-shaped heat sink to efficiently process the heat emitted from each channel amp, and exceptionally quiet cooling fans. A high-sensitivity temperature sensor IC is used to control the cooling fans, adjusting the rotation speed to match the amount of heat generated by the amp. These components provide the sound quality and low-noise you would expect at a high-end theater. In addition, this unit is designed for superb quality sound, and is equipped with high quality components such as a high-end audio condenser and film condenser throughout.
BALANCED/UNBALANCED selecting function
Depending on the desired use, input for each channel can be selected between BALANCED input and UNBALANCED input.
Remote Power Control
This unit is equipped with a remote power control function. When a Marantz AV Pretuner AV8003 or AV7005 is connected to this unit, this unit's power can be switched ON/OFF together with the AV8003 or AV7005 power supply. Connection to the AV8003 or AV7005 is a ground floating connection that prevents negative influences on sound quality as far as possible.
Other Functions
Equipped with IR flash input that supports custom installations, and DC trigger input and output terminals.
Cautions on Handling
- Before turning the power switch on: Check once again that all connections are correct and that there are no problems with the connection cables.
- Power is supplied to some of the circuitry even when the unit is set to the standby mode. When going on vacation or leaving home for long periods of time, be sure to unplug the power cord from the power outlet.
- About condensation: If there is a major difference in temperature between the inside of the unit and the surroundings, condensation (dew) may form on the operating parts inside the unit, causing the unit not to operate properly. If this happens, let the unit sit for an hour or two with the power turned off and wait until there is little difference in temperature before using the unit.
- Cautions on using mobile phones: Using a mobile phone near this unit may result in noise. If that occurs, move the mobile phone away from this unit when it is in use.
- Moving the unit: Turn off the power and unplug the power cord from the power outlet. Next, disconnect the connection cables to other system units before moving the unit.
- About Care:
- Wipe the cabinet and control panel clean with a soft cloth.
- Follow the instructions when using a chemical cleaner.
- Benzene, paint thinner or other organic solvents as well as insecticide may cause material changes and discoloration if brought into contact with the unit, and should therefore not be used.
Part Names
Front panel
For buttons not explained here, see the page indicated in parentheses ( ).
MM7055
Diagram Description: Front panel of the Marantz MM7055 amplifier, displaying the power switch (1), STANDBY indicator (2), illumination lamp (3), protection indicator (4), auto power off indicator (5), power indicator (6), and DISPLAY button (7). The MM7025 front panel is similar, with the same numbered components.
MM7025
Diagram Description: Front panel of MM7025 showing controls. Numbered components are: 1. Power switch (ON/STANDBY), 2. STANDBY indicator, 3. Illumination lamp, 4. Protection indicator (PROTECT), 5. Auto power off indicator (A.P.OFF), 6. Power indicator, 7. DISPLAY button.
Rear panel
See the page indicated in parentheses ( ).
MM7055
Diagram Description: Rear panel of MM7055 showing input/output connectors. Numbered components are: 1. RCA input connectors (UNBALANCED), 2. XLR input connectors (BALANCED), 3. Input selector, 4. Speaker terminals (SPEAKER SYSTEMS), 5. Flasher input terminals (FLASHER IN), 6. DC CONTROL jacks, 7. REMOTE CONTROL connectors, 8. AC inlet (AC IN).
MM7025
Diagram Description: Rear panel of MM7025 showing input/output connectors. Numbered components are: 1. RCA input connectors (UNBALANCED), 2. XLR input connectors (BALANCED), 3. Input selector, 4. Speaker terminals (SPEAKER SYSTEMS), 5. Flasher input terminals (FLASHER IN), 6. DC CONTROL jacks, 7. REMOTE CONTROL connectors, 8. AC inlet (AC IN).
Connections
NOTE: Do not plug in the power cord until all connections have been completed. When making connections, also refer to the operating instructions of the other components being connected. Check the channel, and then connect correctly. Do not bundle power cords together with connection cables. Doing so can result in noise.
Preparations
Cables used for connections
Prepare the correct cables for use with the additional devices.
