FA2-900.5 - Receiver MB QUART - Free user manual and instructions

Product Type	5-Channel Car Audio Amplifier
Model	FA2-900.5
Brand	MB Quart
Number of Channels	5 (4 full-range + 1 subwoofer)
Peak Power Output	900 Watts
RMS Power per Channel (4 ohms)	60W x 4 + 300W x 1
RMS Power per Channel (2 ohms)	100W x 4 + 500W x 1
Frequency Response	10Hz - 30kHz
Signal-to-Noise Ratio	>100 dB
Total Harmonic Distortion	<0.05%
Input Sensitivity	200mV - 6V
Low Pass Filter	Variable 50Hz - 250Hz
High Pass Filter	Variable 50Hz - 250Hz
Subsonic Filter	15Hz - 40Hz
Bass Boost	0-12dB at 45Hz
Power Supply Voltage	10-16V DC
Dimensions (W x H x L)	10.2 x 2.0 x 16.9 inches (260 x 50 x 430 mm)
Weight	6.2 lbs (2.8 kg)
Protection Features	Thermal, Overload, Short Circuit
Cooling	Convection with heatsink
Recommended Fuse	80A

Frequently Asked Questions - FA2-900.5 MB QUART

How do I properly ground the amplifier?

Connect the ground terminal directly to a clean, unpainted metal part of the vehicle chassis, using a wire of at least 4 AWG. Keep the ground wire as short as possible (<18 inches).

Can I bridge channels for more power?

Yes, channels 1-2 and 3-4 are bridgeable. Bridged into 4 ohms yields 200W x 2, and the subwoofer channel is already mono.

What is the recommended speaker impedance?

For full-range channels, use 2-8 ohms. For the subwoofer channel, use 1-8 ohms (stable to 1 ohm).

How do I set the gain correctly?

Set the head unit volume to about 75% max, then adjust the gain until you hear distortion, then back off slightly. Use a multimeter or oscilloscope for precision.

What wire gauge should I use for power?

Minimum 4 AWG copper wire for power and ground. For speaker outputs, 16-12 AWG depending on length and power.

Does the amplifier have a remote turn-on feature?

Yes, use the REM terminal connected to the head unit's remote output or a 12V switched source.

What is the power output at 2 ohms?

RMS: 100W x 4 for full-range and 500W x 1 for the subwoofer channel.

How do I activate the low-pass filter for subwoofers?

On the subwoofer channel, set the LPF switch to ON and adjust the frequency dial (50-250 Hz) to your preference.

Can I use this amplifier with a factory head unit?

Yes, but you will need a line output converter (LOC) to convert speaker-level signals to RCA. The input sensitivity handles up to 6V.

What should I do if the amplifier goes into protect mode?

Check for short circuits on speaker wires, ensure proper ground, verify impedance is within range, and reduce gain if overheating. Let it cool down.

USER MANUAL FA2-900.5 MB QUART

Many new and factory radios require a reset code when disconnected from battery power. This is an anti-theft feature. Before unplugging power, you must determine if your radio/source unit requires a reset code. Check the operation manual for your vehicle or contact the dealer.

Power cable size and fusing

Model

Fuse Size

Cable Size

It is critical to use the proper power and ground cable. Select the size listed here for your amplifier model. Always use high quality copper cable. Visit our website for multi amp system cable recommendations.

Be sure to use the proper fuse size for each model.

FA2-400.4

External 40A

FA2-900.5

External 100A

FA2-1000.1

External 80A

FA 2-1500.1

External 100A

FA2-2000.1

Installation

Disconnect

negative battery

terminal

Place terminal in a secure position so that it won't accidentally contact the negative battery post

Run Cables

Properly route power, speaker and RCA cables through the vehicle.

Mount Amplifier

Choose a mounting location that will provide adequate air ventilation. Mount the amplifier to a secure surface. Do not mount the amplifier upside down.

Chassis Ground

The chassis ground connection is critical to the performance of the amplifier. Choose a location that is close to the amplifier. Completely scrape away the paint and use a nut and bolt if possible. DO NOT USE AN EXISTING FACTORY BOLT!

Technical line drawing of two mechanical components with bolts and a nut (no text or symbols)

Negative Power Connection

Attach the chassis ground cable to the amplifier negative terminal. It is important to make sure this connection is very tight.

Remote Turn-on Connection

Attach the remote turn on wire to the amplifier remote output of the source unit.

Positive Power Connection

Attach the main power cable to the amplifier +12V. The cable must run directly to

the battery and be properly fused and be very tight.

Signal Input Connection

Connect the RCA cables to the coordinating RCA input number that will match the speaker outputs number.

Turn on Mode

REM turn on (Remote wire turn on) when using High Level Input - DC turn on

- Signal Sense turn on

Auto-Sense Technical Guide

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NOTE - If the RCA's are plugged into the amplifier and the TURN ON MODE is in the DC ON position, the amplifier will NOT turn on. Please re-read QR document above or hire a professional installer.

