MQ90S - Subwoofer RCF - Free user manual and instructions

Product Type	Compact band-pass subwoofer
Woofer Size	8 inches
Frequency Response (-10 dB)	70 Hz – 220 Hz
Internal Low-Pass Filter	200 Hz, 12 dB/octave
Sensitivity (1W/1m)	89 dB
Maximum SPL (60W/1m)	107 dB
Nominal Power	60 W (100 V, 16 Ω) / 30 W (70 V)
Input Voltage	100 V / 70.7 V
Impedance Settings	16 Ω (bypass), 167 Ω, 333 Ω, 667 Ω, 1.3 kΩ
Power Taps (100V)	60 W, 30 W, 15 W, 7.5 W
Power Taps (70V)	30 W, 15 W, 7.5 W, 3.75 W
Input Connector	Removable 4-pole Euroblock
Wire Section	0.5 – 4 mm²
Enclosure Material	MDF with scratch-resistant finish
Use	Indoor only
Dimensions (W x H x D)	203 x 300 x 400 mm
Weight	8 kg
Color	Black (MQ90S-B)
Safety Features	Overload protection, high voltage warning, certified installation required

Frequently Asked Questions - MQ90S RCF

What is the RCF MQ90S subwoofer used for?

The MQ90S is a compact band-pass subwoofer designed for low-frequency reinforcement in indoor environments. It adds deep bass to existing satellite speaker systems.

How do I connect the MQ90S to a 100V or 70V line?

Use a screwdriver to set the power selector to the desired tap (e.g., 60W for 100V). Connect the amplifier’s positive wire to the + input and negative to the - input on the Euroblock connector. Ensure the line is switched off during connection.

Can I use the MQ90S in a low-impedance system?

Yes. Set the selector to the 16 Ω position. Connect the amplifier’s output to the subwoofer’s input, ensuring the total impedance is not lower than the amplifier’s output impedance.

How do I select the correct power tap?

Choose a tap so that the sum of all connected subwoofer power taps does not exceed the amplifier’s power. For a 100V line, available taps are 60W, 30W, 15W, and 7.5W. For 70V, use 30W, 15W, 7.5W, or 3.75W.

Can I daisy-chain multiple MQ90S subwoofers?

Yes. The Euroblock connector has two pairs of + and - terminals. Use the second pair to parallel-connect other loudspeakers or subwoofers, maintaining correct polarity.

What is the frequency range of the MQ90S?

The subwoofer reproduces frequencies from 70 Hz to 220 Hz (-10 dB). It includes an internal low-pass filter at 200 Hz with a 12 dB/octave slope.

Where should I place the MQ90S?

Place it on the floor in a room where satellite speakers are already installed. It is designed for indoor use only and should not be exposed to rain or humidity.

What safety precautions should I follow?

Always disconnect the amplifier before making connections. Do not expose the subwoofer to moisture or dust. Use only qualified installers for permanent installations. Avoid prolonged exposure to high sound levels.

How do I clean the MQ90S?

Clean the exterior with a dry cloth. Do not use solvents, alcohol, benzene, or other volatile substances. Avoid getting liquids inside the unit.

What are the dimensions and weight of the MQ90S?

Dimensions: 203 x 300 x 400 mm (WxHxD). Weight: 8 kg.

USER MANUAL MQ90S RCF

Before connecting and using this product, please read this instruction manual carefully and keep it on hand for future reference. The manual is to be considered an integral part of this product and must accompany it when it changes ownership as a reference for correct installation and use as well as for the safety precautions.

RCF S.p.A. will not assume any responsibility for the incorrect installation and / or use of this product.

WARNING: To prevent the risk of fire or electric shock, never expose this loudspeaker to rain or humidity and dust, but the case this has been expressly designed and made to get a suitable IP protection grade (indicated in the product specifications).

SAFETY PRECAUTIONS

1. All the precautions, in particular the safety ones, must be read with special attention, as they provide important information.
2. Loudspeaker lines (amplifier outputs) can have a sufficiently high voltage (i.e. 100 V) to involve a risk of electrocution: never install or connect this loudspeaker when the line is alive.
3. Make sure all connections have been made correctly and the loudspeaker input voltage (in a constant voltage system) or its impedance is suitable for the amplifier output.
4. Protect loudspeaker lines from damage; make sure they are positioned in a way that they cannot be stepped on or crushed by objects.
5. Make sure that no objects or liquids can get into this product, as this may cause a short circuit.
6. Never attempt to carry out any operations, modifications or repairs that are not expressly described in this manual.