- Balanced connections (XLR): Audio cables, Balanced cable
- Unbalanced connections (RCA): Audio cable
- Speaker connections: Speaker cable
XLR connector PIN arrangement
The PIN arrangement in this device uses the European method. In the USA method, the second pin is COLD, and the third pin is HOT. When connecting a device that utilizes the USA type of PIN arrangement, replace the 2 and 3 plugs on one side of the balanced cable.
NOTE: Do not short the HOT and GND or COLD and GND for use.
XLR PINs: 1 GND (Ground), 2 HOT (Hot), 3 COLD (Cold)
Speaker connections
Carefully check the channels of the speakers to be connected to this unit (L/R/SL/SR/C) and + (red), - (black), and connect like poles together.
Connecting the speaker cables
Peel off about 10 mm of sheathing from the tip of the speaker cable, then either twist the core wire tightly or terminate it.
NOTE: Connect so that the speaker cable core wires do not protrude from the speaker terminal. The protection circuit may be activated if the core wires touch the rear panel or if the + and - sides touch each other (page 10 "Protection circuit"). Never touch the speaker terminals while the power supply is connected. Doing so could result in electric shock. Use speakers with impedance of 6 ohms or more.
Sets the connected input connectors
Switches the input settings used for input to each channel.
- BALANCED: Set when connected to the XLR connector.
- UNBALANCED: Set when connected to the RCA connector.
NOTE: If audio is input into input connectors that are not set using the input switching switch, the audio will not be output from the speakers.
Example connection variation
Connection to an AV pre-tuner
Diagram Description: Shows connection examples for 5.1ch, 7.1ch, 9.1ch surround playback, and ZONE2 playback using MM7055 and MM7025 with an AV pre-tuner (AV7005). Includes speaker configuration labels like FL, C, FR, SL, SR, SBL, SBR, FHL, FHR, Z2.
Connection to an AV receiver
Diagram Description: Shows upgrading front speakers by connecting the amplifier to an AV receiver (SR7005) with pre-out output.
Connection to a 2ch pre-amp
Diagram Description: Shows a 2ch playback setup using MM7025 with a 2ch pre-amp.
Speaker Configuration Legend: FL (Front speaker L), FR (Front speaker R), Z2 (Zone2 speaker), C (Center speaker), SW (Subwoofer), SL (Surround speaker L), SR (Surround speaker R), SBL (Surround back speaker L), SBR (Surround back speaker R), FHL (Front height speaker L), FHR (Front height speaker R).
Connecting the Power Cord
Wait until all connections have been completed before connecting the power cord.
Diagram Description: Shows connecting the power cord to the AC IN on MM7055 and MM7025, leading to a household power outlet (AC 230 V, 50 Hz).
NOTE: Insert the plugs securely. Loose connections will result in the generation of noise. During power standby, a minimal amount of power is consumed. To totally cut off the power, remove the power cord from the power outlet.
Remote Control Connection
When connecting a Marantz AV8003 or AV7005 AV pre-tuner, you can switch the power of this unit to ON/STANDBY together with the AV8003/AV7005 power supply. For details, see the AV8003 or AV7005 instruction manual.
Diagram Description: Shows the remote control connection from an AV pre-tuner (AV8003/AV7005) to the REMOTE CONTROL connectors on MM7055 and MM7025.
Connection to an External Control Device
Diagram Description: Shows the external control connectors on the rear panel: 1. Flasher input connector (FLASHER IN), 2. DC control output connector (DC CONTROL OUT), 3. DC control input connector (DC CONTROL IN), 4. Remote control connector.
1 Flasher input connector (FLASHER IN)
Used when connecting a control box or other control device to this unit, and using such a device to control this unit.
2 DC control output connector (DC CONTROL OUT)
Used when connecting a device that has a DC control input terminal to this unit, and linking the power ON/STANDBY function of this device with the power ON/STANDBY of the connected device. An electrical signal of max 12 V/44 mA is output from the DC control output terminal. For details, see the instruction manual of the connected device.
NOTE: Do not use the DC control output terminal as the power supply for an external device.