Speaker Connections

Using spade terminals, connect the speaker cables to the speaker output connectors. Follow the

diagram below that best fits your speaker configuration.

Stereo

Bridged

onoblock single woofer

onoblock multiple woofers

Positive Battery Connection

Connect the power cable to the positive battery terminal. The power cable must be fused within 18 inches of the battery terminal.

Be prepared to disarm your vehicle's alarm and to enter your radio / source unit code.

Re-connect Negative Battery Terminal

Re-connect the negative battery terminal making sure it is securely tightened.

Setup Common System Setup

Input Mode

2CH-Input CH1/CH2

Output CH1/CH2/CH3/CH4 (FA2-400.4)

Output CH1/CH2/CH3/CH4/CH5 (FA2-900.5)

4CH-Input CH1/CH2/CH3/CH4

Output CH1/CH2/CH3/CH4 (FA2-400.4)

Output CH1/CH2/CH3/CH4/CH5 (P)

5CH-Input CH1/CH2/CH3/CH4/CH5

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NPUT MODE

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24

Crossover

Mode

The Crossover Mode switch sets the type

of crossover that will be active. 4 channel

models will have two switches, one for each

models will have two switches, one for each set of channels.

set of channels

[NO TEXT]

100

HPF LPF FUL

High pass

Adjustment

The HPF(high pass filter) control will limit the

output below the selected frequency. This

output below the selected frequency. This is typically used to protect midrange and hi

is typically used to protect midrange and hi frequency speakers from damage and to

frequency speakers from damage and to

①

.

40Hz 400Hz

②

.

Low pass

Adjustment

The LPF(low pass filter) control

will limit output above the selected

frequency. This is used to allow

a smooth transition to the higher

a smooth transition to the higher frequency speakers

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Bass Boost

st

The Bass Boost control will increase the

power output at 45Hz for more pronounced

base. Exercise option when using this

bass. Exercise caution when using this control. Increase the level in small amounts

control. Increase the level in small amounts until distortion is noticed, then back off a little

0dB +12dB

Remote Level

Control

Some models include a bass

remote. Avoid adjusting the bass

remote while operating vehicle

Remote while operating vehicles

Level Setting

ting

This is a critical step to insure your amplifier

is properly adjusted to match the signal

is properly adjusted to material output level of your source unit

output level of your source unit.

THIS IS NOT A VOLUME CONTROL!

1. If possible, with the source unit off, confirm that the primary volume control is turned down (counter clockwise).
2. Turn on the source unit (CD, or MP3 player). Re-confirm that the volume is turned down. Make sure the source unit controls; balance, fader, bass and treble are all set to center or "0" adjustment. Make sure that the green LED on the end of the amplifier is illuminated.
3. Play a clean musical selection of which you are very familiar. CD is preferred. Do not use radio signals for level setting. Hit play and start turning the volume of the source unit up.
4. Stop increasing the source unit volume when you reach 3/4 (about 75%) or until you hear speakers begin to slightly start producing distortion.
5. Increase the amplifier level (clockwise) until distortion is heard, then back the level down (counter clockwise) until the distortion is eliminated. Small adjustments may need to be made to balance the levels of multiple amplifiers.

Mono

4ch - Full Range

4ch - Mixed Mono

5ch

The information contained within this document is intended to offer some basic guidelines for a few of the most common installations. More complex audio systems should be installed in the next session of the building, including the first session of the building.

installed by a competent professional. Additional installation information available at www.maxxsonics.com

www.maxxsonics.com

WARRANTY

Maxxonsics, LLC. Warrants this product, to the original consumer purchaser, to be free from defects in material and workmanship for a period of one (1) year from the date of purchase. Maxxonsics, LLC. will, at it's discretion, repair or replace defective products during the warranty period. Components that prove to be defective in materials and workmanship under proper installation and use must be returned to the original authorized Maxxonsics, LLC. retailer from where it was purchased. A photocopy of the original receipt must accompany the product being issued by the manufacturer. The company is responsible for obtaining the rights of Maxxonsics, LLC. This warranty is limited to defective parts and specifically excludes any incidental or consequential damages connected therewith. To view the full warranty, please visit the website.

MB Quart products are designed and engineered in the USA by

MAXXSONICS

www.maxxsonics.com

MBQ FA2 QSG 01 - rev1

Quick Start Installation Guide

Exterior view of a black MBQUARTM audio amplifier module (no visible text or symbols on body)

FA2-400.4

FA2-900.5

FA2-1000.1

FA2-1500.1

FA2-2000.1

Congratulations on your choice of a MB Quart amplifier. This “Quick Start Installation” guide is meant to help you “hook up” and play music. For more detailed information, on system setting, speaker and subwoofer configuration and full specifications by model visit the website, https://mbquart.com/product-manuals/