Contact your authorized service centre or qualified personnel should any of the following occur:

• the loudspeaker does not function (or works in an anomalous way);
• the cable has been damaged;
• objects or liquids have got into the unit;

• the loudspeaker has been damaged due to heavy impacts / fire.

• Should the loudspeaker emit any strange odours or smoke, remove it from the line after having switched the amplifier off.

• Do not connect this product to any equipment or accessories not foreseen. For suspended installation, only use the dedicated anchoring points and do not try to hang this loudspeaker by using elements that are unsuitable or not specific for this purpose.

Also check the suitability of the support surface to which the product is anchored (wall, ceiling, structure, etc.), and the components used for

IMPORTANT NOTES

WARNING

attachment (screw anchors, screws, brackets not supplied by RCF etc.), which must guarantee the security of the system / installation over time, also considering, for example, the mechanical vibrations normally generated by transducers.

9. RCF S.p.A. strongly recommends this product is only installed by professional qualified installers (or specialised firms) who can ensure a correct installation and certify it according to the regulations in force.

The entire audio system must comply with the current standards and regulations regarding electrical systems.

1. There are numerous mechanical and electrical factors to be considered when installing a professional audio system (in addition to those which are strictly acoustic, such as sound pressure, angles of coverage, frequency response, etc.).

11. HEARING LOSS

Exposure to high sound levels can cause permanent hearing loss. The acoustic pressure level that leads to hearing loss is different from person to person and depends on the duration of exposure. To prevent potentially dangerous exposure to high levels of acoustic pressure, anyone who is exposed to these levels should use adequate protection devices. When a transducer capable of producing high sound levels is being used, it is therefore necessary to wear ear plugs or protective earphones.

See the technical specifications in the instruction manual for the maximum sound pressure the loudspeaker is capable of producing.

1. To ensure a correct musical reproduction, loudspeaker phase is to be respected (loudspeakers are connected respecting the amplifier polarity). This is important when loudspeakers are installed adjacent one another, for instance, in the same room.
2. To prevent inductive effects from causing hum, noise and a bad system working, loudspeaker lines should not be laid together with other electric cables (mains), microphone or line level signal cables connected to amplifier inputs.
3. The loudspeaker cable shall have wires with a suitable section (twisted, if possible, to reduce inductive effects due to surrounding electro-magnetic fields) and a sufficient electrical insulation.

OPERATING PRECAUTIONS

• Install this loudspeaker far from any heat source.
• Do not overload this product for extended periods of time.
• Never force the control elements (keys, knobs,etc.).
• Do not use solvents, alcohol, benzene or other volatile substances for cleaning the external parts of this product.
• If the speaker is used in particular cold places, drive it with a low signal for 5-10 minutes before using it at maximum power.

OPERATING PRECAUTIONS

RCF S.P.A. WOULD LIKE TO THANK YOU FOR HAVING PURCHASED THIS PRODUCT, WHICH HAS BEEN DESIGNED TO GUARANTEE RELIABILITY AND HIGH PERFORMANCE.

DESCRIPTION

MQ 90S is a compact band-pass 8" subwoofer.

It can be connected through a removable Euroblock plug that allows the parallel connection of other loudspeakers.

The cabinet material is MDF with a scratch resistant surface.

The subwoofer has internally a transformer for constant voltage lines (100 or 70 V).

The power selection is made by means of its selector.

It is for indoor use only (avoid to use it in very humid places).

It should be put on the floor of a room where "satellite" loudspeakers (for mid / high frequencies) are already present.

MQ 90S belongs to RCF Monitor Q series.

APPLICATIONS

One or more subwoofers can be added to a hall / room (where "satellite" loudspeakers are) for low frequency reinforcement, in order to make the music more pleasant.

CONNECTIONS

WARNING: loudspeaker connections should be only made by qualified and experienced personnel having the technical know-how or sufficient specific instructions to ensure that connections are made correctly in order to prevent any electrical danger.

To prevent any risk of electric shock, do not connect loudspeakers when the amplifier is switched on.

Before turning the system on, check all connections and make sure there are no accidental short circuits.

The entire sound system shall be designed and installed in compliance with the current local laws and regulations regarding electrical systems.