3 DC control input connector (DC CONTROL IN)
Used when connecting a unit that has a DC control input terminal to this device, and linking the power ON/STANDBY of the connected device with the power ON/STANDBY of this unit. For details, see the instruction manual of the connected device.
NOTE: When a 5 V – 15 V voltage is input to the DC control input terminal, the power of this unit switches ON. However, inputting voltage outside of this range will cause damage to this unit.
4 Remote control connector
Used when connecting an external control device to this unit, and using the device to control this unit.
NOTE: When connecting a Marantz AV8003 or AV7005 AV pre-tuner, you can switch the power of this unit to ON/STANDBY together with the AV8003/ AV7005 power supply. For details, see the AV8003 or AV7005 instruction manual.
Operations
Turning the power on
When the power is in standby, press ON/STANDBY.
- The protection indicator flashes for approximately 7 seconds, and the power switches on.
- The power indicator lights.
NOTE: When turning the power ON, turn the volume control of connected devices down to the minimum.
Turning the power standby
When the power is in power on, press ON/STANDBY.
The STANDBY indicator lights, and the power changes to standby.
NOTE: Even if the unit is switched to standby, some of the circuits are still active. If you will not be using this unit for a prolonged period (due to a holiday etc), remove the power plug from the wall socket. Furthermore, to prevent unexpected accidents, make sure the power plug is located where it can be removed at any time.
Switching the illumination lamp ON/OFF
If the unit is being used with the factory settings, the illumination lamp lights. You can turn the illumination lamp off if it is making the room too bright at nighttime.
Press DISPLAY. Each time this button is pressed, the illumination lamp turns ON/OFF.
Setting the power to standby automatically (Auto standby function)
When the auto standby function is set to ON, if there are no signals input into this unit and no operations are performed for more than 30 minutes, the power of this unit automatically switches to standby.
- The factory setting is "Off".
Press DISPLAY for more than 5 seconds. The auto power off display switches as shown below according to the auto standby function.
- When the auto standby function is ON: Lit
- When the auto standby function is OFF: Off
Explanation of terms
Protection circuit
This is a function to prevent damage to components within the power supply when an abnormality such as an overload or excess voltage occurs for any reason. In this unit, the STANDBY indicator and protection indicator blinks and the unit enters standby mode when an abnormality occurs.
Speaker impedance
This is certain-rated resistance of the speaker set to an alternating current and expressed in ohms. The smaller the impedance, the greater the output. However, load on the amplifier is increased. Use speakers whose impedance is supported by this unit.
Troubleshooting
If a problem should arise, first check the following:
- Are the connections correct?
- Is the set being operated as described in the user guide?
- Are the other components operating properly?
If this unit does not operate properly, check the items listed in the table below. Should the problem persist, there may be a malfunction. In this case, disconnect the power immediately and contact your store of purchase.
| Symptom | Cause/Solution | Page |
|---|---|---|
| The power does not switch on. | Check that the power plug is inserted correctly in the wall socket. | 7 |
| Or, the power switches off immediately after being switched on. | The protective circuit has operated. In this case, remove the power plug from the wall socket, and wait for at least 1 minute before inserting it in the wall socket again. | 7, 10 |
| There is no sound from the speakers. | Check the speaker connections and connections to the other devices. Alter the input selector to match the input connector (BALANCED or UNBALANCED) of the connected device. | 6 4 |
| The power suddenly switches off during use, and the STANDBY indicator and protection indicator flash at approximately 0.5 second intervals. | The internal temperature of the unit has increased, causing the protective circuit to operate. Remove the power plug from the wall socket, wait until the temperature of the unit has dropped adequately, and then insert the power plug back into the wall socket. Install this unit in a well-ventilated location. Use speakers that have the specified impedance. | 4 4 4, 10 |
| When the power switches off suddenly during use, the STANDBY indicator flash at approximately 0.1 second intervals and protection indicator flash at approximately 0.5 second intervals. | If the two core wires of the speaker cables are touching, or if a core wire is out of the terminal causing the core wire to touch the rear panel of this unit, the protective circuit will operate. Remove the power plug from the wall socket, and firmly re-insert the core wire, or fix the terminal before reconnecting it. Turn the volume down on the amp connected to this unit, and insert the power plug again. The protective circuit has operated. In this case, remove the power plug from the wall socket, re-examine the installation conditions of this unit, and check the speaker cable connections. If the same situation occurs when the power is switched on again, contact the Marantz Service Center. | 6, 7, 10 |
Specifications
MM7055
| Specification | Value |
|---|---|
| Rated power output (from 20 Hz to 20 kHz/THD = 0.08%, two channels driven) | 140 W/ch, 8 Ω 170 W/ch, 6 Ω |
| Maximum effective output power (from 1 kHz, two channels driven) | 210 W/ch, 6 Ω |
| Output bandwidth (8 Ω load, 0.09%) | 5 Hz - 40 kHz |
| Frequency response (1 W, 8 Ω) | 8 Hz - 100 kHz (±3 dB) |
| Damping factor | 100 |
| Input sensitivity/impedance | 1.2 V / 22 kΩ (UNBALANCED) 2.4 V / 30 kΩ (BALANCED) |
| Signal-to-noise ratio (IHF-A) | 105 dB |
| Voltage amplification level | 29 dB |
| Supply voltage | AC 230 V, 50 Hz |
| Power consumption | 660 W |
| Standby power | 0.2 W |
| Maximum external dimensions | 440 (W) x 183 (H) x 384 (D) mm |
| Weight | 15.7 kg |
MM7025
| Specification | Value |
|---|---|
| Rated power output (from 20 Hz to 20 kHz, two channels driven) | 140 W/ch, 8 Ω 170 W/ch, 6 Ω |
| Maximum effective output power (from 1 kHz, two channels driven) | 210 W/ch, 6 Ω |
| Output bandwidth (8 Ω load, 0.09%) | 5 Hz - 40 kHz |
| Frequency response (1 W, 8 Ω) | 8 Hz - 100 kHz (±3 dB) |
| Damping factor | 100 |
| Input sensitivity/impedance | 1.2 V / 22 kΩ (UNBALANCED) 2.4 V / 30 kΩ (BALANCED) |
| Signal-to-noise ratio (IHF-A) | 105 dB |
| Voltage amplification level | 29 dB |
| Supply voltage | AC 230 V, 50 Hz |
| Power consumption | 330 W |
| Standby power | 0.2 W |
| Maximum external dimensions | 440 (W) x 126 (H) x 352 (D) mm |
| Weight | 10.8 kg |
For purposes of improvement, specifications and design are subject to change without notice.
Index
- Numerics
- 2ch playback: 5
- 5.1ch surround playback: 5
- 7.1ch surround playback: 5
- 9.1ch surround playback: 5
- A
- Accessories: 1
- Audio cable: 4
- Auto standby function: 9
- B
- Balanced cable: 4
- C
- Condensation: 2
- Connection
- Power cord: 7
- Connections
- Balanced: 6
- External control device: 8
- Power cord: 7
- Remote control: 7
- Unbalanced: 6
- E
- Example connection variation: 5
- F
- For expanding to front height speakers or front wide speakers: 5
- Front panel: 3
- Front speaker upgrade: 5
- P
- Protection circuit: 10
- R
- Rear panel: 3
- S
- Speaker cable: 4
- Speaker impedance: 10
- Switches the connected input connectors: 4
- Switching the illumination lamp ON/OFF: 9
- T
- Troubleshooting: 10
- Turning the Power On: 9
- Turning the power standby: 9
- X
- XLR connector PIN arrangement: 4
Dimensions
Diagram Description: Provides detailed external dimensions for the Marantz MM7055 and MM7025 amplifiers in millimeters and inches. For the MM7055: 440.0 mm (17 3/8 in) width, 183.0 mm (7 1/4 in) height, 384.0 mm (15 1/8 in) depth. For the MM7025: 440.0 mm (17 3/8 in) width, 126.0 mm (5 in) height, 352.0 mm (13 7/8 in) depth. Key measurements like front panel height and rear panel depth are also indicated.