Set the power (by using a screwdriver) according to the loudspeaker line voltage (100 o 70 V):

$$ 6 0 \mathrm{W} - 3 0 \mathrm{W} - 1 5 \mathrm{W} - 7. 5 \mathrm{W} [ 1 0 0 \mathrm{V} ] $$

$$ 3 0 \mathrm{W} - 1 5 \mathrm{W} - 7. 5 \mathrm{W} - 3. 7 5 \mathrm{W} [ 7 0 \mathrm{V} ] $$

NOTES ABOUT CONSTANT VOLTAGE SYSTEMS

• The loudspeaker input voltage (Vd) must correspond to the amplifier output voltage (Va).
• The sum of nominal power values (Pd x n) of all loudspeakers connected to the line must not exceed the amplifier power (Pa).
• Make sure all loudspeakers are connected in phase to ensure a correct audio reproduction

LOW IMPEDANCE SETTING (16 Ω) (NOT FOR 100 / 70 V LINES)

Set the commutator (turn it clockwise by using a screwdriver) to the 16 Ω position.

NOTES ABOUT LOW IMPEDANCE CONNECTIONS

• The total loudspeaker impedance must not be lower than the amplifier output impedance.
  NOTE: A LOUDSPEAKER TOTAL IMPEDANCE EQUAL TO THE AMPLIFIER OUTPUT ONE PERMITS TO GET THE MAXIMUM DELIVERABLE POWER (BUT AN HIGHER LOUDSPEAKER IMPEDANCE ENTAILS LESS POWER).
• The total loudspeaker power shall be adequate for the maximum deliverable power of the amplifier.
• The loudspeaker line length shall be short (for long distances, it may be necessary to use cables with large cross-section wires).

INPUT CONNECTOR

Connect the line negative wire (coming from the amplifier output "0", "COM" or "-" to one of the 2 subwoofer inputs "-"

Connect the line positive wire (amplifier output: "100 V", "70 V" or "+" to one of the 2 subwoofer inputs "+".

NOTE: THE REMAINING INPUTS "+" AND "-" CAN BE USED FOR THE PARALLEL CONNECTION OF OTHER LOUDSPEAKERS / SUBWOOFERS.

OTHER NOTES

• Always use cables having wires with an adequate cross-section, considering the cable length and the total loudspeaker power.
• Loudspeaker lines must be kept separated from mains cables, microphone cables or others, in order to avoid inductive phenomena may cause hum or noises.
• Use cables with twisted wires to reduce hum caused by inductive effects due to coupling with electromagnetic fields.

TYPE	"band-pass" subwoofer
LOUDSPEAKER	8" woofer
SENSITIVITY	89 dB (1 W - 1 m)
FREQUENCY RESPONSE (-10 dB)	70 ÷ 220 Hz
INTERNAL FILTER	200 Hz (low-pass, 12 dB / oct.)
SOUND PRESSURE (60 W)	107 dB (1 m)
NOMINAL POWER	60 W (100 V, 16 Ω) / 30 W (70 V)
INPUT VOLTAGE	100 V – 70,7 V
IMPEDANCE	- 16 Ω (bypass)
	- 167 Ω (60 W – 100 V, 30 W – 70 V)
	- 333 Ω (30 W – 100 V, 15 W – 70 V)
	- 667 Ω (15 W – 100 V, 7.5 W – 70 V)
	- 1,3 kΩ (7.5 W – 100 V, 3.75 W – 70 V)

INPUT CONNECTOR removable 4 pole Euroblock

WIRE SECTION 0.5 ÷ 4 mm²

USE indoor

DIMENSIONS (W X H X D) 203 x 300 x 400 mm

COLOUR black (MQ90S-B)

WEIGHT 8 kg

AVVERTENZE PER LA SICUREZZA

IMPORTANTE

NOTE SULLA CONNESSIONE A TENSIONE COSTANTE

NOTE SULLA CONNESSIONE A BASSA IMPEDENZA

IMPEDENZA - 16 Ω (bypass)

- 167 Ω (60 W - 100 V, 30 W - 70 V)

- 333 Ω (30 W - 100 V, 15 W - 70 V)

- 667 Ω (15 W - 100 V, 7.5 W - 70 V)

- 1,3 kΩ (7,5 W - 100 V, 3,75 W - 70 V)

DIMENSIONI (L X H X P) 203 x 300 x 400 mm

COLORE nero (MQ90S-B)

PESO 8 kg

SICHERHEITSHINWEISE

WICHTIGE HINWEISE